JP2000121497A - Luminance inspection device and luminance inspection method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To perform a luminance inspection of a dot matrix light-emitting product for each emission color without changing a measurement range setting for each color, thereby simplifying the operation. SOLUTION: A model image pattern arbitrarily set in a display image on a monitor is input from an input control unit 13,
The reference coordinates and the start and end points of the luminance measurement range are registered in the model image / set coordinate storage unit 14. And
The measurement range switching control unit 15 searches for a pixel group having the same shape as the above-described image pattern in a state where only the respective colors of red, green, and blue are lit, and determines a pixel group having the closest luminance distribution to the image pattern. The measurement range corresponding to the determined pixel group is determined based on the information registered in the model image / set coordinate storage unit 14, and the brightness calculation unit 18 calculates the brightness of the measurement range for each color. Perform sequentially.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a luminance inspection apparatus and a luminance inspection method for inspecting luminance of a dot matrix light emitting product of a multi-color light emitting type.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing the configuration of a system for inspecting the brightness of a dot matrix light emitting product.
This system includes a work 2 lit by a lighting device 1.
Is photographed by the CCD camera 3 and the photographed image is taken into the luminance inspection device 4. Then, the image is displayed on the screen of the monitor 5 by the image signal output from the luminance inspection device 4.

The work 2 is a dot matrix light-emitting product that emits a plurality of colors by a light source such as an LED. As shown in FIG. 7, each dot (pixel) 6 has red, green, and blue colors. Illuminators 6r, 6g, and 6b.

When the luminance (brightness) of each dot is inspected for each color, the position projected on the monitor differs depending on the color. Therefore, first, only the red light emitter 6r is turned on by the lighting device 1 and FIG. The start point 7r1 and the end point 7r2 of the red measurement range 7r shown in FIG. 9A are determined using a mouse or the like on a monitor, and the range to be measured is evenly divided by the number of dots, and the brightness of each dot is determined. Is measured by its projected density (light to dark).

Next, only the green light-emitting body 6g is turned on, and the start point 7g1 and the end point 7g2 of the green measurement range 7g shown in FIG. Measure the brightness of.

Next, only the blue light-emitting body 6b is turned on, and the start point 7b1 of the blue measurement range 7b shown in FIG.
And the end point 7b2 are determined on the monitor, and the luminance of each dot is measured.

[0007]

The brightness test of a conventional dot matrix light emitting product is performed as described above, and since the projection position differs for each color, it is necessary to switch the measurement range for each color. Is complicated.

For this reason, it has been proposed to reduce the number of operations by storing the measurement range for each color in a memory or the like, but even in this case, a switching operation is required each time the color to be measured is changed.

In addition, the projection position of the same color may differ slightly depending on the product due to an error between lots and the like. In this case, it is necessary to reset the start point and the end point of the measurement range. It takes.

The present invention has been made in view of the above-mentioned problems, and there is no need to manually change the setting of the measurement range for each color, so that the operation is simplified, the operation time is shortened, and the accuracy is reduced. It is an object of the present invention to provide a luminance inspection device and a luminance inspection method capable of setting a proper range.

[0011]

A luminance inspection apparatus and a luminance inspection method according to the present invention are configured as follows.

(1) An apparatus for inspecting luminance of a dot matrix light-emitting product, which comprises an input section for inputting an image pattern of a desired shape arbitrarily set, and a position of a luminance measurement range corresponding to the input image pattern and the image pattern. A storage unit that stores information; and a control unit that searches for a pixel group having the same shape as the image pattern and determines a pixel group whose luminance distribution is similar to that of the image pattern, and has a luminance corresponding to the determined pixel group. The luminance of the measurement range was calculated for each color.

(2) A brightness inspection method for a dot matrix light emitting device, wherein an arbitrary image pattern having a desired shape is set, and position information of a brightness measurement range corresponding to the image pattern is stored in a memory. A pixel group having the same shape as the image pattern is searched to determine a pixel group whose luminance distribution is similar to that of the image pattern, and a measurement range corresponding to the determined pixel group is determined based on the position information stored in the memory. After the determination, the luminance of each color was calculated.

[0014]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention, and shows an internal configuration of a luminance inspection apparatus 4 in the system of FIG.

In FIG. 1, reference numeral 11 denotes an image capturing unit for capturing image data from the CCD camera 3 shown in FIG. 6, 12 an image output unit for outputting an image to the monitor 5, and 13 an arbitrarily set model image having a desired shape. An input control unit for inputting a pattern and its reference coordinates from a keyboard / mouse or the like; a model image / set coordinate storage unit for storing the input information; and a measurement range switching control unit for switching the measurement range Then, a pixel group having the same shape as that of the input model image pattern and having the same luminance distribution as the model image pattern is searched.

In FIG. 1, reference numeral 16 denotes a measurement range division control unit for controlling the division of the measurement range, and changes the start point and the end point of the measurement range in accordance with the pixel group information obtained by the above search. Reference numeral 17 denotes an image synthesizing unit for synthesizing the captured image data and setting information of the measurement range. Reference numeral 18 denotes a luminance calculation unit for calculating the luminance (brightness) of a pixel group in the measurement range for each color. Etc. and are processed.

Next, an inspection procedure in the apparatus having the above configuration will be described with reference to FIGS. FIG. 2 is a diagram illustrating an example of the above-described model image pattern, FIG. 3 is a diagram illustrating an example of setting the model image pattern, and FIG. 4 is a diagram illustrating an inspection procedure.

First, a model image pattern 8 and its reference coordinates 8 shown in FIG.
s is set arbitrarily. The model image pattern 8 targets an area 9 obtained by cutting out the image on the end side when only the red light emitter 6r of each dot 6 is turned on. The setting method is a start point 9p1 and an end point 9p2 using a mouse or the like, and reference coordinates 9s. (Any location in the box) to determine the pattern.

At this time, the reference coordinates 8 in the image pattern 8
The relative position (coordinates) of s in the same pattern 8 is stored inside the apparatus, so that the relative position of the reference coordinates 8s does not change regardless of where the image pattern 8 moves on the monitor image.

Then, in the image in which only the red light is lit, a pixel group having the same size and shape as the model image pattern 8 (pixels are the minimum unit constituting the image, and 256 levels of luminance data are provided for each pixel. Are sequentially compared, and a search is made for an image pattern in which the luminance distribution of the pixels in the model image pattern 8 and the model image pattern 8 is the closest, as shown in FIG.
The image pattern 9r shown in FIG. When the above model image pattern 8 is placed at the position of this image pattern 9r,
The position of the reference coordinates 8s can be automatically set at the position of the reference coordinates 9rs of the image pattern 9r as described above.

In the above state, the start point 10r1 and the end point 10r2 of the measurement range are determined on the monitor image as in the related art. At this time, the difference between the coordinate values of the start point 10r1 and the end point 10r2 is stored inside the apparatus. For example, starting point 10
The value (X, Y) of r1 is (10, 10), and the end point 10r2
Is (40, 15), the coordinate difference value between them is (30, 5).

The difference between the reference coordinates 9rs in the image pattern 9r and the coordinate value of the start point 10r1 of the measurement range is stored in the apparatus. For example, the value (X,
Assuming that (Y) is (5, 13) and the value (X, Y) of the starting point 10r1 is (10, 10), the coordinate difference value between the two is (5,-).
3).

Next, when the same image pattern as the model image pattern 8 is searched for in the image in which only the green illuminant 6g is turned on, the image pattern 9g shown in FIG. 4B is applied. When the model image pattern 8 is placed at the position of the image pattern 9g, the position of the reference position 8s can be automatically placed at the position of the reference coordinate 9gs of the image pattern 9g.

The start point 10g1 of the measurement range in the image with only green light turned on is determined by the coordinate difference value between the position of the coordinates 9gs and the stored start point 10r1.
Is determined by internal processing. Also, the end point 10g2 is determined by internal processing based on the coordinate difference value between the stored start point 10r1 and end point 10r2.

Next, when the same image pattern as the model image pattern 8 is searched for in the image where only the blue light emitter 6b is turned on, the image pattern 9b shown in FIG. 4C is applied. When the model image pattern 8 is placed at the position of the image pattern 9b, the position of the reference position 8s can be automatically placed at the position of the reference coordinates 9bs of the image pattern 9b.

Then, the start point 10b1 of the measurement range in the image in the state where only blue is lit is determined by the coordinate difference value between the position of the coordinates 9bs and the stored start point 10r1.
Is determined by internal processing. Similarly, the end point 10b2 is determined by internal processing based on the coordinate difference value between the start point 10r1 and the end point 10r2 stored above.

Thus, the model image pattern 8, the reference coordinates 8s, the start point 10r1 and the end point 10 of the measurement range
By setting r2 first, the measurement range is switched by internal processing when measuring different colors or different works 2.

Therefore, there is no need to manually switch the setting of the measurement range for each color, and the operation is simplified, the operation time is shortened, and an accurate range setting can be performed.

Next, processing contents in the inspection apparatus of FIG. 1 will be described. CCD input to image capture unit 11
The image data from the camera 3 is converted into a digital signal here and stored in the memory.

The information on the range of the model image pattern 8 and the reference coordinates 8 s is taken into the input control unit 13 from a keyboard, a mouse, or the like, and passed to the model image / set coordinate storage unit 14. Based on this, the model image / set coordinate storage unit 14 cuts out part of the image data stored in the image capturing unit 11 and stores it as a model image.

The start point, end point, and matrix configuration information for determining an individual (dot-by-dot) measurement range are input to the input control unit 13 from a keyboard / mouse or the like. Passed.

When an instruction to start an examination is passed from the keyboard / mouse or the like to the input control unit 13, start command data is sent from the input control unit 13 to the measurement range switching control unit 15.

The measurement range switching control unit 15 receiving the start command instructs the image capturing unit 11 to capture an image. The image capturing unit 11 captures the current raw image from the CCD camera 3 into the memory in the same manner as described above.

The measurement range switching control unit 15 accesses the model image / set coordinate storage unit 14, reads the stored model image pattern and reference coordinates, and stores the model image and the reference image in the captured raw image data. Search for the same image pattern. Then, a movement value on the absolute coordinates of the reference coordinates when the same image pattern is found is calculated and passed to the measurement range division control unit 16.

The measurement range division control unit 16 changes the start point and the end point of the passed measurement range by the amount of movement of the reference coordinates that have been passed. And the changed starting point,
Based on the end point and the matrix configuration information passed above,
Creates individual (dot by dot) range frame information,
Pass to 7. Further, the individual (dot-by-dot) range coordinate values are passed to the luminance calculation unit 18 by the number of dots.

The image synthesizing unit 17 synthesizes the projected image of the work 2 from the image capturing unit 11 and the individual range frame information from the measurement range dividing control unit 16 and passes the synthesized image to the image output unit 12.

The image output unit 12 converts the received composite image information into a video signal and outputs the video signal to the monitor 5. Monitor 5
, The projected image of the work 2 and the range frame are displayed at the same time.

The luminance calculator 18 calculates individual (dot by dot) luminance values (projected density values in the corresponding range) and transfers them to a personal computer or the like (b).

FIG. 5 is a flowchart showing an outline of the processing operation of the above-described embodiment. Although not shown, the control process shown in this flowchart is executed according to a program stored in a memory (ROM) in advance.

First, a model image pattern and reference coordinates are set as described above (S1), and the relative position of the reference coordinates is stored in a memory (S2). Then, an image pattern of the same shape is searched while only red is turned on (S3), the start point and the end point of the measurement range are determined, and the brightness is calculated (S3).
4) The difference information between the start point and the end point is stored in the memory (S5).

Next, an image pattern is searched for in the same manner as described above in the lighting state of green only (S6), and the coordinate position, the start point and the end point are determined based on the difference information, and the luminance is calculated ( S7). Similarly, the image pattern is searched in the lighting state of only blue (S8), and the coordinate position, the start point and the end point are determined, and the luminance is calculated (S9).

[0042]

As described above, according to the present invention, when performing a luminance test for each color in a dot matrix product of a multi-color emission type, a part of the projected image is registered as a model image, Since the inspection range for each color is automatically set simply by inputting the start point, the end point, and the matrix configuration, there is no need to manually switch the inspection range setting for each color as in the conventional case, and the operation time is greatly reduced. .

Further, when the product to be inspected is replaced, the projected position of the image may move due to the play of the product or the misalignment of the lamp, etc. Even in such a case, the inspection range setting must be manually switched. And accurate range setting can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of a model image pattern.

FIG. 3 is an explanatory diagram showing a setting example of a model image pattern;

FIG. 4 is an explanatory view showing an inspection procedure according to the embodiment.

FIG. 5 is a flowchart illustrating a processing operation according to the embodiment;

FIG. 6 is a block diagram showing a system configuration of a luminance test.

FIG. 7 is an explanatory diagram showing a configuration of each dot of a work.

FIG. 8 is an explanatory view showing a conventional inspection procedure.

[Explanation of symbols]

 Reference Signs List 1 lighting device 2 work 3 CCD camera 4 luminance inspection device 5 monitor 6 dot 6r illuminant 6g illuminant 6b illuminant 8 model image pattern 8s reference position 9 area 9p1 start point 9p2 end point 9s reference coordinate 9r image pattern 9g image pattern 9b image pattern 9rs reference coordinate 9gs reference coordinate 9bs reference coordinate 10r measurement range 10g measurement range 10b measurement range 10r1 start point 10g1 start point 10b1 start point 10r2 end point 10g2 end point 10b2 end point 11 image capture unit 12 image output unit 13 input control unit 14 Model image / set coordinate storage unit 15 Measurement range switching control unit 16 Measurement range division control unit 17 Image synthesis unit 18 Brightness calculation unit

Claims (2)

[Claims] 1. A brightness inspection apparatus for a dot matrix light emitting product, comprising: an input unit for inputting an image pattern of a desired shape that is arbitrarily set; and positional information of the input image pattern and a brightness measurement range corresponding to the image pattern. And a control unit for retrieving a pixel group having the same shape as the image pattern and determining a pixel group having a luminance distribution similar to the image pattern, and measuring the luminance according to the determined pixel group. A luminance inspection apparatus, wherein the luminance of a range is calculated for each color. 2. A method of inspecting luminance of a dot matrix light emitting device, wherein an arbitrary image pattern having a desired shape is set, and position information of a luminance measurement range corresponding to the image pattern is stored in a memory. A pixel group having the same shape as the pattern is searched to determine a pixel group whose luminance distribution is similar to that of the image pattern, and a measurement range corresponding to the determined pixel group is determined based on the position information stored in the memory. A luminance calculation method for each color.