MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guide de l'utilisateur télécharger pdf (Page 141)

CountingObjectsinanImage

In this ex ample, you im port an intensity imag e of a wheel from the MATLAB

workspace and convert it to binary. Then, using the Opening and Label blocks,

you count the number of spokes in the wheel. You can use similar techniques

to count objects in other intensity imag es. However, you might need to use

additional morphological operators and different structuring elements:

1 Define an intensity image in the MATLAB workspace. To read in an

intensity image from a PNG file, at the M ATLAB command prom pt, type

I= imread('testpat 1.pn g');

is a 256-by-256 matrix of 8-bit unsigned integers.

2 To view the image this matrix represents, at the MATLAB command

prompt, type

imshow(I)

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MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guide de l'utilisateur Page 141