MATLAB: How can i detect contours properly

contour - extractImage Processing Toolbox

hello everyone , i have tried to detect contours and extract contours of this image but it doesn't work properly for detecting all contours (canny , log ..) , have tried also to make it binary also any suggestions will be appreciated

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The image looks binary so it doesn't really have contours. The only "contour" is the boundary between pure black and pure white. Try bwboundaries() or bwperim() to get the edge pixels.

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MATLAB: Fill holes in binary Image

You could try imclose() followed by imfill()

se = strel('disk', 20, 0);
mask = imclose(mask, se);
mask = imfill(mask, 'holes');
imshow(mask);

or you could try an active contour, like the attached demo.

There are fancier ways if you want to make sure the outer boundary doesn't change, but it's more work and I don't have time for that now. See if one of the two methods I gave above works OK for you.

MATLAB: How can i label pixels of contour

bwlabel()

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MATLAB: Fill holes in binary Image

MATLAB: How can i label pixels of contour

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