mmdAsp
Detect the missing aspirin tablets in a card of aspirin tablets.

The aspirin tablet binary image is read.

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

a

The image can be model as a topographical surface where white regions corresponds to high altitude and dark regions to lower altitute. The regional maxima of the image is normally very noisy as can be seen below.

Image b = mmSurf(a);
mmShow(b);
Image c = mmRegmax(a, mmSebox());
mmShow(b, c);

b	b, c

Opening the original image by a disk a little smaller than the tablets removes all the noisy regional maxima. The only regional maxima in the opened image are the aspirin tablets as they are the only regionally brighter regions of shape larger than the disk of radius 20 pixels.

Image d = mmOpen(a, mmSedisk(20));
Image e = mmSurf(d);
mmShow(e);
Image f = mmRegmax(d, mmSebox());
mmShow(e, f);

e	e, f

Here it is shown the input and output result. Note that the binary image of the aspirin tablets was obtained using just one parameter: the radius of the circular structuring element. The problem was solved as treating the image formed by circular bright regions.

mmShow(a);
mmShow(f);

a	f