Trying to find extraneous points on in an image using a histogram to find cut off

Hello, I am trying to find the hot pixels in an image by using a histogram to see the cut off. There are a few hot pixels amongst the 1000 by 1000 image therefore to see the cut off I need to take take the log of the number of counts in each bin of the histogram. How do I plot such a histogram thanks in advance!

Answer 1

[Image Analyst]

Just use histogram() or imhist():

[counts, grayLevels] = imhist(grayImage, 256);
bar(grayLevels, counts, 'FaceColor', 'b', 'BarWidth', 1);

If you want to take the log of the counts, do so

[counts, grayLevels] = imhist(grayImage, 256);
bar(grayLevels, log(counts+1), 'FaceColor', 'b', 'BarWidth', 1);