How to calculate pixel with same gray value are labeled with same number,for each kernal in the image?

How to calculate pixel with same gray value are labeled with same number,for each kernal in the image?

Answer 1

[Image Analyst]

I have no idea what you mean so all I can suggest is this: http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

You did not attach your image so I can't imagine what "each kernal in the image" means. Are you analyzing popcorn? And if your image is already labeled so that each blob has it's own unique ID number (label) then what does "calculate pixel" mean ? What is there to calculate???

[Akshay Gore]

[Image Analyst]

You can do this with conv2() and stdfilt() in the Image Processing Toolbox to get mu and sigma in a sliding 3*3 window.

meanImage = conv2(double(y), ones(3)/9, 'same');
stdDevImage = stdfilt(double(y), ones(3));
zImage = (y - meanImage).^2 ./ (2*stdDevImage .^ 2);
firstSum = sum(zImage(:))
logSigmaImage = log(stdDevImage);
secondSum = sum(logSigmaImage(:))

I'm not exactly sure what x is. I don't know if it's the pixel value in the window (essentially the same as y), or if you have a labeled matrix calculated in advance. Can you explain more about x?