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Why centroid value is in float instead of integer?

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I have eight white blog images in black background. When i was calculate centroid of each i get float type answers about four decimal(320.1425).
I have a doubt in this. All the images in taken as a matrix form right. Then the centroid will be only as integer. But actually it is not, why?

Accepted Answer

Image Analyst
Image Analyst on 13 Jan 2014
Why do you think the centroid should be an integer? Is the average of two integers, 4 and 5, an integer? No - it's 4.5. So why should centroids be integer? You can round to the nearest integer if you want with the int32() function:
centroid_x_int = int32(centroid_x);

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