JP2000059806A - Color calibration method for multivision system, color calibration device and multivision system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress decrease in displayable colors and to improve effect of color calibration by adjacently arranging display devices which are small in their color display characteristics and deciding a calibration value of the display characteristics of the color. SOLUTION: Plural projector units 3 to 11 are arranged in an array in which a total sum of differences in each display color among the projector units 3 to 11 adjacently arranged becomes minimum. In this case, a total sum of differences (a color difference and a difference in chromaticity) of display colors of four colors at four corners among the adjacent projector units 3 to 11. It is decided whether or not this total sum operation processing is completed with all the array combinations of the projector units 3 to 11. Moreover, an array of the projector units 3 to 11 where the difference in chromaticity becomes minimum is selected and this is decided to be an optimal array. Then, on the basis of this optimal array, rearrangement of the array of the plural projector units 3 to 11 of a multivision system is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color calibration method for a multi-vision system having a plurality of display devices, a color calibration device, and a multi-vision system. More particularly, the present invention relates to a displayable color generated by the calibration. The present invention relates to an improvement for effectively performing color calibration while suppressing a decrease.

[0002]

2. Description of the Related Art FIG. 19 is an explanatory diagram showing a configuration of a conventional multi-vision system disclosed in Japanese Patent Application Laid-Open No. 7-72817. In the figure, 27, 28,
Reference numerals 29 denote cathode-ray tubes arranged in a line with each other;
Reference numeral 2 denotes a screen unit disposed on the front of these cathode ray tubes.

Next, the operation will be described. When one video signal is input, the multi-vision system divides it into divided video signals for each image area, and divides each divided video signal into each of the cathode ray tubes 27, 28, and 2 corresponding to the image area.
Enter 9 And a plurality of cathode ray tubes 27, 28,
The plurality of divided images projected by 29 form an image on the screen unit 12, and a person on the opposite side of the screen unit 12 sees a large display image formed by the plurality of projector units based on the video information. be able to.

Japanese Patent Application Laid-Open Nos. Hei 7-239504 and Hei 7-333760 disclose cathode ray tubes 27, 28, 29 in such a multi-vision system.
A calibration method for correcting a difference in display color when a display color differs in each case is disclosed. In these calibration methods, for example, video information of a predetermined color is input to all the cathode ray tubes in a state where a plurality of cathode ray tubes 27, 28, 29 are arranged,
At this time, the display colors are detected, and the calibration values of the cathode ray tubes 27, 28, and 29 are determined so as to minimize the sum of squares of the hues and the like.

[0005]

Since the color calibration method in the conventional multi-vision system is as described above, one set of cathode ray tubes 27, 28, 29 used in one multi-vision system has any arrangement. The arrangement is performed without consideration, and the calculation of the calibration value in the array is performed. Therefore, for example, when the difference between the display colors of the plurality of cathode ray tubes 27, 28, and 29 is large, and the color is also large between a pair of display devices (for example, 27 and 28) arranged adjacent to each other, The calibration value of the display device (e.g., 28) on the matching side becomes large, and as a result, a color (displayable color) that can be displayed as a desired color based on the divided video signal in each of the CRTs 27, 28, and 29 And the range of displayable colors that can be displayed as the same display color among the plurality of cathode ray tubes 27, 28, and 29 is greatly reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and suppresses a decrease in displayable colors due to calibration even when a difference between display colors of a plurality of display devices is large. It is another object of the present invention to obtain a color calibration method, a color calibration device, and a multivision system for a multivision system that can effectively perform color calibration.

[0007]

According to a color calibration method for a multi-vision system according to the present invention, display devices having small differences in color display characteristics are arranged adjacent to each other, and each display device is arranged adjacent to each other. A calibration value of a color display characteristic is determined between the display device and the display device.

[0008] In the color calibration method of the multi-vision system according to the present invention, the calibration values of each display device are determined in order from the center side in the arrangement of a plurality of display devices.

A color calibration method for a multi-vision system according to the present invention determines a display color of each display device obtained when the same color is displayed, and a plurality of display devices are arranged adjacent to each other. The arrangement is such that the sum of the differences between the display colors is minimized.

A color calibration method for a multi-vision system according to the present invention determines a three-color display color area of each display device obtained by displaying the same three types of colors, The display color areas between the three colors are arranged from the center side in ascending order.

A color calibration method for a multi-vision system according to the present invention determines a three-color display color region of each display device obtained by displaying the same three types of colors. The display color areas between the three colors are arranged from the center side in the descending order.

A color calibration method for a multi-vision system according to the present invention determines a three-color display color area of each display device obtained by displaying the same three types of colors.
One display device having the largest sum of the common regions overlapping the three-color display regions of the other display devices is disposed at the center, and the common region with the display device is arranged from the central side in order from the largest common region. is there.

A color calibration method for a multi-vision system according to the present invention determines a calibration value for another display device based on a display color of one display device disposed at the center.

A color calibration method for a multi-vision system according to the present invention determines a calibration value of each display device so that at least three types of display colors match.

A color calibration device for a multi-vision system according to the present invention includes a test signal input circuit for inputting the same color signal to each of a plurality of display devices used in the multi-vision system, and a display color of each of the display devices. A sensor for detecting, an arrangement determining means for determining an arrangement of the plurality of display devices so that display devices having a small difference in display characteristics of colors based on the display colors are arranged adjacent to each other; And a correction value calculating means for determining a calibration value of the display characteristic between the display device and a display device arranged adjacently in the array.

A multi-vision system according to the present invention is provided with a magnifier which receives a video signal, divides the video signal into a plurality of divided video signals for each image area, and outputs the divided video signals. Provided, a plurality of display devices in which those having a small difference in color display characteristics are arranged adjacent to each other, a screen unit on which display images of the plurality of display devices are formed, and the same display unit for each of the plurality of display devices A test signal input circuit for inputting a color signal, a sensor for detecting a display color of each display device when the same color signal is input, and a calibration value of a display characteristic of a color of each display device in the array. Correction value calculating means for determining between adjacent display devices; and input of each of the divided video signals; Performs color conversion of the divided video signals based on the configuration values, the color converted divided video signal is obtained by a color processing section for output to the display device corresponding to the calibration value.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a system configuration explanatory diagram showing a configuration of a multi-vision system according to Embodiment 1 of the present invention. In the figure, reference numeral 1 denotes a magnifier which receives an analog video signal, divides this video signal into nine divided video signals for each image area, and outputs the divided video signals. , 11 which perform color conversion of the divided video signal based on a predetermined calibration value and output the divided video signal after the color conversion, receive the converted divided video signals, respectively. Projector unit (display device) for displaying an image based on the divided video signal after conversion, 12 is a screen unit on which the display images of the plurality of projector units 3,..., 11 are formed, and 13 is a plurality of projector units 3, , 11 and the screen unit 12 are formed separately, and the display colors of the respective projector units 3, ..., 11 are detected and the detected color information is output. The sensor 14 outputs a test signal of a predetermined color to each of the color processing units 2,..., And receives detection color information corresponding to the test signal. , 11
Correction value calculating means (test signal input circuit, arrangement determining means) for calculating the calibration value of the display characteristic of the color. The screen unit 12 has nine divided image areas.

In the correction value calculation means 14, reference numeral 15 denotes a color conversion coefficient calculation unit for determining the calibration value of each projector unit 3,..., 11 based on the three-color display color area. …, 1
1, each projector unit 3 based on the detected color information
, A color gamut determining section 17 for determining the three-color display color area, and a system control section 17 for controlling the output of the test signal and the operations of the color gamut determining section 16 and the color conversion coefficient calculating section 15. It is.

Next, the operation will be described. The magnifier 1 generates a plurality of divided video signals based on the video signals, and each of the divided video signals is input to each of the color processing units 2,. Each of the color processing units 2,..., 2 performs color conversion of the color information included in the divided video signal based on a preset calibration value, and outputs the color information as color-converted divided video information. Each projector unit 3,..., 11 displays an image based on the corresponding color-converted divided image information,
The plurality of divided images are formed on the screen unit 12 as one display image. Therefore, a person on the opposite side of the screen unit 12 can see a large display image formed by the plurality of projector units 3,..., 11 based on the video information.

Next, a color calibration method in the multivision system according to the first embodiment will be described.

First, a plurality of projector units 3
.., 11 in an appropriately arranged state, “red, green, blue, black”
The display colors of the projector units 3,..., 11 obtained when the test signals of the four colors are displayed are detected by the sensors. FIGS. 2 to 5 are flowcharts showing the detecting operation according to the first embodiment of the present invention.

In FIG. 2, step ST1 is a color conversion mode setting step for stopping the color conversion processing in all the color processing units 2,..., 2, and step ST2 is a test signal (0, 0) of "black" color. , 0) as a video signal to all the color processing units 2,..., 2 in a black signal input step. In step ST3, a sensor is arranged in correspondence with one projector unit 3,. 13 is a load step of loading the detected color information 13 as XYZ tristimulus values into the correction value calculation means 14, and step ST4 is a load number determination step of determining whether or not m tristimulus values have been loaded; Step ST5 is a load reset step for resetting the sensor 13 at each load, and step ST6 calculates an average value of m tristimulus values. An average value calculation step that,
Step ST7 is for one projector unit 3,.
At step 11, a single color measurement completion determination step is performed to determine whether or not the measurement of the four corners has been completed. Step ST8 is a corner completion reset step of resetting the sensor 13 every time measurement of one corner is completed. Thereby, a display color corresponding to the "black" test signal of one projector unit 3,..., 11 can be obtained.

In FIG. 3, step ST9 is a color conversion mode setting step for stopping the color conversion processing in all the color processing units 2,..., 2, and step ST10 is a "red" test signal (255, 0). , 0) as a video signal to all the color processing units 2,..., 2 to input a red signal. In step ST11, the sensor 13 is arranged in correspondence with one projector unit 3,. This is a load step of loading the detected color information of the sensor 13 as XYZ tristimulus values into the correction value calculation means 14, and step ST12 is a load number determination step of determining whether or not m tristimulus values have been loaded. , Step ST13 is a load reset step for resetting the sensor 13 every time the load is performed.
T14 is an average value calculation step for calculating an average value of m tristimulus values, and step ST15 is a monochromatic measurement for judging whether or not the measurement of the four corners is completed in one projector unit 3,. Step ST16 is a step of determining the completion of the sensor 13 every time measurement of one corner is completed.
Is a reset step at the time of completion of the corner. Thus, a display color corresponding to the "red" test signal of the one projector unit 3,..., 11 can be obtained.

In FIG. 4, step ST17 is a color conversion non-operation mode setting step for stopping the color conversion processing in all the color processing units 2,.
Is a green signal input step of inputting a “green” test signal (0, 255, 0) as a video signal to all the color processing units 2,..., 2. ,..., And 11 is a loading step of loading the detected color information of the sensor 13 as XYZ tristimulus values into the correction value calculating means 14, and step ST20 loads m tristimulus values. Is a load number determining step for determining whether or not the load is reset. Step ST21 is a load reset step for resetting the sensor 13 every time the load is performed.
T22 is an average value calculation step for calculating an average value of m tristimulus values, and step ST23 is a monochromatic measurement for judging whether or not the measurement of the four corners is completed in one projector unit 3,. Step ST24 is a step of determining the completion of the sensor 13 every time measurement of one corner is completed.
Is a reset step at the time of completion of the corner. Thus, a display color corresponding to the "green" test signal of the one projector unit 3,..., 11 can be obtained.

In FIG. 5, step ST25 is a color conversion mode setting step for stopping the color conversion processing in all the color processing sections 2,..., 2, and step ST26.
Is a blue signal input step of inputting a "blue" test signal (0, 0, 255) as a video signal to all the color processing units 2,..., 2; , 11, and is a loading step of loading the detected color information of the sensor as XYZ tristimulus values into the correction value calculating means 14. Step ST28 is to determine whether m tristimulus values have been loaded. Load number determination step of determining whether
Step ST29 is a load reset step for resetting the sensor 13 every time the load is performed.
0 is an average value calculation step for calculating an average value of m tristimulus values, and step ST31 is a monochromatic measurement for judging whether or not the measurement of the four corners is completed in one projector unit 3,. This is a completion determination step, and step ST32 is a corner completion reset step in which the sensor 13 is reset every time measurement of one corner is completed. As a result, the “blue” of the one projector unit 3,.
A display color corresponding to the color test signal can be obtained.

Step ST33 is a measurement completion judgment step for judging whether or not the measurement of the four display colors has been completed for all the projector units 3,..., 11; ,..., 11 is an individual completion reset step for resetting the sensor 13 every time measurement is completed. By performing the above operation for each of the projector units 3,..., 11, the measurement of the display colors of the four colors is completed for all the projector units 3,.

Next, each of the projector units 3,.
Are determined based on the display color information. Specifically, the projector units 3,...
A plurality of projector units 3,..., 11 are arranged in an array in which the total sum of the differences between the display colors of the eleventh display colors is minimized.

FIG. 6 is a flowchart showing the operation of determining the optimal sequence according to the first embodiment of the present invention. In the figure, step ST35 is a sum calculation step for calculating the sum of the differences (color difference, chromaticity difference) of the four colors and the display colors at the four corners between the adjacent projector units 3,..., 11, and step ST36 is the sum calculation processing. Is the projector unit 3,
, 11 is a color difference calculation completion determination step for determining whether or not all of the array combinations have been completed. Step ST37 selects an array of the projector units 3,... This is an optimal sequence selection step for determining a sequence. Then, the arrangement of the plurality of projector units 3,..., 11 of the multi-vision system is rearranged based on the optimal arrangement.

Finally, each of the projector units 3,.
The calibration values of the display characteristics of the eleven colors are determined. Specifically, one projector unit 7 located on the center side in the optimal arrangement is selected as a reference projector unit, and the projector units 3, 4, 5, 8, and around the reference projector unit 7 are selected.
Each of the four colors (red, green, blue, and black) between the projector units arranged adjacent to each other in order from 9, 8, 7, and 4 so that the same display color is obtained. The calibration values of the projector units 3,..., 11 are determined.

FIG. 7 is a flowchart showing the operation of calculating the calibration value according to the first embodiment of the present invention. In the figure, step ST38 is a reference color setting step of setting a display color of the reference projector unit 7 as a reference color when obtaining a calibration value. Step ST39 is a step of setting a plurality of colors arranged around the reference projector unit 7. , 11, and the display colors of the four colors of the projector units 3,..., 6, 8,. Determine calibration value to match display color 1
This is a circumference calibration value determination step, and step ST40 is adjacent to the outside of the plurality of projector units 3, ..., 6, 8, ..., 11 for which the calibration values have been determined in this one circumference calibration value determination step. A plurality of projector units are selected, and calibration is performed such that the display colors of the four colors of each projector unit match the display colors of the four colors of the adjacent projector units in the one-cycle calibration value determination step. This is a calibration value determination step for two rounds for determining the values, and step ST41 is a radiation calibration for calculating the calibration values of all the remaining projector units 3,..., 11 by the calibration value determination processing for each round. This is a value determination step.

FIG. 8 is an explanatory diagram of calibration correction schematically showing the relationship between three projector units and their calibration values in the calibration method according to Embodiment 1 of the present invention. In FIG., A, B, C is a schematic three-color between the display color area of each projector units respectively, A _r, "Red B _r, C _r is the respective projector units respectively (255, 0, 0) Is a red display point corresponding to a tristimulus value (display color) when a test signal of a "color" is input, and A _g , B _g , and C _g are (0, 255, 0) "green" for each projector unit. "a green display points corresponding to the tristimulus values (display color) in the case of inputting the color test _{signal, a b, B b, C} b to each projector unit of (0, 0, 255)" blue The blue display point corresponds to the tristimulus value (display color) when the test signal of the color “” is input. In this schematic diagram, an achromatic display point corresponding to a tristimulus value (display color) when a “black” test signal is input is located substantially at the center of the three-color display color area.

In such three projector units, when a projector unit having a three-color display color region of B is arranged between A and C, four projector units between adjacent projector units can be used. Since the total sum of the display color differences (color difference and chromaticity difference) at the four corners is minimized, the projector unit having the B three-color display color region is disposed at the center. Further, the calibration value of the projector unit having three color between the display color area of A, as A _r overlaps the B _r, as A _g overlaps B _g, further, so that the A _b overlaps B _b Is determined. Further, the calibration value of the projector unit having three color between the display color area of the C, as C _r overlaps the B _r, C _g
Is overlapped with B _g , and further, C _b is overlapped with B _b .

Here, the relationship between the three-color display color area and the calibration value will be described more specifically.

Here, a display device of an additive color mixture model in which the following equation 1 is satisfied will be described as an example. As shown in the equation, the color space of the display device in which the additive color mixture is established is obtained by obtaining the respective display colors by the linear sum of the XYZ tristimulus values of the three primary colors “R (red), G (green), and B (blue)”. Linear space. In the same equation, X _c , Y _c , Z _c
Are the three primary colors "R (red), G (green), B"
(Blue) "tristimulus values of the XYZ color C corresponding to the color mixture ratio _{of, X r, Y r, Z} r are the tristimulus values of the XYZ in displaying primary colors R (red), X _g , Y _g and Z _g are the primary colors G
(Green) is the tristimulus value of XYZ when displaying _Xb ,
Y _b and Z _b are XYZ tristimulus values when displaying the primary color B (blue), and α, β, and γ are scalar quantities representing the light intensity in the display color.

[0035]

(Equation 1)

Further, the light intensity α,
β and γ can be expressed as in the following Expression 2. In the equation, R _d , G _d , and B _d are R, G, and B digital input signals, and _fr (), f _g (), and f _b () are R,
Functions for calculating scalar quantities α, β, and γ representing the light intensity (luminance) from the G and B digital input signals (that is, ratios to the maximum emission luminance of each primary color alone, and values of 0 to 1). It is.

Α = _fr (R _d ) β = f _g (G _d ) Equation 2 γ = f _b (B _d )

Therefore, if the XYZ tristimulus values of the three primary colors R, G, and B are known, the digital input signal (R _d , G _d , B _d ), the XYZ tristimulus values of this color C can be calculated.

Note that the coefficients α, β, and γ are ratios between the maximum emission luminance of each primary color alone and are all values between 0 and 1. In the case of a normal CRT (cathode ray tube) monitor or projector, _fr (),
Although f _g () and f _b () are represented by higher-order functions, an optical device that can be represented by a linear function will be described in the following description for simplicity. That is, for example, if the input signal can take a digital value of 0 to 255 that can be expressed by 8 bits, the value of the input signal is simply 25
The values obtained by normalizing by dividing by 5 are the coefficients α, β,
γ. Then, in this case, the above equation 2 represents “α = R _d / 2
55, β = G _d / 255, γ = B _d / 255 ”.

In the above equation 1, a suffix n is added to each matrix element in correspondence with the n-th display device.
The matrix display of the XYZ tristimulus values of the display color of the n-th display device is expressed by the following equation 3, and the matrix display of the RGB three-primary color XYZ tristimulus values of the n-th display device is expressed by the following equation 4. When the matrix display of the ratio (scalar amount indicating the light intensity) of each primary color to the maximum emission luminance when displaying the display colors on the display device is defined as the following equation 5, the above equation 1 is represented by the following equation 6. Can be expressed as In this equation, “•” represents a matrix product (the same applies hereinafter).

[0041]

(Equation 2)

[0042]

(Equation 3)

[0043]

(Equation 4)

C _n = M _n · D _n ··· Equation 6

In the above equation (6), "M _n " represents a conversion matrix from the R, G, B digital values of the input signal to the XYZ tristimulus values of the color. And this matrix M
_n is unique to each display device when the color displayed by each display device is different even if the input signal is the same. Actually, this matrix M _n
Is generally different for each display device.

Next, a display device which can be represented as described above and a color conversion coefficient (calibration value) M _nt
The relationship with is described. As described above, the color conversion coefficient corrects the signal value input to the projector unit, and is the color finally displayed, that is, XYZ.
It is used to make the tristimulus values substantially equal. The relationship between the digital signal and the display color when such a color conversion coefficient is considered is shown in the following Expression 7. The formula is
The figure shows that the ratio (scalar amount indicating the light intensity) of each color of each primary color with respect to the maximum emission luminance alone is multiplied by a color conversion coefficient _Mnt to convert the color into a target color (target color). In the equation, C _t is the XYZ tristimulus value of the target color.

C _t = M _n · M _nt · D _n ···

Next, the color conversion coefficient (calibration value)
A method for obtaining _Mnt most efficiently and storing it in the color processing units 2,..., 2 will be described. First, consider D _n 'shown in Equation 8 below. D _n ′ in Equation 8 is a unit matrix, and as can be understood by examining the matrix elements, the first column corresponds to D _n when “red” is displayed, and the second column is “green”. corresponds to D _n in the case of displaying the "third column" is equivalent to D _n in the case of displaying the blue ", R, G, three primary colors separately display the primary colors alone when the B It is a ratio to the maximum light emission luminance. Note that f _r (R _r ), f _g (G _r ), f
_b (B _r ) is a ratio to the maximum light emission luminance when the primary color R is displayed, and _fr (R _g ), f _g (G _g ), f _b (B
_g) is the ratio to the maximum light emission luminance when displaying the primary color _{G, f r (R b)} , f g (G b), f b (B b) is to the maximum emission luminance when displaying the primary color B Ratio.

[0049]

(Equation 5)

Then, by using this equation 8, that is, by using the case where D _n ′ is a unit matrix, the XYZ tristimulus value C _t of the target color in equation 7 can be expressed as in equation 9 below. In addition, the color conversion coefficient (calibration value) _Mnt can be most simply expressed as in the following Expression 10. As is apparent from this equation modification, by detecting the three primary colors as the target colors as in the first embodiment, the color conversion coefficient (calibration value) of each display device can be efficiently obtained by the simplest equation (Equation 10). ) Can be obtained.

In equation (10), “M _n ⁻¹ ” is the inverse of the matrix M _n . Further, when the thus does not detect the maximum emission luminance of each primary color alone, it is impossible to represent the D _n as a unit matrix it is necessary to obtain the value of each element of the formula 8 in detail. In this case, the color conversion coefficient (calibration value) _Mnt is obtained by the following equation 1.
In the equation, “D _n ′ ⁻¹ ” is an inverse matrix of the matrix D _n ′.

[0052]

(Equation 6)

M _nt = M _n ⁻¹ · C _t Equation 10

M _nt = M _n ⁻¹ hC _t hD _n ′ ⁻¹ Equation 11

Next, the following equations 12 to 15 show modified equations such as equation 1 in consideration of the phenomenon of floating black. Further, the following equation 13 is obtained by using the functions f _r (), f _g (), f _{b in} equation 2.
This is a modified expression in the case where an input signal can take a value of 0 to 255 for an optical device in which () can be represented by a linear function. In addition, floating black means that the digital input signal value R =
Even if G = B = 0 is input, that is, even if black (BK) is displayed, light is actually slightly emitted due to dark current or the like.

In Expression 12, X_k, Y_k, Z_kIs dark
XYZ tristimulus values due to flow, etc., α, β, γ
A scalar quantity that can be represented by equation 13,
Y_r, Y _g, Y_bIs the maximum emission luminance of each primary color alone.
In Equation 13, R_d, G_d, B_dIs represented by 8 bits
R, G, B digital input signals
(R_d), Y (G_d), Y (B_d) Is black due to dark current etc.
The light emission luminance of each primary color alone when the floating effect is considered.
, Y_kIs due to dark current or the like when displaying black (BK)
Light emission luminance.

In addition, the light emission luminances Y (R _d ) and Y (G
_d ) and Y (B _d ) can be expressed by the following equation 14.

Further, in the case of a normal CRT monitor or projector, equation (13) is transformed into equation (15). The equation is a scalar quantity α, which represents the light intensity in the case of a CRT monitor or projector in which the light emission luminance cannot be expressed by a linear function.
It is an expression representing β and γ (ratio of each primary color to the maximum emission luminance).

Equations (13), (14) and (15) are expressed by the following equation (1).
2 are for explaining α, β, and γ. Even when the black floating phenomenon is considered, if α, β, and γ are expressed by Equation 13, as described in connection with Equation 2, “an input signal that can take digital values 0 to 255 is simply To 2
By dividing by 55 and normalizing, α, β, and γ will be considered. ”With the idea that equations (8) and (9) are used, it is possible to arrive at equation (10) for calculating a color conversion coefficient (calibration value). .

In addition, the conversion matrix M _n substituted into Equation 10 in consideration of this black floating phenomenon is expressed by Equation 16, and C _t is _expressed by Equation 1
It is shown in FIG. Expression 16 is the definition of Expression 4 in consideration of the effect of black floating due to dark current or the like, that is, the definition of the matrix display of the XYZ tristimulus values of the R, G, and B primary colors of the n-th display. In the equation, X _nk , Y _nk , and Z _nk are the X when the black (BK) is displayed on the n-th display.
YZ tristimulus values. Equation 17 is the definition of Equation 9 in consideration of the effect of black floating due to dark current or the like, that is, R,
This is a definition of a matrix display of XYZ tristimulus values of target colors of G and B primary colors, where X _tk , Y _tk , Z
_tk is the XYZ tristimulus value of the target color black.

Here, the black XYZ tristimulus values (X _tk , Y _tk , Z _tk ) of the target color are the black XYZ tristimulus values (X _nk , Y _nk , Z _nk ) of each display device. Then, the XYZ tristimulus value having the largest Y _nk is selected.

[0062]

(Equation 7)

Α = (Y (R _d ) −Y _k ) / (Y _r −Y _k ) = R _d / 255 β = (Y (G _d ) −Y _k ) / (Y _g −Y _k ) = G _d / 255 Equation 13 γ = (Y (B _d ) −Y _k ) / (Y _b −Y _k ) = B _d / 255

[0064]

(Equation 8)

[0065] _{α = (f r (R d} ) -Y k) / (Y r -Y k) β = (f g (G d) -Y k) / (Y g -Y k) ··· formula 15 γ = (f _b (B _d ) −Y _k ) / (Y _b −Y _k )

[0066]

(Equation 9)

[0067]

(Equation 10)

Next, the equation for calculating the color difference ΔE according to the first embodiment is shown in the following equation 18. In this equation, the tristimulus values of the primary colors R on adjacent sides in a certain adjacent display device are represented by (X _mr , Y _mr , Z _mr ), (X _nr , Y _nr , Z _nr ), and similarly, the XYZ The stimulation value is (X _mg , Y _mg , Z _mg )
(X _ng , Y _ng , Z _ng ), similarly, XYZ tristimulus values (X _mb , Y _mb , Z _mb ) of the primary color B, and (X _nb , Y _nb , Z _nb ).

Expression 19 below is a conversion expression that can be used to simplify the operation of Expression 18 above. According to this equation, the processing in the three-dimensional space of Expression 18 can be projected to the processing in a two-dimensional plane indicated by x, y chromaticity coordinates. However, it is an approximate expression. For example, when the XYZ tristimulus values of the representative color (primary color) R of the display device n are represented by (X _nr , Y _nr , Z _nr ), the values are expressed as chromaticity coordinates (x _nr , y _nr , z _nr). ). In addition, it can be said that this equation performs projection on a unit plane of x + y + z = 1.

Color difference ΔE _r = ((X _mr −X _nr ) ² + (Y _mr −Y _nr ) ² + (Z _mr −Z _nr ) ² ) ^1/2 Color difference ΔE _g = ((X _mg −X _ng ) ^{_{2 + (Y mg -Y ng)}} 2 + (Z mg -Z ng) 2) 1/2 color difference _{ΔE b = ((X mb -X} nb) 2 + (Y mb -Y nb) 2 + (Z mb - Z _nb) ^{2) 1/2} color difference _{ΔE = (ΔE r + ΔE g} + ΔE b) / 3 ··· equation 18

X _nr = X _nr / (X _nr + Y _nr + Z _nr ) y _nr = Y _nr / (X _nr + Y _nr + Z _nr ) Equation 19 z _nr = 1−x _nr −y _nr

As described above, according to the first embodiment, the projector units having a small difference in color display characteristics are arranged adjacent to each other, and each of the projector units 3,.
1 determines the calibration value of the color display characteristic between the projector unit and the adjacent projector unit.
Even if the difference between the display colors of the plurality of projector units 3,..., 11 is large, the difference between the display colors is small between each pair of adjacently arranged projector units. Projector units 3, ...,
The calibration values of the display characteristics of the eleven colors can be determined.

Therefore, a plurality of projector units 3
, 11, the calibration value of each of the projector units 3,..., 11 can be kept to the minimum necessary. , It is possible to suppress a decrease in colors that can be displayed as desired colors (displayable colors) based on the display, and to display the same display color among the plurality of projector units 3,. There is an effect that color calibration can be performed effectively while suppressing a decrease in the range of possible colors.

In particular, each of the projector units 3,.
1 is determined in order from the center side in the arrangement of the plurality of projector units 3,..., 11, so that the reference projector unit 7 and the projector units 3,. 8,
, 11, the cumulative increase of the calibration value can be minimized, and the projector units 3,..., 6, 8,.
Has the effect of suppressing an increase in the calibration value in, and also suppressing a decrease in the range of displayable colors that can be displayed as the same display color among the plurality of projector units 3,.

In determining the calibration value, the display color of one projector unit 7 disposed on the center side is set as the reference color to be unified in the plurality of projector units 3,. The plurality of projector units 3,
…, Together with the arrangement of 11, each projector unit 3,
, 11 can be minimized, which also reduces the range of displayable colors that can be displayed as the same display color among the plurality of projector units 3,. Is suppressed.

Further, since the calibration values of the projector units 3,..., 11 are determined so that the four types of display colors match, at least the display characteristics in the display color region between the three colors are extremely matched. There is an effect that can be. In particular, since the three primary colors "red, green, and blue" which are the display primary colors used in the projector units 3,..., 11 are selected, most of the visible light region is displayed between the three colors. This can be included in the color region, and has an effect that the color display characteristics of the multi-vision system can be made uniform over almost the entire visible light region.

In the first embodiment, an example is described in which the display colors (tristimulus values) in black (BK) are used together with the primary colors R, G, and B in consideration of the black floating phenomenon. If it is not necessary to consider the floating phenomenon, it is not necessary to display and measure black (BK).

In the first embodiment, the color difference in the XYZ tristimulus values at the four corners of each display device is calculated. However, for simplicity, the color difference in the XYZ tristimulus values at the center of each display is calculated. Good.

Embodiment 2 FIG. 9 is a flowchart showing an optimal sequence determining operation according to the second embodiment of the present invention. In the figure, step ST42 is for each projector unit 3,..., 11 for the difference between the red tristimulus value and the black tristimulus value, the difference between the green tristimulus value and the black tristimulus value, and the blue tristimulus. Is a stimulus difference calculation step for obtaining a difference (distance) between the stimulus value and the black tristimulus value.
1 is a stimulus difference calculation completion determination step for determining whether or not all the array combinations have been completed.
T44 determines the arrangement of the projector units 3,..., 11 from the center in ascending order of the root mean sum of the differences of the three tristimulus values calculated for each of the projector units 3,. This is the optimal sequence selection step. Then, based on the optimal arrangement, the plurality of projector units 3 of the multi-vision system
.., 11 are rearranged. Therefore, the plurality of projector units 3,..., 11 are arranged from the center side in the ascending order of the three-color display color area corresponding to the root mean square of the difference between the three tristimulus values. Other configurations and operations are the same as those in the first embodiment, and a description thereof will be omitted.

FIG. 10 is an explanatory diagram of calibration correction schematically showing the relationship between three projector units and their calibration values in the calibration method according to the second embodiment of the present invention. In the drawing, D is an achromatic color point common to all projector units, and _Ir1 is a difference (distance) between tristimulus values between a red display point and an achromatic color point in the projector unit in the three-color display color region of A. in and, I _r2 is the difference between the tristimulus values of red display points and the achromatic locus in the projector unit of the three-color between the display color area of the B (distance), I _r3 is the three-color between the display color area of the C The difference (distance) between the tristimulus values between the red display point and the achromatic color point in the projector unit, and _Ig1 is the tristimulus value between the green display point and the achromatic color point in the projector unit in the three-color display color region of A. a difference (distance), I _g2 is the difference between the tristimulus values of the green display points and the achromatic locus in the projector unit of the three-color between the display color area of the B (distance), I _g3 are three colors of C Green display point and no Is the difference between the tristimulus values of the color point (distance), I _b1
Is the difference between the tristimulus values of the blue display point and the achromatic locus in the projector unit of the three-color between the display color area of the A (distance), I _b2 is blue display in the projector unit of the three-color between the display color area of the B The difference (distance) between the tristimulus values of the point and the achromatic point (distance), and _Ib3 is the difference (distance) of the tristimulus values between the blue display point and the achromatic point in the projector unit in the display color region between C colors. It is. Except for this, the configuration is the same as that of FIG.

The calibration value of each projector unit is, for example, the sum of the root mean squares of the differences (distances) of the three tristimulus values of each projector unit is “B <A <C”.
If there of in the relationship, as A _r overlaps the B _r, A _g is B
so as to overlap in _g, further, as A _b overlaps B _b A
The calibration value corresponding to the projector unit is determined, and as C _r overlaps the B _r, C _g
So they overlap B _g, further, is the same as that of the first embodiment of the calibration value corresponding to the projector unit of C is determined such C _b overlaps the B _b.

Next, the method of obtaining the optimum arrangement of the display device and the color conversion coefficient according to the second embodiment will be described in detail. In the two-dimensional plane according to Equation 11 described in the first embodiment, the achromatic axis becomes one point and can be represented by two variables. When the coordinates of the achromatic axis are represented by (x ₀ , y ₀ ), the color value having the smallest saturation among the color measurement values is the color measurement value at which the distance from the achromatic point is minimum. . The equation for calculating this distance is shown in Equation 20 below.

[0083]

[Equation 11]

Then, the distance (saturation) from the achromatic point for each of the primary colors RGB of each display device is calculated by using the equation (20).
, And the display device having the smallest average value is placed at the center of the multi-vision system. Note that the primary colors RGB of this display device are the chromaticity coordinates of the target color.

As described above, according to the second embodiment, the projector units having a small difference in color display characteristics are arranged adjacent to each other, and each of the projector units 3,.
1 determines the calibration value of the color display characteristic between the projector unit and the adjacent projector unit.
Even if the difference between the display colors of the plurality of projector units 3,..., 11 is large, the difference between the display colors is small between each pair of adjacently arranged projector units. Projector units 3, ...,
The calibration values of the display characteristics of the eleven colors can be determined. Therefore, similarly to the first embodiment, even when the difference between the display colors of the plurality of projector units 3,.
1 can be suppressed to the minimum necessary, and a decrease in colors (displayable colors) that can be displayed as desired colors based on the divided video signals in each of the projector units 3,..., 11 is suppressed. The effect that color calibration can be performed effectively while suppressing a decrease in the range of displayable colors that can be displayed as the same display color among the plurality of projector units 3,. There is. Other effects are the same as those of the first embodiment.

Embodiment 3 FIG. 11 is a flowchart showing an optimal sequence determining operation according to the third embodiment of the present invention. In the figure, a step ST45 determines the arrangement of the projector units 3,..., 11 from the center in descending order of the root mean sum of the differences (distances) of the three tristimulus values calculated for each of the projector units 3,. This is an optimal sequence selection step for making this an optimal sequence. The other steps are the same as those in the second embodiment, and the same reference numerals are assigned and the description will be omitted. Then, the arrangement of the plurality of projector units 3,..., 11 of the multi-vision system is rearranged based on the optimal arrangement. Therefore,
The plurality of projector units 3,..., 11 are arranged from the center side in the descending order of the three-color display color area corresponding to the root mean square of the difference (distance) between the three tristimulus values. Other configurations and operations are the same as those in the second embodiment, and a description thereof will be omitted.

The calibration value of each projector unit is, for example, the sum of the root mean squares of the differences (distances) of the three tristimulus values of each projector unit is “B <A <C”.
If there of in the relationship, as A _r overlaps with C _r, A _g is C
so as to overlap in _g, further, as A _b overlaps C _b A
The calibration value corresponding to the projector unit is determined, and as B _r overlaps the C _r, B _g
So it overlaps the C _g, further, the calibration value B _b corresponds to B of the projector unit to overlap the C _b is determined.

Next, a method for obtaining the optimum arrangement of the display device and the color conversion coefficient according to the third embodiment will be described in detail. Distance (saturation) using equation 20 as in the second embodiment
And the display device having the largest average value is located at the center of the multi-vision system. Note that the primary colors RGB of this display device are the chromaticity coordinates of the target color.

At this time, the surrounding projector units 3 and
, 6, 8, ..., 11 are smaller than the central projector unit 7. Further, projector units 3,..., 6, 8, and 8 arranged on the periphery to match the hue with the projector unit 7 arranged on the center side.
, 11 are further narrowed. Therefore, a method for visually complementing the color reproducibility with the center projector unit 7 having the largest color reproduction range is also used. FIG. 12 is an explanatory diagram for explaining the content of the color reproduction characteristic complementing process according to the third embodiment. When the color to be displayed is within the color reproduction range, the projector unit around the narrow color reproduction area performs correction based on only the above calibration value, and when the color to be displayed is outside the color reproduction range. Indicates the color at the point where the straight line connecting the point determined by the lightness and saturation of the color and the convergent point where the lightness and saturation is “0” intersects the boundary of the color reproduction range. Select as color. Here, the determination as to whether the display color is within or outside the color reproduction range is made, for example, by determining the R in the matrix operation result.
It is determined whether the GB value exceeds the maximum value assigned to the display signal value. If the value exceeds the maximum value (in case of overflow), the display color of the projector unit having a narrow color reproduction range is changed according to the above procedure. change. This processing may be performed by the color processing unit, and information such as coefficients and tables may be generated by the color conversion coefficient calculation unit.

As described above, according to the third embodiment, projector units having a small difference in color display characteristics are arranged adjacent to each other, and each of the projector units 3,.
1 determines the calibration value of the color display characteristic between the projector unit and the adjacent projector unit.
Even if the difference between the display colors of the plurality of projector units 3,..., 11 is large, the difference between the display colors is small between each pair of adjacently arranged projector units. Projector units 3, ...,
The calibration values of the display characteristics of the eleven colors can be determined. Therefore, similarly to the second embodiment, even when the difference between the display colors of the plurality of projector units 3,.
1 can be suppressed to the minimum necessary, and a decrease in colors (displayable colors) that can be displayed as desired colors based on the divided video signals in each of the projector units 3,..., 11 is suppressed. The effect that color calibration can be performed effectively while suppressing a decrease in the range of displayable colors that can be displayed as the same display color among the plurality of projector units 3,. There is. Other effects are the same as those of the second embodiment.

Embodiment 4 FIG. 13 is a system configuration explanatory diagram showing the configuration of the multivision system according to Embodiment 4 of the present invention. In the figure, 20,..., 20 are arranged between the respective projector units 3,..., 11 and the screen unit 12 at positions that can receive the images of the respective projector units 3,. Provided individual sensors (sensors). The other configuration is the same as that of the first embodiment, and the same reference numerals are given and the description is omitted.

Next, the operation will be described. Each individual sensor 20,..., 20 has a corresponding projector unit 3,
, 11 are received outside the display image area, and detected color information is output based on the received light. The correction value calculation means 14 determines the optimum arrangement and the calibration value based on the detected color information. Other operations are the same as those in the first embodiment, and a description thereof will be omitted.

As described above, according to the fourth embodiment, the sensors 20,..., 20 for measuring the display colors of the projector units 3,.
, 11 and the screen unit 12 are provided for each of the projector units 3,..., 11, so that the light of the projector units 3,. Since the detected color information output from each of the sensors 20,..., 20 can be used as it is, there is no need for a circuit or the like for correcting the sensor output, and a compact system configuration can be achieved. .

The individual sensors 20,..., 20 are connected to the projector units 3,.
, 11 are provided for each of the projector units 3,..., 11, so that the calibration values of the multi-vision system can be maintained after shipment.

In the fourth embodiment, the first embodiment is used.
, 2 in combination with the configuration of
Although an example has been described in which 0 is provided for each of the projector units 3,..., 11, similar effects can be obtained in combination with other embodiments.

Embodiment 5 FIG. 14 is a system configuration explanatory diagram showing the configuration of the multivision system according to the fifth embodiment of the present invention. In the figure, reference numeral 18 denotes a three-color display color area between each projector unit 3,..., 11 and another projector unit based on the three-color display color area information for each projector unit 3,. A color conversion coefficient calculation unit for obtaining the sum of the common areas and obtaining the optimum arrangement based on the sum of the common areas, and 19 is the three-color display color area information of the projector units 3,. Is a memory for storing the sum information of the information. The other configuration is the same as that of FIG. 13, and the same reference numerals are given and the description is omitted.

Next, the operation will be described. FIG. 15 is a flowchart showing an optimal sequence determining operation according to the fifth embodiment of the present invention. In the figure, step ST46 is a common area sum calculation step of individually obtaining common areas with the three-color display color areas of the other projector units for each of the projector units 3,..., And calculating the sum of the common areas. In step ST47, one projector unit 7 having the largest total sum of the common areas is arranged at the center, and the arrangement arranged from the center side in order from the one having the largest common area with the projector unit 7 is set as the optimal arrangement. This is an array selection step. The other steps are the same as those in the third embodiment, and the same numbers are assigned and the explanation is omitted. Then, the arrangement of the plurality of projector units 3,..., 11 of the multi-vision system is rearranged based on the optimal arrangement. Therefore, the plurality of projector units 3,..., 11 are arranged at the center with one projector unit 7 having the largest sum of the common areas overlapping the three-color display areas of the other projector units. The common areas are arranged from the center side in order from the largest common area. Other operations are the same as those in the fourth embodiment, and a description thereof will not be repeated.

FIG. 16 is an explanatory diagram of calibration correction schematically showing the relationship between three projector units and their calibration values in the calibration method according to the fifth embodiment of the present invention. In the figure, S (AB) is a common area where the three-color display area of the A projector unit and the three-color display area of the B projector unit overlap, and S (BC) is the B projector unit. And the three-color display area of the projector unit C overlap with the three-color display area. In the figure, since the projector unit of B has the largest total of the common area, the projector unit of B is arranged at the center, and the projector units of A and C are arranged on both sides thereof. Except for this, the configuration is the same as that of FIG. 10, and the same reference numerals are given and the description is omitted.

Next, a method of obtaining a common area will be described.
As a method for obtaining the common area, there are two methods, a mathematical method and a graphic method used in the fifth embodiment.

The method of mathematically obtaining is as follows. First, a vertex of a common area is obtained from an intersection of corners of a triangle which is a color reproduction range, and then, based on a coordinate value of a vertex of a polygon of the common area. This is a method for determining the area.

The method of obtaining the figure graphically first uses a graphics method (an odd-even method or the like is conventionally used) that fills the inside of each triangle which is the color reproduction range of each target display device. Is turned on, and the area of each color reproduction range is approximated by the number of meshes as the minimum unit of graphics. Next, it can be obtained by taking the AND condition of the common area of the two triangles. The area of the resulting common region is finally the number of meshes in the ON state, and is an integer. In the case of this filled graphics method, the quantization error is determined by the roughness of the mesh, and a large-capacity memory is required to develop (map) each color reproduction range on the memory. In addition, it can also be realized using a table in which coordinate values are sorted. In other words, in a basic case where the sides do not overlap, the sides between the second and third triangles are common areas when the sides of each triangle appear alternately.

As described above, according to the fifth embodiment, the projector units having a small difference in color display characteristics are arranged adjacent to each other, and each of the projector units 3,.
1 determines the calibration value of the color display characteristic between the projector unit and the adjacent projector unit.
Even if the difference between the display colors of the plurality of projector units 3,..., 11 is large, the difference between the display colors is small between each pair of adjacently arranged projector units. Projector units 3, ...,
The calibration values of the display characteristics of the eleven colors can be determined. Therefore, similarly to the fourth embodiment, even when the difference between the display colors of the plurality of projector units 3,.
1 can be suppressed to the minimum necessary, and a decrease in colors (displayable colors) that can be displayed as desired colors based on the divided video signals in each of the projector units 3,..., 11 is suppressed. The effect that color calibration can be performed effectively while suppressing a decrease in the range of displayable colors that can be displayed as the same display color among the plurality of projector units 3,. There is. Other effects are similar to those of the fourth embodiment.

Embodiment 6 FIG. FIG. 17 is a system configuration explanatory diagram showing the configurations of a multivision system and a color calibration device according to Embodiment 6 of the present invention. In the figure, 21 is a multi-vision system having a plurality of projector units 3, ..., 11; 22 is a sensor unit provided with the same number of sensors 22a, 22b, 22c as the projector units 3, ..., 11 arranged in each row; Reference numeral 23 denotes a color calibration apparatus main body (test signal input circuit, arrangement determining means), and reference numeral 24 denotes an interface unit that outputs a test signal of a predetermined color to each color processing unit of the multi-vision system under the control of the system control unit 17. It is. Other configurations are the same as those in FIG. 1, and the same reference numerals are given and the description is omitted.

Next, the operation will be described. From the interface unit 24, each color processing unit 2,
, 2, the sensor unit 22 is automatically moved in the column direction at a position facing the screen unit 12 of the multi-vision system while a test signal of a predetermined color is output to the. The color calibration device main body 23 receives the detected color information corresponding to each of the projector units 3,..., 11 output from the sensor unit 22, and determines the optimum arrangement and the calibration value based on the detected color information. decide. Other operations are the same as those in the first embodiment, and a description thereof will be omitted.

As described above, according to the sixth embodiment, the sensors 22a, 22b, and 22c and the color gamut determining section 1
6. Since the color conversion coefficient calculation unit 18 and the like are formed as a separate color calibration device from the multi-vision system 21, the multi-vision system 21 having a small size and excellent portability can be provided by separating these components. There is an effect that the color calibration can be performed effectively while configuring, and while suppressing the decrease in the range of the displayable color of the multi-vision system 21.

In the sixth embodiment, the first embodiment is used.
Although the example in which the color calibration device is formed separately on the premise of the configuration described above has been described, similar effects can be obtained also on the premise of the configuration of the other embodiments.

Further, in the sixth embodiment, since the sensor unit has the same number of sensors as the number of display devices in the row direction, the moving direction is only the column direction, but only one sensor is mounted on the sensor unit. The sensor unit may be moved in the row direction and the column direction. Further, the sensor may be adapted to all projector units.

Embodiment 7 FIG. FIG. 18 is a system configuration explanatory diagram showing the configurations of a multivision system and a color calibration device according to Embodiment 7 of the present invention. In the figure, reference numeral 25 denotes a display device that displays information generated by the color calibration device main body 23, and 26 denotes a pointing device that outputs a processing command to the color calibration device main body 23 based on the information displayed on the display device 25. It is. Structures other than the above are the same as those in FIG. 17, and the same reference numerals are given and the description is omitted.

Next, the operation will be described. Display device 25
Is selected using the pointing device 26 from the menu displayed in
The test signal output from the interface unit 24 is started. When the calibration operation conditions are set using the pointing device 26 according to the display image of the display device 25, the sensor unit 22 moves to face the screen unit 12 of the multi-vision system 21, and the color calibration device main body is moved. 23 determines an optimal arrangement and a calibration value based on the detected color information output from the sensor unit 22. Other operations are the same as those in the sixth embodiment, and a description thereof will be omitted.

As described above, according to the seventh embodiment, the display device 25 and the pointing device 26 are provided in the color calibration apparatus, and thereby the color calibration processing command and the calibration operation conditions are set. Therefore, the calibration operation of the multi-vision system 21 is changed, for example, the display colors of the plurality of projector units 3,..., 11 are changed, and the number of measurements (m) in the display colors is set to a minimum necessary value. Or the target color can be set arbitrarily.

[0111]

As described above, according to the present invention, display devices having a small difference in color display characteristics are arranged adjacent to each other, and each display device has a color difference between the adjacent display devices. Since the calibration value of the display characteristics is determined, even if the difference between the display colors of a plurality of display devices is large, the difference between the display colors is small between each pair of display devices arranged adjacently. Thus, the calibration value of the display characteristic of the color of each display device can be determined in the arrangement state. Therefore, even when the difference between the display colors of the plurality of display devices is large, the calibration value of each display device can be suppressed to a necessary minimum, and each display device can set a desired color based on the divided video signal. It is possible to suppress a decrease in the colors that can be displayed (displayable colors), and to reduce the range of the displayable colors that can be displayed as the same display color among a plurality of display devices. There is an effect that color calibration can be performed in a specific manner.

In particular, by determining the calibration value of each display device in order from the center side in the arrangement of a plurality of display devices, the calibration value between the reference display device and the display devices arranged in the peripheral portion is determined. It is possible to minimize the cumulative increase in the value, suppress the increase in the calibration value in the display devices arranged in the periphery, and display the same display color among a plurality of display devices. There is an effect that a reduction in the range of possible displayable colors can be suppressed.

As a method of determining the arrangement of a plurality of display devices, for example, the display color of each display device obtained when the same color is displayed is determined, and the plurality of display devices are placed adjacent to each other. Even if the display devices are arranged in an array in which the sum of the display color differences between the display devices arranged in the
In addition to determining the three-color display color region of each display device obtained by displaying different types of colors, a plurality of display devices are arranged from the center side in the ascending order of the three-color display color regions. Also, while determining the three-color display color region of each display device obtained by displaying the same three types of colors, a plurality of display devices are arranged from the center side in the descending order of the three-color display color region. In addition to determining the three-color display color area of each display device obtained by displaying the same three types of colors, the plurality of display devices may be arranged in three colors of another display device. One display device having the largest sum of common areas overlapping the inter-display area is disposed at the center, and the common area with the display device is large. It may be disposed from the center side in order from the.

In determining the calibration value, any reference color to be unified in a plurality of display devices may be assumed to be any color. However, it is only necessary to make the display characteristics of the colors of a plurality of display devices in a multi-vision system uniform. For the purpose, for example, the display color of one display device disposed on the center side may be set as the reference color. In this case, in combination with the arrangement of the plurality of display devices, the calibration value of each display device can be minimized.

Further, the reference color is not limited to one color. For example, the calibration value of each display device can be determined so that at least three types of display colors match. By determining the calibration value of each display device so that at least three types of display colors match, display characteristics in at least the three-color display color region surrounded by these three types of display colors are determined. There is an effect that it can be made to be extremely matched. Therefore, in particular, by selecting “red, green, and blue” which are the three primary colors used in the display device as these three display colors, the displayable most portion of the display device is displayed in the three-color display color area. And the color display characteristics of the multi-vision system can be made uniform over almost the entire displayable area of the display device.

According to the present invention, a test signal input circuit for inputting the same color signal to each of a plurality of display devices used in a multi-vision system, a sensor for detecting a display color of each of the display devices, Array determining means for determining the arrangement of the plurality of display devices so that display devices having a small difference in color display characteristics are arranged adjacent to each other based on Correction value calculation means for determining between adjacent display devices in the array, so that display devices having a small difference in color display characteristics are arranged adjacent to each other based on this array information. Even if the difference between the display colors of a plurality of display devices is large, the calibration of each display device Effective color calibration while minimizing the range of possible display colors that can be displayed as the same display color among multiple display devices. There is an effect that can be.

According to the present invention, a video signal is input,
An expander that divides this video signal into a plurality of divided video signals for each image area and outputs the divided video signals, and a magnifier that is provided corresponding to each of the divided video signals and that has a small difference in color display characteristics is arranged adjacent to each other. A plurality of display devices, a screen unit on which display images of the plurality of display devices are formed, a test signal input circuit for inputting the same color signal to each of the plurality of display devices, and the same color signal being input. A sensor for detecting a display color of each display device when the correction is performed, and a correction value calculating means for determining a calibration value of a display characteristic of a color of each display device between display devices arranged adjacent to each other in the array. And each of the divided video signals is input, and performs color conversion on the divided video signal based on each of the calibration values. A color processing unit that outputs an image signal to a display device corresponding to the calibration value, so that a calibration value for each display device is required even when a difference between display colors of a plurality of display devices is large. It is possible to minimize the range of displayable colors that can be displayed as the same display color among a plurality of display devices while minimizing the range, and to effectively perform color calibration. is there.

[Brief description of the drawings]

FIG. 1 is a system configuration explanatory diagram showing a configuration of a multi-vision system according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a detection operation according to the first embodiment of the present invention (part 1).

FIG. 3 is a flowchart illustrating a detection operation according to the first embodiment of the present invention (part 2).

FIG. 4 is a flowchart illustrating a detection operation according to the first embodiment of the present invention (part 3).

FIG. 5 is a flowchart illustrating a detection operation according to the first embodiment of the present invention (part 4).

FIG. 6 is a flowchart showing an optimal sequence determining operation according to the first embodiment of the present invention.

FIG. 7 is a flowchart showing an operation of calculating a calibration value according to the first embodiment of the present invention;

FIG. 8 is a calibration correction explanatory diagram schematically showing a relationship between three projector units and their calibration values in the calibration method according to the first embodiment of the present invention.

FIG. 9 is a flowchart showing an optimal sequence determining operation according to the second embodiment of the present invention.

FIG. 10 is a calibration correction explanatory diagram schematically showing a relationship between three projector units and their calibration values in a calibration method according to Embodiment 2 of the present invention.

FIG. 11 is a flowchart showing an optimal sequence determination operation according to Embodiment 3 of the present invention.

FIG. 12 is an explanatory diagram for describing the content of a process of complementing color reproduction characteristics according to the third embodiment.

FIG. 13 is a system configuration explanatory diagram showing a configuration of a multi-vision system according to a fourth embodiment of the present invention.

FIG. 14 is a system configuration explanatory diagram showing a configuration of a multi-vision system according to a fifth embodiment of the present invention.

FIG. 15 is a flowchart showing an optimal sequence determining operation according to Embodiment 5 of the present invention.

FIG. 16 is an explanatory diagram of calibration correction schematically showing the relationship between three projector units and their calibration values in a calibration method according to Embodiment 5 of the present invention.

FIG. 17 is a system configuration explanatory diagram showing the configurations of a multivision system and a color calibration device according to a sixth embodiment of the present invention.

FIG. 18 is a system configuration explanatory diagram showing configurations of a multi-vision system and a color calibration device according to a seventh embodiment of the present invention.

FIG. 19 is a system configuration explanatory diagram showing the configuration of a conventional multi-vision system.

[Explanation of symbols]

1 magnifier, 2 color processing unit, 3, 4, ..., 11 projector unit (display device), 12 screen unit, 13, 22a, 22b, 22c sensor, 1
4 Correction value calculation means (test signal input circuit, arrangement determination means), 20 individual sensors (sensors), 23 main body of color calibration apparatus (test signal input circuit, arrangement determination means).

Claims (10)

[Claims] 1. A color calibration method for a multi-vision system comprising a plurality of display devices, wherein display devices having a small difference in color display characteristics are arranged adjacent to each other, and each display device is arranged adjacent to each other. A color display characteristic calibration value is determined between the two. 2. The color calibration method for a multi-vision system according to claim 1, wherein the calibration values of each display device are determined in order from the center in the arrangement of the plurality of display devices. 3. A display color of each display device obtained when the same color is displayed is determined, and a plurality of display devices are arranged such that a total sum of a difference between the display colors of adjacently arranged display devices is minimum. The color calibration method for a multi-vision system according to claim 1 or 2, wherein the color calibration method is arranged in an array. 4. A three-color display color region of each display device obtained by displaying the same three types of colors is determined, and a plurality of display devices are arranged in the center of the three-color display color region in ascending order. The color calibration method for a multi-vision system according to claim 1, wherein the color calibration method is arranged from a side. 5. A three-color display color region of each display device obtained by displaying the same three types of colors is determined, and a plurality of display devices are arranged in the center in the descending order of the three-color display color regions. The color calibration method for a multi-vision system according to claim 1, wherein the color calibration method is arranged from a side. 6. A display color region between three colors of each display device obtained by displaying the same three kinds of colors is determined, and a plurality of display devices overlap with a display color region between three colors of another display device. 3. The display device according to claim 1, wherein one display device having the largest sum of the common areas is arranged at the center, and the common area with the display device is arranged from the center side in ascending order. A color calibration method for multi-vision systems. 7. The multi-vision system according to claim 1, wherein a calibration value of another display device is determined based on a display color of one display device disposed on the center side. Color calibration method. 8. The color calibration method for a multi-vision system according to claim 1, wherein the calibration value of each display device is determined so that at least three types of display colors match. 9. A test signal input circuit for inputting the same color signal to each of a plurality of display devices used in a multi-vision system, a sensor for detecting a display color of each of the display devices, and a color based on the display colors. Arrangement determining means for arranging the plurality of display devices so that the display devices having a small difference in display characteristics are arranged adjacent to each other; and calibrating values of display characteristics of colors of the respective display devices in the array. A color calibration device for a multi-vision system, comprising: a correction value calculating unit that determines a correction value between the display device and a display device that is arranged. 10. A magnifier for receiving a video signal, dividing the video signal into a plurality of divided video signals for each image area, and outputting the divided video signals; and a color display characteristic provided for each of the divided video signals. A plurality of display devices in which small differences are arranged adjacent to each other; a screen unit on which display images of the plurality of display devices are formed; a test signal for inputting the same color signal to each of the plurality of display devices An input circuit, a sensor for detecting a display color of each display device when the same color signal is input, and a display in which the calibration values of the display characteristics of the colors of each display device are arranged adjacently in the array Correction value calculating means for determining between the apparatus and the apparatus, each of the divided video signals is input, and the divided video signal is input based on each of the calibration values. A multi-vision system comprising: a color processing unit that performs color conversion of an image signal and outputs the divided video signal after the color conversion to a display device corresponding to the calibration value.