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power spectral density of image

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leo leonardo
leo leonardo 2011-2-12
评论： Anitha Thomas 2019-1-16
Hallo every one i need your help please
i want to calculate the power spectral density of an image (my image size is 256*256 und their pixel values between 0 and 2^8=256). i did not find in matlab how to calculate that for an image?
thank you for your help.

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回答（1 个）

Vieniava
Vieniava 2011-2-12
Try this:
imagesc( log10(abs(fftshift(fft2(Picture))).^2 ))
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OLGA BARRERA
OLGA BARRERA 2018-12-6
Hi,
I am having problem with the power spectral density of this image (circ2.tif), this is a 1024*1024
A = imread('circ2.tif');
imagesc( log10(abs(fftshift(fft2(A))).^2 ))
I only get an emply windows..
Thank you in advance for your help
Anitha Thomas
Anitha Thomas 2019-1-16
OLGA BARRERA
change the code like this
A = imread('circ2.tif');
A1=rgb2gray(A);
imagesc( log10(abs(fftshift(fft2(A1))).^2 ))

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