CN1658651A - Color correction method for reducing color different between channel of multi-channel projection display system - Google Patents
Color correction method for reducing color different between channel of multi-channel projection display system Download PDFInfo
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Abstract
This invention relates to a color emendation method used in the multi-passage projection display system to reduce the color differences among passages, and to solve the problem of color differences of every passage projection images. The system is composed of the figure producing computer, the image regulator, the projector, the debugging computer, the color measure equipment and the projection screen. The figure producing computer, the image regulator, the projector form a projection passage. The figure producing computer produces the input images, and the projector output the projection image to the projection screen. The system has at least two projection passage. The steps of the color emendation method is as following. (1) obtain the color mapping data of the three primary colors of red, green and blue between the screen image and the testing image of every passage; (2) obtain the object mapping data of the system; (3) get the color emendation coefficient; (4) use the color emendation coefficient to process the input images.
Description
Technical field:
The present invention relates to the color correcting method of multi-channel projection display system.
Background technology:
Multichannel Projection Display display system is utilized a plurality of projecting apparatus, and the image projection that a plurality of pictcure generators or video source are produced forms a continuous unified whole picture on plane or curved surface projection curtain.The big visual field what comes into a driver's of simulators such as multi-channel projection display system is widely used for flying, boats and ships shows, and the large scale display of command and control system.
Because projector lens and bulb optics property difference, electronic component are to the multiple factor affecting such as error of color rendition, each the passage projected image on screen certainly exists heterochromia.A technical barrier of multi-channel projection display system is how to make that the projected image brightness of different projected channel on screen is even, color is consistent.At present, solve the inconsistent method of each projected channel projected image color and have two kinds: first kind is to use the projector that has colour correcting apparatus, and its colour correction is effective, but projector apparatus costs an arm and a leg, and does not have versatility; Second kind is the colour correction machine that the input picture color is adjusted, and makes the projected image color unanimity of projector's output.But prior art need be proofreaied and correct respectively brightness, color and the gray scale of image, and must use professional equipment such as chromascope, and needs the long period.
The content of invention:
The purpose of this invention is to provide a kind of method of automatically the projected image color being proofreaied and correct.The present invention can detect the difference between projected image color-values and the object color component value automatically, by adjusting the input picture color-values, to reduce the difference of each passage projected image.
The present invention is achieved in that
A kind of color correcting method that is used for reducing color different between channel of multi-channel projection display system, system is made up of pictcure generator, image rectification machine, projector, debugging computer, color measurements equipment and projection screen; Pictcure generator, image rectification machine and projector form projected channel; There are at least two projected channel in system; The color correcting method step is as follows:
(1) pictcure generator of each projected channel produces input picture, input projector after the image rectification machine is proofreaied and correct, project to projection screen, color measurements equipment obtains the color-values of screen picture, the color conversion cell of input debugging computer, obtain the color map data of each projected channel input picture color-values, deposit memory in to the screen picture color-values;
(2) debugging computer calculates the object color component mapping (enum) data of system according to the color map data of each passage, deposits memory in;
(3) debugging computer calculates the color correction coefficient of each passage, the image rectification machine uses color correction coefficient that the input picture that pictcure generator produces is proofreaied and correct, to proofread and correct back image input projector, project to screen, obtain the color map data by color measurements equipment, the difference of color map data and object color component mapping (enum) data behind the calculation correction, if the difference value of twice correction in front and back has converged in the specification error scope, then colour correction is finished; Otherwise carry out step (3) once more;
(4) color correction coefficient that step (3) is obtained deposits the image rectification machine in, and the image rectification machine uses color correction coefficient, and input picture is handled, and will proofread and correct back image input projector.
It is as follows to calculate the color map data method in the step (1): pictcure generator produces input picture, the color measurements device measuring obtains the screen picture color-values corresponding with input picture pixel color-values, use a frame or multiframe input picture, repeat above-mentioned steps, screen color value up to this projected channel that measures all input color-values correspondences, through color conversion cell, get projected channel color map data.
The method of the object color component mapping (enum) data of computing system is as follows in the step (2): debugging computer is according to the span of each passage color map data of color map data computation of each projected channel, calculate the public Color Range of all passage color map data again, deposit memory in; All projected channel color map data input average calculation unit, calculate average mapping (enum) data; With average mapping (enum) data input fitting of a polynomial unit, calculate level and smooth mapping (enum) data, result of calculation is imported linear transform unit, carry out linear transformation with the public Color Range of storing in the memory, make the data span in public Color Range, get the object color component mapping (enum) data.
The method of each passage colour correction is as follows in the step (3): debugging computer at first is provided with the color correction coefficient initial value, deposits memory in; Color map data in the debugging computer memory and object color component mapping (enum) data input subtrator, the difference input difference comparing unit that calculates, the difference of input last computation from memory, the difference of twice of front and back is compared, comparative result input color correction coefficient computing unit, if comparative result is in the specification error scope, then the gained color correction coefficient deposits image rectification machine memory in, finishes the process of calculating color correction coefficient; If comparative result outside error range, is then stored color correction coefficient to image rectification machine memory, use color correction coefficient that input picture pixel color-values is adjusted, export adjusted image to projector, proceed step (3).
In the step (4), pictcure generator produces input picture and deposits in the image rectification machine memory, image fetching unit is read the color-values of each pixel of input picture successively, be input to adder unit, with the color correction coefficient addition, obtain proofreading and correct the plain color-values of after image, by the image writing unit write memory.
The present invention goes for various projectors, and measuring process is simple.The present invention is directed to prior art and need professional equipments such as chromascope, or need special-purpose projector, the cost height, the problem that trimming process is very consuming time, coupling when having proposed to finish automatically technically to projector's brightness, color and gray scale, and can use ordinary digital camera or Digital Video as color measurements equipment.The invention process cost is low, speed is fast, and a projected channel is proofreaied and correct only needs 1-2 hour, and calibration result is good.
Description of drawings:
Fig. 1 hardware structure diagram;
Fig. 2 color measurements block diagram;
Fig. 3 main flow chart of the present invention;
Fig. 4 debugging computer block diagram 1;
Fig. 5 debugging computer block diagram 2;
Fig. 6 debugging computer block diagram 3;
Fig. 7 image rectification machine frame figure.
Embodiment:
Projected channel is by pictcure generator, image rectification machine, projector, and screen is formed the shared screen of all projected channel in the system, but an ad-hoc location of each projected channel use screen.Form by two projected channel among the present invention,, can expand to a plurality of projected channel easily, and can influence technique not implement because the present invention has extensibility.Color measurements equipment links to each other with debugging computer, and debugging computer can read the measurement color-values from color measurements equipment.As shown in Figure 1.
Debugging computer links to each other with a color measurements equipment by data transmission interface.Color measurements equipment can be chromascope, also can be industrial camera, Digital Video.Debugging computer can pass through to send to color measurements equipment the color of assigned address on the commands for controlling color measurements device measuring screen, and receives the color-values that the color measurements device measuring obtains by data transmission interface.Use a table tripod color measurements equipment to be fixed on the correct position (watching the distance of projection screen approaching) in projection screen dead ahead with the user.
The present invention uses rgb color model representation image.The color-values of each pixel is by red, green, blue three representation in components in the image, and the present invention uses 8 binary digit data to represent color component value, and each component span all is 0-255.Also can use the extended formatting data to represent color component as required, for example represent a color component value with one 16 binary digit data, the span of color component be exactly 0 to 65535 like this.
The used nomenclature of the present invention:
| Term | Explanation |
| Projected channel | Form by pictcure generator, projector and screen |
| Pictcure generator | The input picture that generation will show can be a computer, also can be image sources such as DVD player |
| The image rectification machine | The color correction coefficient table that use sets in advance is adjusted one or more input picture colors, produces corresponding output image. |
| Debugging computer | The computer that is used for the measurements and calculations color correction coefficient |
| Projection screen | All projectors all project on this screen in the system, the position difference of the projection of every projector, thereby on screen the image of projection zones of different |
| Image | Image refers to the grating images information that projected channel is handled.Image is made up of pixel-matrix, each pixel has independently color-values, and view data leaves in pictcure generator or the image rectification machine memory. |
| Red green blue tricolor | With red, green, blue three kinds of primary colors presentation video colors.The present invention uses 8 binary digits to represent a kind of primary colors, and span is 0 to 255.A kind of color representation be (R, G, B) |
| Pixel | The component of image, each pixel has positional information and color information.Pixel color is represented with the RGB three primary colors |
| Input picture | The image that pictcure generator produces |
| Output image | The image that input picture obtains after the image rectification machine is handled |
| Projected image | Projector projects to input signal the image that forms on the screen |
| Display resolution | The resolution of the picture signal of projector's projection is represented with the line number and the columns of image pixel dot matrix |
The detailed step that the present invention carries out colour correction to each projected channel is as follows:
One, the color correction coefficient initial value is set
Color correction coefficient is deposited and is in the image rectification machine memory, is used for input picture pixel color is adjusted, and calculates output image.Color correction coefficient is corresponding with the input color-values, so color correction coefficient is divided into three groups of data, and respectively corresponding red, green, blue color correction coefficient, every group of data have 256 coefficients, respectively to correction coefficient that should component 0-255 color-values.
It is 0 that each initial value data of color correction coefficient is set, this moment the image rectification machine that input picture is proofreaied and correct the output image and the input picture color-values that obtain is identical.
Two, measure each passage color map data
Control color measurements equipment enables to measure and specifies the view field (Fig. 2) of projected channel on projection screen, and debugging computer can begin to measure to color measurements equipment transmission instruction, also can read the color-values of measurement point reflection from color measurements equipment.Debugging computer reads in the measurement color-values from color measurements equipment, by the color conversion cell conversion, obtains the rgb color mapping (enum) data.
Pictcure generator produces input picture, and making pixel color-values redness, green, the blue component of input picture all is C, and C is in 0 to 255 scope.For the first time the C value being set is 0, and pictcure generator sends to the image rectification machine to input picture, obtains output image after the image rectification machine is proofreaied and correct, and input projector projects on the screen.Debugging computer obtains the color-values of projected image on the projection screen by color measurements equipment, like this must with input color-values C corresponding measurement color-values Ro, Go, Bo, the measured value of expression redness respectively, green, blue component leaves in the debugging computer memory.For the second time the C value being set is 1, repeats above-mentioned steps; Repeatedly carry out aforesaid operations, all carried out corresponding measuring operation, can obtain the measured value of all input color three primary colors value correspondences, leave in the debugging computer memory, get the color map data of a passage up to color-values to 0 to 255.The color map data are made up of three groups of data, corresponding respectively red, green, blue color map data, and every group of data are made up of 256 data.
Successively each projected channel in the system is carried out above step, obtain the color map data of each projected channel.
Three, calculate the object color component mapping (enum) data
The object color component mapping (enum) data is identical with the color map data structure of each passage.
It is as follows to calculate object color component mapping (enum) data process:
1. debugging computer is read the color map data of each passage from memory, calculates the public Color Range (as Fig. 4) of color map data.Three groups of data to the color mapping (enum) data are carried out following processing respectively: input color map data are calculated the maximum of these group data to maximum value calculation unit, leave in the memory; Simultaneously the color map data are input to minimum calculation unit, obtain the minimum value of these group data, leave in the memory, promptly get three groups of data span separately of passage color map data.The method that use seeks common ground is calculated public Color Range, the maximum of the color map data of all projected channel is input to minimum calculation unit, the minimum value of the color map data value of all projected channel is input to maximum value calculation unit, promptly obtains the public Color Range of all passages.Public Color Range is made up of three groups of data, corresponding respectively red, green, blue component, and every group of data are made up of a minimum value and a maximum, determine a span.
2. debugging computer calculating object color component mapping (enum) data process is (Fig. 5): with the color map data input average calculation unit of each passage, calculate the average color mapping (enum) data of all passages, the average color mapping (enum) data is input to the fitting of a polynomial unit, use least square fitting cubic polynomial function, calculate level and smooth average color mapping (enum) data, with average color mapping (enum) data and public Color Range input linear transform unit, the average color mapping (enum) data is carried out linear change, make its span in public Color Range, so just can obtain the object color component mapping (enum) data, note is C
t=(r
t, g
t, b
t), by r
t, g
t, b
tThree groups of data are formed, the object color component mapping (enum) data that expression is red, green respectively, blue component is corresponding, and every group of data have 256 data.
Four, calculate color correction coefficient
After obtaining the object color component mapping (enum) data, use the color correction coefficient A (t) of a projected channel of iteration Method.The iterative computation process as shown in Figure 3.Color correction coefficient is expressed as A (t)=(r
a, g
a, b
a), t adjusts number of times, and initial value is 0, and each value of adjusting back t increases by 1.r
a, g
a, b
aCorrespond respectively in the RGB three primary colors redly, the color correction coefficient of green and blue component is made up of 256 numerals, respectively each color correction coefficient when importing color-values of correspondence.During t=0, color correction coefficient is initial value (the initial value setting up procedure sees above), computational process such as Fig. 6.
1. control color measurements equipment, enable to measure the view field (Fig. 2) of appointment projected channel on projection screen, debugging computer can send instruction to color measurements equipment to begin to measure, and also can read the color-values of measurement point reflection from color measurements equipment.Debugging computer reads in the measurement color-values from color measurements equipment, by the color conversion cell conversion, obtains the rgb color data.
The input picture that pictcure generator is produced is provided with, and making the pixel color-values of input picture all is C for red, green, blue component, and C is in 0 to 255 scope.For the first time the C value being set is 0, obtains output image after the image rectification machine is proofreaied and correct, and input projector projects on the screen.Debugging computer obtains the color-values of projected image on the projection screen by color measurements equipment, like this must with input color-values C corresponding measurement color-values Ro, Go, Bo, the measured value of expression redness respectively, green, blue component leaves in the debugging computer memory.For the second time the C value being set is 1, carry out above-mentioned steps repeatedly, all carried out corresponding measuring operation, can obtain the measured value of all input color three primary colors value correspondences up to color-values to 0 to 255, leave in the debugging computer, get the color map data of a passage.The color map data are made up of three groups of data, corresponding respectively red, green, blue color map data, and every group of data are made up of 256 data.
2. calculate the difference between projected channel color map data and the object color component mapping (enum) data: input color-values C
0=(r
0, g
0, b
0), measure and measure color-values C
i=(r
i, g
i, b
i); C in the object color component mapping (enum) data
0Respective value is C
t=(r
t, g
t, b
t), C
tAnd C
iThe input subtrator calculates heterochromia, and computational process is to use C
tThree component values deduct C
iThe respective components value obtains heterochromia e=C
t-C
i=(r
t-r
i, g
t-g
i, b
t-b
i).
3. if when the t time adjustment process, difference e=(r that subtrator is calculated
e, g
e, b
e) input difference comparing unit, the difference e (t-1) during with the t-1 time iteration compares, if the absolute difference of difference e of twice calculating in front and back (t) and e (t-1) in the specification error scope, is then finished the colour correction of this passage.Error range has determined the precision of colour correction, and in general error range is more little, and then correction accuracy is high more.But correction accuracy also is subjected to the influence of measurement error of color measurements equipment, so error range can not be 0.Judge that the process that colour correction has restrained is: the absolute value that calculates difference e (t) that calculates for the t time and the difference e of calculating for the t-1 time (t-1), obtain absolute error err=|e (t)-e (t-1) |, if err approaches the specification error value, illustrate that then colour correction finishes, specification error value scope is in (0,0.1).
4. if diversity ratio also not in the specification error scope, then needs to continue to calculate color correction coefficient than the unit judges difference.Debugging computer reads in color correction coefficient from the image rectification machine, deposit in the memory, be designated as A (t-1),, multiply each other with constant k and e (t) with difference e (t) and A (t-1) input correction coefficient calculation, multiplied result and correction coefficient A last time (t-1) addition, obtain the color correction coefficient A (t) after the iteration the t time, A (t)=A (t-1)+ke (t), k is a constant, its span is (0.1,2).
In current correction coefficient Table A (t) input picture inspection machine, the input picture color-values is adjusted.Input picture is input in the image rectification machine, is stored in memory, the image rectification machine reads in input picture from memory, and the input picture reading unit is handled (as shown in Figure 7) to the color-values of each pixel in the image.The current pixel color-values of handling in the input picture is C
0=(r
0, g
0, b
0), with C
0With color correction coefficient A (t) input adder unit, calculate input color-values three-component and color correction coefficient respective components with, then can obtain adjusted pixel color-values, be C '=(r
0+ r
a[r
0], g
0+ g
a[g
0], b
0+ b
a[b
0]), will adjust the plain color-values input picture of after image writing unit, deposit the memory assigned address in.After all pixels of all input pictures are all finished dealing with, then obtain output image.The image rectification machine outputs to projector to output image.
Proceed step 1, carry out the iterative computation process the t+1 time.
Five, use the color correction coefficient table in the actual motion
After colour correction is finished, all deposited the color correction coefficient that calculates in the above step in each channel image inspection machine, at this moment can proofread and correct input picture with color correction coefficient, to reach the purpose that the present invention reduces heterochromia between each passage projected image.
Pictcure generator produces input picture, is input to image rectification machine memory.The image rectification machine is adjusted the input picture color-values.The image rectification machine reads in input picture from memory, the input picture reading unit is handled (as shown in Figure 7) to the color-values of each pixel in the image.Pending pixel color values is C in the input picture
0=(r
0, g
0, b
0), with C
0With color correction coefficient A (t) input adder unit, calculate input color-values three-component and color correction coefficient respective components with, then can obtain adjusted pixel color-values, computing formula is C '=(r
0+ r
a[r
0], g
0+ g
a[g
0], b
0+ b
a[b
0]), will adjust the plain color-values input picture of after image writing unit, deposit memory in.After all pixels of all input pictures are all finished dealing with, then obtain output image.The image rectification machine outputs to projector to output image.
Claims (5)
1, a kind of color correcting method that is used for reducing color different between channel of multi-channel projection display system, system is made up of pictcure generator, image rectification machine, projector, debugging computer, color measurements equipment and projection screen; Pictcure generator, image rectification machine and projector form projected channel; There are at least two projected channel in system; The color correcting method step is as follows:
(1) pictcure generator of each projected channel produces input picture, input projector after the image rectification machine is proofreaied and correct, project to projection screen, color measurements equipment obtains the color-values of screen picture, the color conversion cell of input debugging computer, obtain the color map data of each projected channel input picture color-values, deposit memory in to the screen picture color-values;
(2) debugging computer calculates the object color component mapping (enum) data of system according to the color map data of each passage, deposits memory in;
(3) debugging computer calculates the color correction coefficient of each passage, the image rectification machine uses color correction coefficient that the input picture that pictcure generator produces is proofreaied and correct, to proofread and correct back image input projector, project to screen, obtain the color map data by color measurements equipment, the difference of color map data and object color component mapping (enum) data behind the calculation correction, if the difference value of twice correction in front and back has converged in the specification error scope, then colour correction is finished; Otherwise carry out step (3) once more;
(4) color correction coefficient that step (3) is obtained deposits the image rectification machine in, and the image rectification machine uses color correction coefficient, and input picture is handled, and will proofread and correct back image input projector.
2, according to the method in the claim 1, it is as follows to it is characterized in that calculating the color map data method in the step (1): pictcure generator produces input picture, the color measurements device measuring obtains the screen picture color-values corresponding with input picture pixel color-values, use a frame or multiframe input picture, repeat above-mentioned steps, screen color value up to this projected channel that measures all input color-values correspondences through color conversion cell, gets projected channel color map data.
3, according to the method in the claim 1, the method that it is characterized in that the object color component mapping (enum) data of computing system in the step (2) is as follows: debugging computer is according to the span of each passage color map data of color map data computation of each projected channel, calculate the public Color Range of all passage color map data again, deposit memory in; All projected channel color map data input average calculation unit, calculate average mapping (enum) data; With average mapping (enum) data input fitting of a polynomial unit, calculate level and smooth mapping (enum) data, result of calculation is imported linear transform unit, carry out linear transformation with the public Color Range of storing in the memory, make the data span in public Color Range, get the object color component mapping (enum) data.
4, according to the method in the claim 1, it is characterized in that the method for each passage colour correction in the step (3) is as follows: debugging computer at first is provided with the color correction coefficient initial value, deposits memory in; Color map data in the debugging computer memory and object color component mapping (enum) data input subtrator, the difference input difference comparing unit that calculates, the difference of input last computation from memory, the difference of twice of front and back is compared, comparative result input color correction coefficient computing unit, if comparative result is in the specification error scope, then the gained color correction coefficient deposits image rectification machine memory in, finishes the process of calculating color correction coefficient; If comparative result outside error range, is then stored color correction coefficient to image rectification machine memory, use color correction coefficient that input picture pixel color-values is adjusted, export adjusted image to projector, proceed step (3).
5, according to the method in the claim 1, it is characterized in that in the step (4), pictcure generator produces input picture and deposits in the image rectification machine memory, image fetching unit is read the color-values of each pixel of input picture successively, be input to adder unit, with the color correction coefficient addition, obtain proofreading and correct the plain color-values of after image, by the image writing unit write memory.
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| CN108737806A (en) * | 2018-08-30 | 2018-11-02 | Oppo广东移动通信有限公司 | A kind of projecting apparatus color correcting method and device, computer storage media |
| US10694160B2 (en) | 2018-11-20 | 2020-06-23 | Disney Enterprises, Inc. | Channel based projector calibration |
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