calculation of first order histogram

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how to find first order histogram by
The first-order histogram P(I) is defined as: number of pixels with gray level I/total number of pixels in the region
from this i have to find mean ,standard deviation etc,
i can find those ,but plz tell how to calculate first order histogram

Accepted Answer

Image Analyst
Image Analyst on 18 Aug 2013
I know it sounds obvious, but did you try hist()?
[counts, binCenters] = hist(data);
P = counts/sum(counts);
meanValue = (counts .* binCenters) / sum(counts);
I presume you know how to get SD from the histogram.

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