as the entropy of the image can be obtained by entropy filter as image ,can i get the image that shows the maximum energy pixels in the original gray image.
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The pixel intensity is the energy. If you don't know why, ask me to explain why. You can get the max by doing this:
maxGrayLevel = max(grayImage(:)); % Get the max energy of a pixel.
If at any point the range of frequencies you want to calculate the energy over includes either 0Hz or the Nyquist frequency, then you will not be multiplying those amplitudes by 2. Otherwise the above should work. You need to multiply the sum of squared amplitudes by the frequency increment (df) as I do above because you are essentially performing discrete integration across the interval between 10Hz and 90Hz.
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