Measuring indentation in an object
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Image Analyst on 9 Jan 2013
Use the convex hull, bwconvhull(). Subtract the original image from the convex hull and call bwlabel
indentsBinaryImage = bwconvhull(binaryImage) - binaryImage;
[labeledImage, numberOfIndents] = bwlabel(indentsBinaryImage);
Amith Kamath on 9 Jan 2013
http://blogs.mathworks.com/steve/2011/10/04/binary-image-convex-hull-algorithm-notes/ and the convex hull concept would help. I suppose you need to isolate each blob using http://www.mathworks.com/help/images/ref/bwconncomp.html and then find it's convex hull, and then the number of black blobs inside the convex hull will give you the number of folds. Hope this helps!