JP2011252770A - Inspection device for printed circuit board and inspection method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection device for a printed circuit board which does not need imaging of a non-defective printed circuit board and registration of reference data prior to starting an inspection of the printed circuit board, and can inspect the board from the first one.SOLUTION: The inspection device for a printed circuit board comprises: image obtaining means for obtaining a color image of the printed circuit board, which is obtained by imaging the printed circuit board to be inspected; region dividing means for dividing the obtained color image of the printed circuit board into multiple regions according to the difference of the color; color inspecting means for specifying the parts specific in color in each of the divided regions; contour extracting means for extracting contours of each of the divided regions; and shape inspecting means for inspecting presence or absence of anomalies of the shape of each of the regions based on the respective extracted contours.

Description

  The present invention relates to a printed circuit board inspection apparatus for inspecting the quality of a surface of a printed circuit board and an inspection method therefor.

  Conventionally, as this type of printed circuit board inspection apparatus, an image of the surface of a printed circuit board to be inspected is captured by an imaging means such as a CCD camera, and inspection image data is obtained by this imaging. Next, for example, a difference between each pixel value of the inspection image data and each pixel value of reference image data prepared in advance is obtained, and it is determined whether or not the difference is within an allowable range. Furthermore, the quality of the printed circuit board to be inspected is determined based on the determination result.

  For this reason, in the printed circuit board inspection apparatus, it is necessary to prepare the reference image data in advance and determine the allowable range in advance prior to the inspection of the printed circuit board. Therefore, conventionally, in order to obtain the above-described reference image data, it is necessary to prepare a large number of image data obtained by imaging a non-defective printed circuit board, and thus there is a disadvantage that it takes a long time to obtain the reference image data. It was.

In order to solve such a problem, there is known a printed circuit board inspection apparatus capable of shortening the creation time of reference image data and the like prepared prior to the start of printed circuit board inspection (for example, cited reference 1). reference).
However, even in the inspection apparatus of this cited reference 1, it is necessary to capture a good printed circuit board and acquire image data before starting the inspection of the printed circuit board, and it is also necessary to register reference image data in advance. There is.

On the other hand, in recent years, there is a demand for inspection of a prototype printed circuit board. In this case, since there are about several to ten printed circuit boards to be inspected, there is an inconvenience that the conventional apparatus cannot perform inspection. .
Under such a background, prior to the start of inspection of a printed circuit board, it is unnecessary to image a non-defective printed circuit board and register reference data, and a new apparatus and method capable of inspecting from the first printed circuit board The appearance of is desired.

JP 2003-156448 A

  Therefore, an object of the present invention is to eliminate the need for imaging a non-defective printed circuit board and register reference data before starting the inspection of the printed circuit board, and a printed circuit board inspection apparatus capable of inspecting from the first sheet. It is to provide a method.

In order to solve the above-described problems and achieve the above object of the present invention, each invention is configured as follows.
That is, the first invention is an image acquisition unit that acquires a color image of a printed circuit board obtained by imaging a printed circuit board to be inspected, and the acquired color image of the printed circuit board is divided into a plurality of regions according to the color difference. Area dividing means, color inspecting means for specifying a unique portion of the color in each divided area, outline extracting means for extracting the outline of each divided area, and each extracted outline And a shape inspection means for inspecting whether there is an abnormality in the shape of each region.

According to a second invention, in the first invention, the data specifying the shape of each area divided by the area dividing means for the color image of one printed circuit board is used, and the area dividing means for the color image of another printed circuit board. Compared with the data for specifying the shape of each area divided in step (b), the apparatus further includes area comparison inspection means for inspecting the quality of the shape of each area.
According to a third aspect, in the second aspect, the inspection result of each region inspected by the color inspection unit, the inspection result of each region inspected by the shape inspection unit, and each region inspected by the region comparison inspection unit Based on the inspection result, a color image of the one printed circuit board is divided by the area dividing unit with respect to a part of each area divided by the area dividing unit. Data updating means for replacing the data specifying the shape of a part of each region with data is further provided.

  According to a fourth invention, in the first to third inventions, the color image acquired by the image acquisition means, the inspection result of each area inspected by the color inspection means, and the inspection of each area inspected by the shape inspection means Based on the result, setting means for setting one of detection necessary information and detection unnecessary information, and when the detection necessary information is set, the inspection result inspected by the color inspection means and the shape inspection A first processing means for processing a detection-necessary part as a defective part based on the detection-necessary information set for the inspection result inspected by the means; and when the detection-unnecessary information is set, the color About the inspection result inspected by the inspection means and the inspection result inspected by the shape inspection means, the detection unnecessary part is determined as a non-defective part based on the set detection unnecessary information. A second processing means for processing Te further comprises a.

  According to a fifth invention, in the first to fourth inventions, the area dividing means is set for each of a plurality of areas to be divided of the obtained color image of the printed circuit board, and is representative of each area. Based on the color of each pixel of the color image of the printed circuit board, the representative color acquisition means for acquiring the color, and referring to the representative colors of the plurality of areas acquired by the representative color acquisition means, respectively, among the plurality of representative colors A first dividing unit that changes the color of each pixel to any one of the regions and divides the region; and among regions divided by the first dividing unit, a predetermined region has a color of the region Second dividing means for re-dividing according to the difference in brightness.

  According to a sixth aspect of the present invention, there are provided a first step of acquiring a color image of a printed circuit board obtained by imaging a printed circuit board to be inspected, and a plurality of color images of the printed circuit board acquired in the first step according to a color difference. A second step of dividing the region into a region, a third step of identifying a unique portion of the color in each region divided in the second step, and a step of each region divided in the second step A fourth step of extracting a contour; and a fifth step of inspecting whether there is an abnormality in the shape of each region based on each contour extracted in the fourth step.

  A seventh invention is a printed circuit board inspection method for inspecting the same plurality of printed circuit boards, and includes a first step of acquiring a color image of a printed circuit board obtained by imaging a printed circuit board to be inspected, A second step of dividing the color image of the printed circuit board obtained in the step into a plurality of regions according to the difference in color, and specifying a unique portion of the color in each region divided in the second step A third step, a fourth step for extracting the contour of each region divided in the second step, and whether there is an abnormality in the shape of each region based on each contour extracted in the fourth step In the case of inspecting one printed circuit board, each process from the first to the fifth processes is performed, and in the case of inspecting another printed circuit board, In addition to the first to fifth steps, the sixth step In the sixth step, data specifying the shape of each region divided in the second step for the color image of the one printed circuit board is used for the color image of the other printed circuit board. The quality of the shape of each region is inspected by comparing with the data specifying the shape of each region divided in the step 2.

  In an eighth invention, in the seventh invention, when the other printed circuit board is inspected, the eighth invention includes a process of a seventh process in addition to the processes of the first to sixth processes. In step 7, based on the inspection result of each region inspected in the third step, the inspection result of each region inspected in the fifth step, and the inspection result of each region inspected in the sixth step, For a part of the regions divided in the second step for the color image of the one printed circuit board, for each region divided in the second step for the color image of the other printed circuit board. It replaces with data specifying the shape of a part of the area.

  In a ninth aspect based on the eighth aspect, in the case of inspecting the other printed circuit board, in addition to the processes up to the first to seventh steps, the sixth step and the seventh step The eighth step includes the color image acquired in the third step, the inspection result of each region inspected in the fifth step, and the sixth step. A determination step for determining whether or not one of detection-necessary information and detection-unnecessary information is set based on the inspection result of each region inspected in the step, and when the detection-necessary information is set If determined, the detection required part is processed as a defective part based on the set detection necessary information for the inspection result inspected in the fifth process and the inspection result inspected in the sixth process. First processing step to be performed and the detection is unnecessary If it is determined that the information has been set, the inspection result inspected in the fifth step and the inspection result inspected in the sixth step need not be detected based on the set detection-unnecessary information. And a second processing step for processing the part as a non-defective part.

  In a tenth aspect based on the sixth to ninth aspects, the second step is set for each of a plurality of regions to be divided in the color image of the printed circuit board obtained in the first step. Based on the representative color acquisition step of acquiring a representative color representing each region, and the color of each pixel of the color image of the printed circuit board, the representative colors of the plurality of regions acquired in the representative color acquisition step are respectively referred to. A first division step of changing the color of each pixel to any one of a plurality of representative colors and dividing the region, and a predetermined region among the regions divided in the first division step And a second dividing step of re-dividing according to the difference in lightness of the color of the area.

According to the present invention, when a printed circuit board is inspected, imaging of a non-defective printed circuit board and registration of reference data are not required prior to the start of the inspection, and inspection can be performed from the first sheet.
Further, according to the present invention, the inspection accuracy can be improved as the number of printed circuit boards to be inspected increases.

It is a block diagram which shows the structure of embodiment of this invention apparatus. It is a top view which shows an example of the printed circuit board applied to the test | inspection of this invention. 4 is a flowchart illustrating a procedure for inspecting a first printed circuit board in the embodiment of the present invention. In the embodiment of the present invention, it is a flowchart which shows the procedure of the inspection of the printed circuit board from the 2nd sheet. It is a flowchart which shows an example of the specific procedure for dividing | segmenting into a several area | region according to color. It is a flowchart which shows an example of the specific procedure of the test | inspection of the shape of each area | region by an outline. It is explanatory drawing for demonstrating the procedure. It is a flowchart which shows an example of the specific procedure of the color test | inspection of the specific part in each area | region.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Explanation of inspection equipment)
The configuration of an embodiment of the printed circuit board inspection apparatus of the present invention will be described with reference to FIG.
As shown in FIG. 1, this embodiment includes at least an imaging device 1, an image processing device 2, an image memory 3, a storage device 4, an input device 5, and a display device 6.

  The imaging device 1 captures the appearance of a printed circuit board as shown in FIG. 2 with an imaging device such as a CCD camera, acquires a color image signal composed of an R signal, a G signal, and a B signal. A / D conversion is performed by a D converter (not shown) to generate and output digital image data. Each of the RGB color image data is composed of, for example, a gray value of 8 bits (0 to 255).

The image processing apparatus 2 performs processing such as various comparisons and calculations as described later based on image processing and printed circuit board inspection procedures (programs) stored in the storage device 4 as described later. For this purpose, the image processing apparatus 2 includes a CPU (central processing unit), a work memory, and the like.
The image memory 3 stores the R, G, B data of the color image of the printed circuit board imaged by the imaging device 1 and the H, S, V data converted from the R, G, B data of the color image. Memorize temporarily.

The storage device 4 is composed of a hard disk, a flexible disk, or an optical disk, stores image processing performed by the image processing apparatus 2 and a procedure (program) for inspecting a printed circuit board, and stores a large amount of image data as will be described later. .
The input device 5 gives instructions and settings as described later to the image processing device 2 in response to a request from the image processing device 2, and is composed of, for example, a keyboard.
The display device 6 performs a predetermined display during the image processing by the image processing device 2 or during the inspection of the printed circuit board, and includes a CRT display, a liquid crystal display, or the like.

(Description of printed circuit board)
FIG. 2 is a plan view schematically showing an example of the printed circuit board 8 to be inspected in the embodiment of the present invention.
This printed circuit board 8 has an insulating substrate 80, a first resist region 801 where a resist is applied on the insulating substrate 80, and a first resist region applied on the copper wiring pattern formed on the insulating substrate 80. Two resist regions 802, a print region 803 printed with white or the like on the insulating substrate 80, a pad region 804 plated with gold, and a substrate region where the insulating substrate 80 is exposed. 805, a through hole 806, and a mounting hole 807 are included.

(Explanation of inspection of the first printed circuit board)
Next, a procedure for inspecting the first printed circuit board 8 in the embodiment of the present invention will be described with reference to FIG.
In step S <b> 1, the printed circuit board 8 to be inspected is imaged by the imaging device 1, a color image obtained by imaging is acquired, and the acquired color image data is stored in the image memory 3. The color image data obtained at this time is R image, G image, and B image data, and these data are stored in the image memory 3.

In step S2, the obtained color image of the printed circuit board 8 is divided into a plurality of regions according to the color difference. This area division for each color refers to the representative color of each of the plurality of set areas based on the color of each pixel of the color image of the printed circuit board acquired in step S1, and among the plurality of representative colors, This is done by changing the color to any one of the pixels.
Here, when the areas are divided by color, the set representative colors of the respective areas are referred to. The representative colors of the respective areas are set as follows.

For example, the color image of the printed circuit board 8 obtained in step S 1 is displayed on the display screen of the display device 6, and the inspector uses the input device 5 to identify each area to be divided while viewing the displayed color image. If the color of an arbitrary point is specified in each specified area, the color of the specified arbitrary point is set as a representative color.
A specific example of the process of dividing the area by color is shown in FIG. 5, and the description thereof will be described later.
In step S3, a color inspection is performed to specify a unique portion of the color in each of the divided areas. This color inspection uses the color image acquired in step S1 to extract a peculiar (abnormal) portion of the color in each region divided in step S2, and this extracted portion has a predetermined size. In this case, the extracted pixel is regarded as a defective pixel. A specific example of the color inspection process is shown in FIG. 8 and will be described later.

  In step S4, the outline of each divided area is extracted. In step S5, the presence / absence of an abnormality in the shape of each region is inspected based on each extracted contour. The presence / absence of an abnormality in the shape of each region is determined by tracing the contour pixel of each divided region while obtaining the direction of each contour pixel, and based on the obtained direction of each contour pixel, the protrusions and deformed portions of each region. The contour pixel according to is regarded as a defective pixel. A specific example of this process is shown in FIG. 6 and will be described later.

In step S6, the defective pixels obtained in steps S3 and S5 are output on the display screen of the display device 6. As a result, the inspector can recognize, for each region divided by color, a defective contour pixel in a region related to a protrusion or an irregular shape of the region and a defective detection pixel related to a defective portion in the region.
In step S7, data specifying the shape of each area for comparison inspection is created based on each divided area, and the created data is stored (saved) in the image memory 3 and the storage device 4.
According to the procedure described above, prior to the start of the inspection, imaging of a non-defective printed circuit board and registration of reference data become unnecessary, and the inspection can be performed from the first sheet.

(Explanation of inspection of printed circuit board after second sheet)
Next, a procedure for inspecting a plurality of identical printed boards 8 according to the embodiment of the present invention, that is, a procedure for inspecting the second and subsequent printed boards 8 will be described with reference to FIG.
In this inspection procedure, as shown in FIG. 4, since a new procedure (step S101 to step S111) is added to the first inspection procedure, the added procedure will be mainly described below.
In the inspection of the second and subsequent printed circuit boards 8, since the same processing as that of the first sheet is performed in step S1 to step S5, the description thereof is omitted.

  In step S101, data for specifying the shape of each area divided in step S2 and the shape of each area for comparison inspection stored in the image memory 3 or the storage device 4 by inspection of the first printed circuit board 8 are obtained. A comparative inspection with data specifying In this comparison inspection, each region divided in step S2 is aligned with each region for comparison inspection stored in the image memory 3 or the storage device 4, and based on this, the difference in shape of each region is determined. Perform a comparison test.

In step S102, it is determined whether or not detection-necessary information has been set in step S110. If there is such setting, the process proceeds to the next step S103, and if there is no setting, the process proceeds to step SS104.
In step S103, regardless of whether or not the pixel is detected as a defective pixel in steps S3 and S5, a pixel in a detection necessary portion described later is detected based on the detection necessary information set in step S110 described later ( Extraction) to make defective pixels. As a result, the pixels of the necessary detection portion are output as defective pixels in step S106 described later.

In step S104, it is determined whether or not detection unnecessary information has been set in step S111. If there is such setting, the process proceeds to the next step S105, and if there is no setting, the process proceeds to step SS106.
In step S105, a detection unnecessary portion pixel described later is detected based on the detection unnecessary information set in step S110 described later (regardless of whether or not it is detected as a defective pixel in steps S3 and S5). Extraction) and set it as a non-defective pixel. As a result, the pixel of the detection unnecessary portion is not output as a defective pixel in the next step S106.

In step S106, the defective pixel detected in steps S3 and S5 and the defective pixel obtained in step S103 are displayed on the display screen of the display device 6. Further, in addition to displaying the defective detection pixel, the comparison inspection result of each region obtained in step S101 is displayed on the display screen of the display device 6.
In step S107, based on this display, the inspector uses the input device 5 to store the data for comparison inspection stored in the image memory 3 and the storage device 4 for each region for the current comparison inspection. Select whether to update the data.

In step S108, it is determined in step S107 whether or not to update with the data for the current comparative inspection is selected. If update is selected, the process proceeds to step S109, and if update is not selected. Advances to step S110.
In step S109, only the region selected this time is updated by replacing the data for comparison inspection specifying the shape of the region with the data for comparison inspection stored in the image memory 3 and the storage device 4.

In step S110, the inspector sets the necessary detection information while viewing the color image obtained in step S1 and the defective detection pixel displayed in step S106 displayed on the display screen of the display device 6. Perform in step 5. Thereby, the set detection necessary information is stored in the image memory 3 and the storage device 4.
That is, the inspector should be detected as a defective pixel that is recognized as defective on the color image, but when the same type of part that is not detected and displayed as a defective pixel is found, In order to be able to process it as a part that needs to be detected, the same type of part (necessary part to be detected) is detected (extracted) and detection necessary information for processing as a defect is set.

In step S111, the inspector sets the setting of detection-unnecessary information while viewing the color image obtained in step S1 displayed on the display screen of the display device 6 and the defective detection pixel displayed in step S106. Perform in step 5. Thereby, the set detection unnecessary information is stored in the image memory 3 and the storage device 4.
That is, the inspector should not be detected as a defective pixel on the color image and should not be detected as a defective pixel, but if he / she finds the same type of part that is detected and displayed as a defective pixel, Detection unnecessary information is set for detecting (extracting) the same type of part (detection unnecessary part) and processing the part as not defective so that the part can be regarded as an unnecessary part and can be processed.
According to the procedure described above, the inspection accuracy can be improved as the number of inspections of the printed circuit board 8 increases. Moreover, even if the number of printed circuit boards to be inspected is from several to about 10, accurate inspection can be performed.

(Description of area division by color)
Next, a specific procedure for color-based region division described in step S2 of FIG. 3 will be described with reference to FIG.
In step S21, a color image of the printed circuit board 8 to be inspected is input from the image memory 3. The input color image data consists of RGB components.
In step S22, the RGB component image data is converted into HSV component image data, and the converted HSV component image data is stored in the image memory 3.
In step S23, for each of a plurality of areas to be divided from the color image displayed on the display screen of the display device 6, each value of the HSV component of the representative color representing the color of the set area is acquired.

  That is, in step S23, the inspector specifies each area to be divided by the input device 5 while viewing the color image of the printed circuit board 8 displayed, and when an arbitrary pixel is specified in each specified area, Each value of the HSV component of the designated pixel becomes each value of the HSV component of the representative color of the region. Then, each value of the HSV component of the representative color of each set area to be divided is acquired.

Next, setting of each value of the HSV component of the representative color of each region to be divided will be specifically described with reference to FIG.
For example, when it is desired to divide the first resist region 801 where the resist is applied on the insulating substrate 80 of the printed circuit board 8, when the user designates the color of an arbitrary pixel in the first resist region 801, Each value of the HSV component of the designated pixel becomes each value of the HSV component of the representative color in the first resist region 801.

  Here, a first resist region 801 in which a resist is applied on the insulating substrate 80 of the printed circuit board 8 and a second in which a resist is applied on the copper wiring pattern formed on the insulating substrate 80 of the printed circuit board 8. The color difference from the resist region 802 is delicate. For this reason, in this example, when the first resist region 801 and the second resist region 802 are once divided as a resist region at once, for example, when the representative color of the first resist region 801 is set, The same representative color is set for the second resist region 802 as well. This collectively divided resist region is again divided into a first resist region 801 and a second resist region 802 as will be described later.

The method for setting the representative color of each region to be divided is that a print region 803 printed in white or the like on a resist applied on the insulating substrate 80, a pad region 804 plated with gold, and the insulating substrate 80 The same applies to the exposed substrate region 805 and the like.
In step S24, the degree of approximation between each value of the HSV component of each pixel of the color image on the printed circuit board 8 and each value of the HSV component of the representative color obtained in step S23 is checked, and the HSV of each pixel is checked. The component values are changed to approximate HSV component values. When this processing is completed, for example, a portion corresponding to the first resist region 801 and the second resist region 802 in FIG. 2, a portion corresponding to the print region 803, and a portion corresponding to the pad region 804 Are changed to the set representative colors.

In this example, since the first resist region 801 and the second resist region 802 are once divided as resist regions, the regions divided as the resist regions are collectively divided into the first resist region 801 and the second resist region. It is necessary to divide the area 802.
Therefore, in step S25, the first resist region 801 and the second resist region 801 are compared with the second resist region based on the difference in the value of the V component value among the HSV components of the pixels in the region divided as the resist region at once. Subdivided into resist regions 802.

In step S26, noise of the subdivided image is removed.
In step S27, for each pixel of the color image, a hole region on the color image is extracted based on the value of the G component of the RGB components, and the expansion processing of the extracted hole region is performed.
In step S28, the background area on the color image is expanded by the set number of pixels and set as a non-inspection area. In step S28, the image of the divided area is displayed and output on the display screen of the display device 6.

(Inspecting the shape of each area by contour)
Next, a specific procedure for inspecting the shape of each region by the contour described in step S5 in FIG. 3 will be described with reference to FIGS.
In step S31, an image of the divided area is input. In step S32, the contour pixels of the contour portion of the inputted divided area are traced (tracked), and the direction of each contour pixel is examined at this time.
The direction of the contour pixel is a direction in which the target pixel moves when tracing the next contour pixel, as shown in FIG. The directions of the contour pixels are defined in eight directions as shown in FIG. 7A, and are “north direction”, “northeast direction”, “east direction”, “southeast direction”, “south direction”, “southwest direction”. It consists of “direction”, “west direction”, and “north direction”.

  Specifically, for the direction of the contour pixel, the search is started from the upper left, which is the reference position of the image, and when the contour pixel of the divided area is found, the contour pixel is traced clockwise. At the time of tracing, there is a priority order for determining the direction of the contour pixel, and the directions of the contour pixel are “east”, “south”, “west”, “north”, “southeast”. , “Southwest direction”, “northwest direction”, and “north direction”.

FIGS. 7B to 7E show examples in which the direction of each contour pixel is examined for ten contour pixels.
In step S33, the total number of contour pixels in the direction and the total number of contour pixels in each direction are calculated, for example, for 10 contour pixels whose directions are examined.
The example of FIG. 7B is a case where all of the ten contour pixels indicate the “east direction”. In this case, since the directions of the contour pixels are all the same in the “east direction”, the total number of the directions is “1”. Further, the total number of contour pixels in each direction is only “10” in the “east direction”.

In the example of FIG. 7C, the total number of contour pixels indicating “north direction” among the ten contour pixels is “4”, the remaining contour pixels indicate “east direction”, and the total number is “ 6 ”. For this reason, the total number of directions is “2” for “north direction” and “east direction”. The total number of contour pixels in each direction is “4” for “north direction” and “6” for “east direction”.
In the example of FIG. 7D, similarly, the total number of directions is “3” of “east direction”, “southeast direction”, and “north direction”. The total number of contour pixels in each direction is “8” for “east direction”, “1” for “southeast direction”, and “1” for “north direction”.

In the example of FIG. 7E, the total number of directions is “3” in “east direction”, “south direction”, and “north direction”. The total number of contour pixels in each direction is “4” for “east”, “3” for “south”, and “3” for “north”.
In step S34, it is determined whether the calculated total number is 3 or more and the smallest total number of contour pixels in the calculated direction is equal to or greater than a set value. In this case, the contour pixels near the contour pixels included in the smallest total number are detected as defective pixels. In step S35, the defective pixel is output on the display screen of the display device 6.

Here, in the case where the set value is “1”, whether or not a defective pixel is detected in the case of FIGS. 7B to 7E will be described.
In the example of FIG. 7B, the total number of directions is “1”, and the total number of contour pixels for each direction is only “10”. In the example of FIG. 7C, the total number of directions is “2”, and the total number of contour pixels in each direction is “4” and “6”. Therefore, according to the examples of FIGS. 7B and 7C, defective pixels are not detected and output.

  On the other hand, in the example of FIG. 7D, the total number of directions is “3”, and the total number of contour pixels in each direction is “8”, “1”, and “1”. In the example of FIG. 7E, the total number of directions is “3”, and the total number of contour pixels in each direction is “4”, “3”, and “3”. Therefore, according to the examples of FIGS. 7B and 7C, defective pixels are detected and output.

(Explanation of color inspection of unique parts in each area)
Next, a specific procedure for color inspection of a specific portion in each region described in step S3 in FIG. 3 will be described with reference to FIG.
In step S41, a color image to be inspected and a color image after region division are input. In step S42, color reduction processing is performed on the color image to be inspected. In this color reduction process, for example, when each RGB data of a color image before color reduction is 8 bits, each 8 bits of RGB data is converted into 3 bits of data.

In step S43, the color distribution of the color image to be inspected after the color reduction process is checked for each divided area. In step S44, based on the examined color distribution, a pixel having a color outside the predetermined range is extracted as a pixel having a unique color.
In step S45, a connection of eight neighboring pixels around the extracted pixel is detected, and when the detected connection is greater than or equal to a set value, a block larger than the set value is detected as a defective pixel. In step S46, the detected defective pixel is displayed and output on the display screen of the display device 6.

(Other embodiments)
(1) In step S25 of FIG. 5, the first resist region 801 is determined based on the difference in the value of the V component of the HSV components of each pixel in the region divided as a resist region at once. And a process of re-dividing into the second resist region 802.
However, this processing difference may be performed based on the difference in the value of one of the RGB components in the value of the V component of the HSV components of each pixel.

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Image processing device 3 Image memory 4 Storage device 5 Input device 6 Display device 8 Printed circuit board

Claims (10)

Image acquisition means for acquiring a color image of a printed circuit board obtained by imaging the printed circuit board to be inspected;
Area dividing means for dividing the obtained color image of the printed circuit board into a plurality of areas according to the difference in color;
Color inspection means for specifying a unique portion of the color in each of the divided areas;
Contour extracting means for extracting the contour of each of the divided areas;
Shape inspection means for inspecting the presence or absence of shape abnormality of each region based on each extracted contour,
A printed circuit board inspection apparatus comprising: Data specifying the shape of each area divided by the area dividing unit for a color image of one printed circuit board, and data specifying the shape of each area divided by the area dividing unit for a color image of another printed circuit board Compared with the area comparison inspection means for inspecting the quality of the shape of each area,
The printed circuit board inspection apparatus according to claim 1, further comprising: Based on the inspection result of each area inspected by the color inspection means, the inspection result of each area inspected by the shape inspection means, and the inspection result of each area inspected by the area comparison inspection means, the color of the one printed circuit board For a part of the areas divided by the area dividing unit for the image, the shape of a part of the areas divided by the area dividing unit for the color image of the other printed circuit board is set. Data update means to replace the data to be identified
The printed circuit board inspection apparatus according to claim 2, further comprising: Based on the color image acquired by the image acquisition unit, the inspection result of each region inspected by the color inspection unit, and the inspection result of each region inspected by the shape inspection unit, any of detection necessary information and detection unnecessary information Setting means for setting one of them,
In the case where the detection necessary information is set, the inspection necessary part is defective based on the set necessary detection information for the inspection result inspected by the color inspection means and the inspection result inspected by the shape inspection means. First processing means for processing as a non-part,
When the detection-unnecessary information is set, the detection-unnecessary portion is inferior based on the set detection-unnecessary information for the inspection result inspected by the color inspection unit and the inspection result inspected by the shape inspection unit. Second processing means for processing as a non-part,
The printed circuit board inspection apparatus according to claim 1, further comprising: The region dividing means includes
Representative color acquisition means for acquiring a representative color representing each of the areas set for each of a plurality of areas to be divided in the color image of the acquired printed circuit board;
Based on the color of each pixel of the color image of the printed circuit board, each representative color of the plurality of regions acquired by the representative color acquisition unit is referred to, and any one of the plurality of representative colors is assigned to each pixel. First dividing means for changing a color and dividing an area;
Of the areas divided by the first dividing means, a second dividing means for re-dividing a predetermined area in accordance with a difference in color brightness of the area;
The printed circuit board inspection apparatus according to claim 1, further comprising: A first step of acquiring a color image of a printed circuit board obtained by imaging the printed circuit board to be inspected;
A second step of dividing the color image of the printed circuit board acquired in the first step into a plurality of regions according to a difference in color;
A third step of identifying a unique portion of the color in each region divided in the second step;
A fourth step of extracting the contour of each region divided in the second step;
A fifth step of inspecting whether there is an abnormality in the shape of each region based on each contour extracted in the fourth step;
A printed circuit board inspection method comprising: A printed circuit board inspection method for inspecting a plurality of identical printed circuit boards,
A first step of acquiring a color image of a printed circuit board obtained by imaging the printed circuit board to be inspected;
A second step of dividing the color image of the printed circuit board acquired in the first step into a plurality of regions according to a difference in color;
A third step of identifying a unique portion of the color in each region divided in the second step;
A fourth step of extracting the contour of each region divided in the second step;
A fifth step of inspecting the presence or absence of an abnormality in the shape of each region based on each contour extracted in the fourth step,
When inspecting one printed circuit board, each process from the first to fifth steps is performed,
In the case of inspecting another printed circuit board, the process of the sixth process is included in addition to the processes of the first to fifth processes,
In the sixth step,
The data specifying the shape of each region divided in the second step for the color image of the one printed circuit board is used as the shape of each region divided in the second step for the color image of the other printed circuit board. A method for inspecting a printed circuit board, wherein the quality of each region is inspected for quality compared with data for specifying When inspecting the other printed circuit board, in addition to the processes from the first to sixth processes, the process of the seventh process,
In the seventh step,
The one printed circuit board based on the inspection result of each region inspected in the third step, the inspection result of each region inspected in the fifth step, and the inspection result of each region inspected in the sixth step As for a part of each region divided in the second step for the color image, a part of each region divided in the second step for the color image of the other printed circuit board. The printed circuit board inspection method according to claim 7, wherein the printed circuit board inspection method is replaced with data for specifying a shape of the region. When inspecting the other printed circuit board, in addition to the processes from the first to the seventh process, the process of the eighth process is included between the process of the sixth and the seventh process. West,
The eighth step includes
The third color image obtained in step, the inspection result of each area were examined in the fifth step, and on the basis of the sixth test results of each region examined in the step, the necessary information and detection unnecessary information detect A determination step of determining whether or not one of these is set;
When it is determined that the detection necessary information is set, the inspection result inspected in the fifth process and the inspection result inspected in the sixth process are based on the set detection necessary information. A first processing step for processing the necessary detection part as a defective part;
When it is determined that the detection unnecessary information is set, the inspection result inspected in the fifth process and the inspection result inspected in the sixth process are based on the detection unnecessary information set. A second processing step of processing the unnecessary detection portion as a non-defective portion;
The printed circuit board inspection method according to claim 8, comprising: The second step includes
A representative color acquisition step of acquiring a representative color representing each of the regions set for each of a plurality of regions to be divided in the color image of the printed circuit board acquired in the first step;
Based on the color of each pixel of the color image of the printed circuit board, the representative colors of the plurality of regions acquired in the representative color acquisition step are respectively referred to, and any one of the plurality of representative colors is assigned to each pixel. A first dividing step of changing the color and dividing the area;
Among the areas divided in the first dividing step, a second dividing step of re-dividing a predetermined area according to a difference in brightness of the color of the area;
The printed circuit board inspection method according to claim 6, further comprising:

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