mmdgear
Detect the teeth of a gear

The binary image of a gear is read.

a = mmreadgray('gear.tif');

mmshow(a);

a

Opening of the input image by an Euclidean disk of radius 20. The sequence opening-subtraction is called opening top-hat. The opening top-hat could be executed in a single command: c = mmopenth (a,mmsedisk (20));

b = mmopen(a,mmsedisk(20));

mmshow(b);

c = mmsubm(a,b);

mmshow(c);

b	c

The teeth detected are labeled. The maximum pixel value in the labeled image gives the number of connected objects (n. of teeth).

d = mmlabel(c);

nteeth=mmstats(d,'max')

mmlblshow(d,'border');

d,'border'