how to find Windowed Fourier Transform of an image? If possible function script is needed.

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ruchitesh
ruchitesh 2014-2-8
评论： Spandan Tiwari 2014-2-10
Windowed fourier transform of an image is required. Is it same as STFT? Script for that is required. Thank you.

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Spandan Tiwari
Spandan Tiwari 2014-2-8
STFT computation requires computing Fourier Transform of sub-blocks of the image. You can use fft2() to get Fourier Transform. For breaking the image in overlapping or non-overlapping blocks and processing each block, look at the function blockproc() in the Image Processing Toolboxs It can take care of dividing the image into sub-blocks and putting the output back together after computation.
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ruchitesh
ruchitesh 2014-2-8
Thank you very much Mr.Tiwari. It would be very helpful if you can guide little more. Actually section of the WFT(circular window with r=16) at 10x10 location is required. can you tell me how to implement this?
Spandan Tiwari
Spandan Tiwari 2014-2-10
Ruchitesh,
From your question it sounds as if you are trying to find a Windowed FT around just one pixel ((10,10)? ). Is that correct? Or are you trying to find STFT for the entire image,going block-by-block? If its the former it is much easier.

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