I am converting a grayscale signature image to thin image but not getting the desired output
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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
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);
9 个评论
Sohail
2015-9-18
Hi Anand thanks for your response. let me ask you about the following image
here in the image there are some white pixels inside black stroke of the signature can we remove this by adding black pixels in place of white pixels inside the stroke
Walter Roberson
2015-9-18
imclose the object to fill the small holes.
Sohail
2015-9-18
Walter Roberson
2015-9-18
I would not do that. "Extra roots" is not well defined and "correctly thin" is not well defined. When it comes to signature verification, little turns can be characteristic, as can be stroke width.
However, you might find it interesting to dilate the object, then filter out small blobs such as with bwareaopen or bwareafilt, and then skeletonize it.
Walter Roberson
2015-9-18
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.
Image Analyst
2015-9-18
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