Image translation using fourier transform

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Asrith Pyla
Asrith Pyla 2020-6-1
编辑： Rafael S.T. Vieira 2020-6-5
I have shifted an image by certain pixels in the Fourier (frequency) domain and brought it back to the time domain. My question is if the noise associated with my image before translation is same as the noise associated with it after translation.

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回答（1 个）

Rafael S.T. Vieira
编辑：Rafael S.T. Vieira 2020-6-1
It depends on how you are performing the shift. Why don't you just measure it using psnr?
>>psnr(image_after, image_before)
If the two images, before and after some operation, are equal, the function psnr will return Inf.
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Asrith Pyla
Asrith Pyla 2020-6-5
Is there a way to measure noise power in MATLAB
Rafael S.T. Vieira
Rafael S.T. Vieira 2020-6-5
编辑：Rafael S.T. Vieira 2020-6-5
The Signal Processing Toolbox seems to have some functions for it, Asrith, but since I still don't have such Toolbox, I can't give you a more accurate answer. https://www.mathworks.com/help/signal/spectral-analysis.html (That's assuming we have the data obtained by some device such as a Psophometer).

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