Matlab: Find a point in an image based on its surroundings

Question

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. JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

[0] I assume that you are looking for direct neighboring regions. [1] Since you are sure that the first step is to remove all colors except green and blue, i'll continue from there. [2] Next, all you need to do is to segment blue from [1] and turn that into logical map or a black/white image [3] dilate [2] to your desired size [4] then, segment green from [1] and turn that into a logical map or a black/white image [5] multiply [3] to [4], the leftovers would be the region that has green next to blue.