How do I calculate the mean, maximum, minimum and std of the detected region of an image?

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vaishali 2013-9-7

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detected region in binary image

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vaishali 2013-9-7

编辑：Walter Roberson 2013-9-11

columnwise processed used function:

[xmax,imax,xmin,imin] = extrema(BW(:,i));

obtain Result:

[],[],[],[]

Randy Souza 2013-9-24

I have changed the question and description back to the original values.

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Image Analyst 2013-9-7

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Assuming img is your gray scale image, and BW is a binary image specifying the "detected region":

meanValue = mean(img(BW));
minValue = min(img(BW));
maxValue = max(img(BW));
stdDev = std(img(BW));

Those values refer to the values in your gray scale image, not the binary image.

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Image Analyst 2013-9-8

编辑：Image Analyst 2013-9-8

My answer is very confusing now because you removed the edited the original subject and body so that it's now a totally different question. I'd recommend not doing that again. It would have been better to just add a followup question here or start a totally new discussion.

You're not using active contours and I don't even know what your loop is now trying to do. Are you trying to find the first and last place on each line where the binary image is true (1)? Or the distance between them?