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'