How to find intensity of selected region in an image?

Hi,

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?

Thanks,

Deepak Sivadas Menon

Answer 1

[Image Analyst]

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.

imshow(grayImage);
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.