How would you identify specific points in an image based on the pixels around the point(s) that you wish to identify?
For example, if I had an image with lots of different colors but I only wanted to find the blue areas which are next to green areas and ignore everything else.
I'm sure the first step in this example would be to pass a filter over the image to remove all colors apart from green and blue but I wouldn't know where to go from there in eliminating green and blue parts which are not adjacent.
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