I need to find the black spot present in the component image and produce output based on the presence of black spot in the component .. please help me with what methods should i use and code to do it

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Image Analyst
Image Analyst on 26 Dec 2014
Just threshold the red channel and call bwlabel(). See attached code.
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Image Analyst
Image Analyst on 30 Sep 2017
That would be an indexed image, if it's pseudocolored. But basically it's the same concept. Flat field correct the image to compensate for lens shading, then identify the background (hopefully it's smooth), perhaps by thresholding, or thresholding after some processing, like running it through stdfilt() to identify smooth and not-smooth regions.

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