mmdpotatoes - Grade potato quality by shape and skin spots.

Description: The input image is a gray-scale image of several washed potatoes. The shape of the potatoes is analysed using skeleton feature and the skin spots are detected. These two features can be used to evaluate their visual quality.

The input image is read.

a = mmreadgray('potatoes.tif');
mmshow(a);

(a)

Convert to binary objects by thresholding

b = mmthreshad(a,90);
Warning: Converting image from scalar to uint8.
mmshow(b);

(b)

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

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

e = mmthreshad(d,20);
Warning: Converting image from scalar to uint8.
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)

[Top] [Up] [Prev] [Next]	[Up] [Basic Concepts] [Demonstrations] [Functions]
Copyright (c) 1998-2002 by SDC Information Systems