sharpening or cleaning this binary mask

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rsnandi 2020-7-31

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评论： Image Analyst 2020-8-7

BW!1.png

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.

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jonas 2020-7-31

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 2020-8-1

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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Answer 1

Image Analyst 2020-8-1

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在 MATLAB Online 中打开

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.