How can i plot Histogram for this??

How can i plot histogram for an image with 3 bins, where the bins holds the pixel values falling in the region 0-40, 41-90, 91-255. Also how can i write these stats, as in the number of pixels in each of those regions. Plz Help ?

Answer 1

[Image Analyst]

Try

edges = [0,41,91,255];
pixelCounts = histcounts(grayImage(:), edges);

[dp sb]

Thank You! I do get the pixel counts with that but now how can i get the histogram with the same 3 bins ??

[Image Analyst]

pixelCounts is the histogram. Or do you mean how to display it? Try the bar function

bar(pixelCounts, 'BarWidth', 1, 'FaceColor', 'b');

[dp sb]

It works. Thank You!

[Steven Lord]

Or call HISTOGRAM instead of HISTCOUNTS. If you want both the counts and the graphics object, call HISTOGRAM with an output argument and take a look at the properties of that graphics object.