Problem with imhist function ?

I have a GUI made with GUIDE and I want to upload an image and then show a histogram to see the distribution of intensities. I have a pushbutton "upload", I store the image (I) and then I make it shown through imshow(I). Until now everything is ok. After that, I have a pushbutton which takes me to another GUI named "histogram". I use rgb2gray at the first GUI, so my image is ready to be shown in a histogram. I pass the variables needed (setappdata,getappdata) to the second GUI and I write imhist(Igray) . I can only see an empty histogram with the gray scale down on it. No histogram has been shown. What is wrong?

Answer 1

[Image Analyst]

When you do

[pixelCounts grayLevels] = imhist(Igray);

and then examine pixelCounts in the debugger, what are its values? Are all bins zero? Are they all zero except for 1 bin? What does "whos Igray" report back to you?

[Zahra Saman]

any one tell me about this problem please??