Obtain the mean all pixels above & below a threshold.

I want to find all pixels above a threshold in a gray scale image, I therefore use:

[ii,jj]=find(IM>(thresh));

Is there a way to find the mean value of all those pizels above the threshold (i.e. at locations ii,jj) without using for loop?

Answer 1

[Image Analyst]

Try it this way:

mask = grayImage > someThresholdValue;
theMean = mean(grayImage(mask))

mask is a 2D binary (logical) image.

grayImage(mask) is a vector (list of values.)

[Jason]

That what i was after, thanks.