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

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Sohail 2015-9-17

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评论： Image Analyst 2015-9-18

采纳的回答： Anand

after applying the im2bw(img,graythresh(img)) function i get the following image

but the image is not smooth enough after applying thining on the said image i get the following

so how to get rid of extra roots from the thin image and get smooth signature skeleton

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Anand 2015-9-17

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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);

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Image Analyst 2015-9-18

imfill() will fill completely surrounded holes and leave exterior boundaries unchanged. imclose() will fill interior holes and will smooth out exterior boundaries.