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

2 vues (au cours des 30 derniers jours)
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

Réponse acceptée

Anand le 17 Sep 2015
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 commentaires
Image Analyst
Image Analyst le 18 Sep 2015
imfill() will fill completely surrounded holes and leave exterior boundaries unchanged. imclose() will fill interior holes and will smooth out exterior boundaries.
Image Analyst
Image Analyst le 18 Sep 2015
Have you seen section of vision bib? It has handwriting algorithms.

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