MATLAB: How to find intensity of am image

discrete mathematicsfourierimage intensity

i have an target image and trying to find image intenstiy of that but i am not able to find that if anyone could help me out that ill be great thanks

I = imread(myimage) ;
iwant = mean(I(:));

Function impixel works for grey images too. For such an image, all three RGB values will be the same.

The mean of a particular pixel is just simply the pixel value, since there is only one sample - nothing really to take the mean of:

intensityValue = grayImage(100, 230); 
meanIntensityValue = mean(grayImage(100, 230));

Here, of course meanIntensityValue will equal intensityValue.

To get the mean of all the pixel values in the entire image, you can do any of these:

meanIntensityValue = mean2(grayImage);
meanIntensityValue = mean(grayImage(:));
meanIntensityValue = mean(mean(grayImage));