Loren on the Art of MATLAB

Turn ideas into MATLAB


Loren on the Art of MATLAB has been archived and will not be updated.

End of Year Suggestion: Steve on Counting

I just read the latest post on Steve Eddins image processing blog. I recommend you read it too. It discusses how to count objects in an image without introducing bias. It would be easy to count all the blobs you see, including partial ones cut by the border. But that would be an overestimate. So how do we get a better estimate?


Counting Via Each "Lower Right Corner"

The first technique Steve discusses is one I am familiar with already. The basic idea is to count all objects that don't touch any edges of the image, and only count objects if they touch two adjacent edges, say the north and west ones, equivalent to counting objects via the "lower right corner". That will, statistically speaking, give you an unbiased estimate of the count.

Weighted Count of Interior Objects

The second method instead does a weighted count of only the objects that touch no edges. The weighting accounts for the relative likelihood for an object of that size to encounter an edge from a particular view. See Steve's code and explanation to learn more of the details.

Published with MATLAB® R2012b

  • print


댓글을 남기려면 링크 를 클릭하여 MathWorks 계정에 로그인하거나 계정을 새로 만드십시오.