Automatic Defect Detection | Python OpenCV 

This will work with any PCB that has a square or rectangular shape. Although I don't think it would take much to allow for this to work for any PCB shape. Thanks for the idea!

I'm using absdiff which isn't all that robust. That's why I have a fixture to ensure each PCB will be in the exact same position. I have a 2nd version that doesn't need a fixture and automatically rotates the PCBs to be in the same position but its defect detection is more noisy. Thanks for asking!

@@jared-horton thanks for sharing. Appreciate it👍👍👍

That's a great question. The overlay feature allows you to see a ghost image of the reference board so you can align them pretty well. However there is still room for human error in the manual alignment. I have a new version that uses image registration to automatically align the reference and inspection images. But it's a work in progress. Maybe it's time I upload another video!

@@jared-horton Oh ok - so its work in progress :) - i thought there are some reference points and so on that the image could be scaled and aligned to.. I dont get what do all these intersecting gear lines do (saw-lines)

The gears are part of a fixture mechanism that I intended to use to hold the pcb in a certain position. The fixture can fit any sized rectangular PCB. But now that I have auto alignment implemented, I can get rid of the fixture

Yep!

I'm using a USB microscope camera with a C-mount lens. This kind of setup is very common for PCB inspection

I'm glad you find his project interesting! It uses a microscope camera. I believe this camera cost ~$300 but you could get a better camera for cheaper. I haven't made this into a product since its not robust enough, but the idea interests me

I used a microscope usb camera with a C mount lens. This kind of setup is very common for PCB inspection, but unfortunstely they can be expensive, around $300 but you can find cheaper ones with great quality for around $200 on Amazon. Glad you enjoyed it!

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