#
vcm

## F2QCorr

Script call for filter F2QCorr is:-

## vcm.F2QCorr(clip,bclip clip,[ int cx = 20[,int cy = cx] [,int txt = 0][,data filename] ] )

clip: YUV, GRAY, RGB24 constant formats only allowed.
bclip: must have identical format to that of clip and should be of equal length.
cx:, cy:search window half width.and height will search for correlation maximum in this frame centered window with left top at (-cx, -cy) and right bottom at (cx,cy).
txt: if set to 1, outputs coordinates of maximum correlation to a file in text format .
filename: if txt is set to 1, a valid file name with full path must be given.

Cross Correlates frames of two input clips A and B in 2D Freq domain. The orrelation is displayed in space domain as the output frame. If txt is set to 1, a valid filename with full path must be given. Limiting up to the first 1000 frames, it measures the shift between the corresponding frames of the two clips within a window of plus minus cx and cy at center of frame. Frame numbers Fn, x, y values of shifts determined within this window and fx and fy values of shift within fullframe are recorded in a text file at the end of all processing and closing of script. Normally these values should be identical but in certain repeating patterned clips clips they can be different.

This transforms data into frequency domain utilising libfftw3f-3.dll ( or, FFTW3 dll, or fftw.dll) of fftw.org being available in path.