Morphological skeleton opencv

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I want to get the skeleton image of a character and I have tried that from OpenCV.But it runs a never ending loop.Please help me with this.Here is my code.Thanks.

C#

bool done;
IplConvKernel* element = cvCreateStructuringElementEx( 3, 3,0, 0, CV_SHAPE_CROSS, NULL );
do
{
    cvErode(gray,erode,element,1);
    cvDilate(erode,temp,element,1);
    cvAbsDiff(gray,temp,temp);
    cvOr(skel,temp,skel,NULL);
    cvCopy(erode, gray, NULL);

done = (cvCountNonZero(gray) == 0);
} while (!done);

Posted 25-Mar-13 19:36pm

123ezone

Updated 25-Mar-13 19:37pm

v2

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nv3 · Answer 1 · 2013-03-25T22:22:00

From the name "gray" of your input image I assume that it is a gray scale image. Notice that an erode on a gray scale image delivers another gray scale image in which the anchor pixel is the minimum of all source pixels as overlayed by the structuring element. This minimum is not necessarily zero. After iteratively applying the erode operation you will end up with an image that has the minimum gray-level of your source image. Hence, the test on non-zero won't work.

Either binarize before doing the skeletonization or use a different test for stopping your iteration.