Finding the mean and standard deviation

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kash
kash 2012-8-30
I is an rgb image
d = unique(I);
out = [];
for jj = 1:numel(d)
r = bwconncomp(I == d(jj),4);
out = [out;[repmat({d(jj)},r.NumObjects,1) r.PixelIdxList']];
end
and i get output as(below is example some part of output)
[ 44] [ 1x3 double]
[ 46] [ 1x3 double]
[ 19] [ 1x3 double]
[ 44] [ 1x3 double]
[ 20] [ 1x3 double]
[ 43] [ 1x3 double]
[ 19] [ 1x3 double]
[ 39] [ 1x3 double]
[ 41] [ 1x3 double]
[ 20] [ 1x3 double]
[ 40] [ 1x3 double]
[ 41] [ 1x3 double]
[ 21] [ 1x3 double]
[ 42] [ 1x3 double]
for each block i have to find the mean and standard deviation ,please help

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回答（1 个）

Image Analyst
Image Analyst 2012-8-30
Post this as a follow up to the original question at http://www.mathworks.com/matlabcentral/answers/46552-grouping-the-pixel-having-same-values I don't even know what you mean by the mean. Each "block" has the value d(jj) so that's the mean, and of course the std dev would be zero.
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Image Analyst
Image Analyst 2012-8-30
Again, since each block is a unique color, the mean color should be that color and the SD should be zero. Isn't that right?
kash
kash 2012-8-31
for example
I=imread('rice.png');
C = mat2cell(I,[128 128],[128 128]);
meanValues = cellfun(@(x) mean(x(:)),C)
meanValues =
131.3774 129.7532
94.9357 88.9209
so for each block i get mean values ,is it possible to do the same for my problem

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