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

Windowed fourier transform of an image is required. Is it same as STFT? Script for that is required. Thank you.

Answer 1

[Spandan Tiwari]

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.

[ruchitesh]

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]

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.