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Find CDF in image

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Dani D
Dani D 2016-5-2
评论： Image Analyst 2016-5-2
Hello, I have an image and i want use CDF function for find CDF 0.5. How can use CDF function in matlab? I read help but i can't understand well. Thanks
I = imread('cameraman.tif');
%%FIND CDF 0.5 for this image.

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回答（1 个）

Image Analyst
Image Analyst 2016-5-2
Perhaps something like this to find the cumulative distribution function (integral of the histogram):
counts = histcounts(grayImage);
cdf = cumsum(counts)/sum(counts);
  2 个评论
Image Analyst
Image Analyst 2016-5-2
Dani's "Answer" moved here because it's a comment to me rather than an Answer to her original question:
Thanks, But CDF 0.5 is point which half pixel is left and half pixel should right. CDF 0.5 is one point (is pixel)
Image Analyst
Image Analyst 2016-5-2
Not sure what that means exactly, but if you want the median value you can use
medianValue = median(I(:));
You should get close the the same value if you use find on cdf
medianValue = find(cdf >= 0.5, 1, 'first');

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