working hit-or-miss implementation

asked Feb 13 '14

kamilk
1 ●1

updated Sep 30 '16

pklab

4284 ●7 ●30 ●60

I need an implementation of hit-or-miss transform done in OpenCV. Searching the internet, all I found is this program on opencv-code.com. The implementation, however, is broken. As an example, take the kernel

0 0 0
0 1 0
0 0 0

That is, a one in the middle and don't-cares everywhere else. The expected behaviour would be to simply copy the input image and that's what the MATLAB function bwhitmiss does. The provided snippet, however, zeros a few values.

Original:

 [0, 0,  0,  0,  0, 0, 0,  0;
  0, 1,  1,  1,  0, 0, 0,  0;
  0, 1 , 0, *1*, 0, 0, 0,  1;
  0, 1, *1*, 1,  0, 1, 0,  0;
  0, 0 , 1,  0,  0, 0, 0,  0;
  0, 0,  1,  0,  0, 1, 1,  0;
  0, 1,  0, *1*, 0, 0,*1*, 0;
  0, 1, *1*, 1,  0, 0, 0,  0]

Hit-and-miss result:

 [0, 0,  0,  0,  0, 0, 0,  0;
  0, 1,  1,  1,  0, 0, 0,  0;
  0, 1,  0, *0*, 0, 0, 0,  1;
  0, 1, *0*, 1,  0, 1, 0,  0;
  0, 0,  0,  0,  0, 0, 0,  0;
  0, 0,  1,  0,  0, 1, 1,  0;
  0, 1,  0, *0*, 0, 0,*0*, 0;
  0, 1, *0*, 1,  0, 0, 0,  0]

Does someone have an idea for a fix?

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Mat kernel; // Define your kernel Mat negkernel; bitwise_not(element,negkerne); negkernel = negkernel- 254; Mat erode; Mat negerode; morphologyEx(img, erode, MORPH_DILATE, kernel); morphologyEx(negerode, negerode, MORPH_DILATE, negkernel); Mat output; bitwise_or(erode,negerode,output);

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