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printed circuit board component image recognition

asked 2016-03-02 10:33:51 -0500

cbrake gravatar image

Hi,

I would like to use opencv to detect printed circuit board components in a camera image. What technologies/approaches would you advise? Thus far I've tried simple template matching with CV_TM_SQDIFF_NORMED. It works somewhat for small components (like a surface mount capacitor), but for larger components with more detail it does not very well, and overall is very sensitive to threshold settings, etc.

Thanks, Cliff

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Are you trying to identify them, or just detect them?

Tetragramm gravatar imageTetragramm ( 2016-03-02 19:18:29 -0500 )edit

need to identify components

cbrake gravatar imagecbrake ( 2016-03-02 21:13:49 -0500 )edit

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answered 2016-03-03 01:55:16 -0500

Pulkit gravatar image

You will have to use classification approach towards the object detection in PCB.Either you can use Haar Cascade but i believe here is gonna be too much false positive in haar cascade detection. Another option is you will have to use some image processing techniques(do a little literature survey) and after use some state of the art classifiers like random forest or svm or any other.In my opinion template matching might not be very robust. :)

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thanks for the thoughts -- template matching is proving to work somewhat, but requires a lot of threshold adjustments from one problem to the next, so is no real practical for real work use.

cbrake gravatar imagecbrake ( 2016-03-03 12:20:14 -0500 )edit
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answered 2016-03-02 21:38:08 -0500

Tetragramm gravatar image

Alright, there are several options. The usual ones are creating a Cascade Classifier or a Bag Of Words categorizer. There are good tutorials on each of these available.

I would also suggest, since it's quick to test, segmenting the component then using huMoments to compare to your dictionary.

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thanks for the ideas!

cbrake gravatar imagecbrake ( 2016-03-03 12:19:07 -0500 )edit

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Asked: 2016-03-02 10:33:51 -0500

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Last updated: Mar 03 '16