sharpening or cleaning this binary mask

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rsnandi on 31 Jul 2020
Commented: Image Analyst on 7 Aug 2020
Hi, Image Analyst.,Could you please help me in sharpening or cleaning this binary mask please which is attached here. I have tried alot and got this refinement only. please suggest something.
jonas on 31 Jul 2020
I am not image Analyst, but I'm guessing you will get a better answer if you describe your desired image. Personally I don't see a lot of noise in your image. Do you want smoother edges? Do you want to fill the small black areas inside the main blob?
rsnandi on 1 Aug 2020
Thanks Jonas , yes I want to smoother edges and fill the black area inside the main blob. Morphological operations not doing good. They deform the main blobs. Please suggest something. Thanks

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Answers (1)

Image Analyst
Image Analyst on 1 Aug 2020
You could blur the image and threshold it.
windowWidth = 7; % Whatever - bigger gives more smoothing, experiment with different values.
kernel = ones(windowWidth, windowWidth) / windowWidth^2;
smoothBW = conv(single(bw), kernel, 'same') > 0.5;
Or you could use a savitzky Golay filter to smooth the boundaries and then use poly2mask on the smoothed boundaries. Demo attached.
Or you could use activecontour(). Demo attached.

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