How to find intensity of selected region in an image?

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Pls help me in finding intensity of a specific region within a gray scale image.
Suppose I have two objects in an image. I am intersted in knowing the intensity of those two objects.
Also, is there a mechanism that shows the intensity values of the image when dragging cursor over the image?
Deepak Sivadas Menon

Risposta accettata

Image Analyst
Image Analyst il 21 Nov 2018
Yes. Assuming you have a binary image mask with two regions in there, and a gray scale image "grayImage", do this:
props = regionprops(mask, grayImage, 'MeanIntensity');
allIntensities = [props.MeanIntensity]
To see the intensity as you mouse around over the image, right after you show it with imshow(), call impixelinfo.
hp = impixelinfo();
% To set location of the status bar
hp.Position = [0.2, 0.4, 0.03, 0.4]; % xLeft, yBottom, width, height, all normalized 0-1.

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