detection of paint defect in car door handles

asked 2018-02-27 03:31:01 -0500

hakan61750 gravatar image

updated 2018-03-01 04:28:04 -0500

berak gravatar image

I have to find paint defect in the door handles of the finishing project. Besides the software, I have to do lighting and photography myself. I give a few photographs as an example below. I would like advice on lighting and software. thank for help . (The red circle is not in the original picture. ) image description . Original picture image description.

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can you add an image without the red circle?

LBerger gravatar imageLBerger ( 2018-02-27 04:05:54 -0500 )edit

There is no out-of-the-box solution for this, but google scholar already provides tons of possible solutions!

StevenPuttemans gravatar imageStevenPuttemans ( 2018-02-27 04:47:51 -0500 )edit

Well, I think that if someone posts a question on a technical forum as it is, he deserves something different than 'try googling'. That said, my two cents:

  • Regarding lighing you can try to move to a different colospace. For example you can try to normalize luminance of your image converting into a YUV colorspace, then making a histogram equalization on the Y channel, then converting it back to RGB;
  • Regarding defect detection, I would try conversion to grayscale, contrast stretching (histogram), binary threshold and find contours with some filtering of results based on dimensions of your defect.
procton gravatar imageprocton ( 2018-03-01 05:56:27 -0500 )edit

Euhm wait @procton, that is certainly true, and what I said is not, go search on google, but just a quick link to several scientific publications that tackle this problem and that can provide a solution?

StevenPuttemans gravatar imageStevenPuttemans ( 2018-03-01 07:54:51 -0500 )edit

I read most of the academic articles. But the articles are working on sections where the error is(They do not work on the whole thing). These photos were ideal. In fact, there will be other items behind the door arm.

hakan61750 gravatar imagehakan61750 ( 2018-03-10 15:20:15 -0500 )edit