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PIV: fft cross-correlation with large searchwindow

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Old   April 11, 2005, 14:39
Default PIV: fft cross-correlation with large searchwindow
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Hi! I am now compiling a PIV code, the problem with my FFT method is that when I use a small interogate window and a larger search window, I padded zeros of int_window in order to make the complex conjugate multiplication of fft of the two matrix. However, a problems occurs that I can substracted the mean of int_window in advance, but how about the demean and normalization factor of the search window? Here, what I am interested is the local mean and deviation of search window, which part would overlap with moving int_window when doing cross-corrleation via fft.

do I make myself understood? please help if you have used the same algorithm.
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