mmdPotatoes
Grade potato quality by shape and skin spots.

The input image is read.

Image a = mmReadgray("potatoes.tif");
mmShow(a);

a

Convert to binary objects by thresholding

Image b = mmThreshad(a,90);
mmShow(b);

b

The binary image is thinned and the result overlayed on the original image

Image c = mmThin(b);
mmShow(a,c);

a,c

To detect the skin spots, a closing tophat can enhance the dark areas of the image

Image d = mmCloseth(a,mmSedisk(5));
mmShow(d);

d

The tophat is thresholded and the result is masked with the binary image of the potatoes as we are interested only on the spots inside them

Image e = mmThreshad(d,20);
Image f = mmIntersec(e,b);
mmShow(f);

f

Show both results: skeleton and skin spots overlayed on the original image

mmShow(a);
mmShow(a,f,c);

a	a,f,c