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I’m trying to find similar or equivalent function of Matlabs “Bwareaopen” function in OpenCV?
In MatLab Bwareaopen(image,P) removes from a binary image all connected components (objects) that have fewer than P pixels.
In my 1 channel image I want to simply remove small regions that are not part of bigger ones? Is there any trivial way to solve this?
Take a look at the cvBlobsLib, it has functions to do what you want. In fact, the code example on the front page of that link does exactly what you want, I think.
Essentially, you can use
CBlobResultto perform connected-component labeling on your binary image, and then callFilterto exclude blobs according to your criteria.