PCB Image Detection in GUI

2020 5 20
3 个回答
更新时间：2023 2 8
132 次查看（30 天）

0 个投票

Hi, I'm trying to create a GUI to detect the defects in PCB. The image shown is the reference image that I would wish to create but I failed to search for any references to create the green boxes as detection and determine the type of defects in GUI. I'm wondering if there are any references I could refer to?

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KIVANÇ mutlu
KIVANÇ mutlu 2020-5-30
I made comparison of fixed pcb images but XOR comparison does not work on samples from different locations. I need to first identify the PCB location using the fiducial reference. I want to teach fiducial points. Then he will search for these points in certain areas and determine his coordinate. According to the first reference, the periodic, that is, sliding of the pcb is determined.
Image Analyst
Image Analyst 2020-5-30
KIVANC, how/where did you get his images? I don't see that he posted them.
Anyway, did you try imregister()? And can you post/attach his images?
Lee Hao Nam
Lee Hao Nam 2020-5-31
编辑：Image Analyst 2020-5-31
Hey, I have managed to created the Boundary box around the defect using the lines of code below:
[L, num] = bwlabel(img3);
bboxes = regionprops(img3,'BoundingBox','centroid');
for k = 1:length(bboxes)
CurrBB = bboxes(k).BoundingBox;
rectangle('Position',[CurrBB(1),CurrBB(2),CurrBB(3),CurrBB(4)],'EdgeColor','g','LineWidth',2)
end
The current issue I am facing is how do I classify the types of defects
Image Analyst
Image Analyst 2020-5-31
I don't know what img3 is, but you need to look at the various features of each blob, like it's area, or perimeter, or circularity, or aspect ratio, or something like that.
Lee Hao Nam
Lee Hao Nam 2020-6-1
The images are as attached below.
img3 is the imabsdiff of the 2 images below
Image Analyst
Image Analyst 2020-6-1
OK, so please describe in words, what are the features that describe the various classes, and give the class names, like "nick", "complete break" or whatever.
Lee Hao Nam
Lee Hao Nam 2020-6-1
So the types of defects are such as:
1. Short
2. Open
3. Spurous copper
4. Mouse bite
5. Spur
The codes are as shown below up till the part where creating Bounding Boxes and texts
% Show Fig 1
a = uigetfile('*.*'); % Get all types of files
img1 = imread(a);
img1 = im2bw(img1);
figure()
imshow(img1);
% Show Fig 2
b = uigetfile('*.*'); % Get all types of files
img2 = imread(b);
img2 = im2bw(img2);
figure()
imshow(img2);
% Show Fig 3 of subtracted img1 and img2
figure()
img3 = imabsdiff(img1,img2);
imshow(img2);
[L, num] = bwlabel(img3);
bboxes = regionprops(img3,'BoundingBox','centroid');
% Obtain centroid of the boundary boxes
centroids = cat(1,bboxes.Centroid);
hold on
for k = 1:length(bboxes)
CurrBB = bboxes(k).BoundingBox;
rectangle('Position',[CurrBB(1),CurrBB(2),CurrBB(3),CurrBB(4)],'EdgeColor','g','LineWidth',2)
H= text( centroids(:,1)-9, centroids(:,2)-17,'types of defect'); % goes by column first then row
set(gcf,'DefaultTextColor','red')
end
hold off
edgar sanchez
edgar sanchez 2020-6-3
do you have the full project? Im doing this for school. Can you send it too me? the code.
gary.rage@gmail.com
Today is the due date :)
Image Analyst
Image Analyst 2020-6-4
edgar, I'm not sure who you're asking. I guess you're asking Lee. I don't have his code (other than the partial chunk above) and I don't know if he finished or not. All he did so far was to subtract the test image from the template/reference image and find differences and put boxes around them. He never said (despite me asking) what constitutes the 5 different types of defects, so the classification into those defects is not shown in the above code. Moreover, the code expects perfect alignment between the two images, which is not likely to happen in a real world situation. I'm dealing with that myself all week with my current project where a robot is supposed to move an object and end up back in the same position every time. It's close, but not perfect. It's not aligned perfectly to the nearest pixel so there are "edge effects" that show up a little thin lines along the edges where they did not subtract perfectly and we need to handle those.

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回答（3 个）

Image Analyst
Image Analyst 2020-5-20
编辑：Image Analyst 2020-5-20

0 个投票

You can use
hold on;
rectangle('Position', [x, y, width, height], 'EdgeColor', 'g');
to create green rectangles.
See this link for algorithms: http://www.visionbib.com/bibliography/contentschar.html#KK11219
For examples:
Bley, H.[Heinrich],
Segmentation and Preprocessing of Electrical Schematics Using Picture Graphs,
CVGIP(28), No. 3, December 1984, pp. 271-288.
Elsevier DOI BibRef8412
Fukada, Y.[Youji],
A Primary Algorithm for the Understanding of Logic Circuit Diagrams,
PR(17), No. 1, 1984, pp. 125-134.
Elsevier DOI BibRef8400
Thalmann, D.[Daniel], Demers, L.P.[Louis-Philippe], Magnenat-Thalmann, N.[Nadia],
Locating, Replacing, and Deleting Patterns in Graphics Editing of Line Drawings,
CVGIP(29), No. 1, January 1985, pp. 37-46.
Elsevier DOI BibRef8501
Okazaki, A., Kondo, T., Mori, K., Tsunekawa, S., and Kawamoto, E.,
An Automatic Circuit Diagram Reader with Loop-Structure-Based Symbol Recognition,
PAMI(10), No. 3, May 1988, pp. 331-341.
IEEE DOI Application, Circuit Diagrams. Recognize Symbols. BibRef8805
Fahn, C.S.[Chin-Shyurng], Wang, J.F.[Jhing-Fa], Lee, J.Y.[Jau-Yien],
A Topology-Based Component Extractor for Understanding Electronic Circuit Diagrams,
CVGIP(44), No. 2, November 1988, pp. 119-138.
Elsevier DOI Application, Circuit Diagrams. Automatic contour following based on the patterns that can appear. BibRef8811

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Lee Hao Nam
Lee Hao Nam 2020-5-23
alright, thank you for the references. Will try to get around it

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Giselle Roy
Giselle Roy 2020-6-10

0 个投票

hmm @Lee did you try using the CNN object detector, try classifying each defect based on it perimeter turn radius or if you have any other approach send it in, i may be able to solve it
Abi
Abi 2023-2-8

0 个投票

Code please

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Image Analyst
Image Analyst 2023-2-8
编辑：Image Analyst 2023-2-8
To learn how to write MATLAB code, invest 2 hours of your time here:
MATLAB Academy - Free 2 hour training
DGM
DGM 2023-2-8
编辑：DGM 2023-2-8
I don't know about you, but I learned as a child that saying "gimme" without actually saying what you want isn't really a successful strategy.
If you want to post an answer, post one. If you want to ask a question, ask one. This is neither. Decide what you want to do.

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