MATLAB: Image segmentation of a fringe pattern image to extract the fringe area

Image Processing Toolboximage segmentation; fringe pattern

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Can you post a screenshot where you outline exactly what region(s) you want to segment? One way might be to use a texture filter like stdfilt(). This would give you a binary mask of just the smooth fringe parts. It's not computationally expensive - not sure why you said that. Did you actually try it? It should finish in a fraction of a second.

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MATLAB: I am converting a grayscale signature image to thin image but not getting the desired output

It looks like you need to clean up the binary image a little before thinning.

This worked for me:

bw = im2bw(img,graythresh(img));
% remove some of the noisy edges in the mask.
bw_clean = imopen(bw, strel('disk',1));
% remove small foreground objects.
bw_clean = bwareaopen(bw_clean, 25);
% invert the image and thin it.
bw_thin = bwmorph(imcomplement(bw_clean), 'thin', Inf);

MATLAB: Segment the image into separate objects

Use imfreehand() followed by poly2mask().

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MATLAB: I am converting a grayscale signature image to thin image but not getting the desired output

MATLAB: Segment the image into separate objects

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