FFTQuiver

FFTQuiver plugin for Avisynth 2.5+ is free for use, under GPL with no gaurentees or warranties neither explicit nor implied. Use of this plugin is entirely at users risk.

FQuiver and FFTQuiver plugins are similar except that FQuiver is self contained while FFTQuiver requireslibFFTw3f-3.dll or FFTw3.dll or fftw.dll, and is faster. FFTQuiver plugin has three functions: F1Quiver, F1QuverUV, F2Quiver, F2QuiverUV and F2QMask.
F1Quiver, F1QuverUV transforms image data row by row into one dimensional spatial frequency domain.
F2Quiver, F2QuverUV as the name implies converts whole of image through a 2d transform into spatial frequency domain.
F2QMask uses the given mask frame(s) and convolves with input clip.

F2Quiver runs at a little over 12 fps (compared to 7 fps of FQ2d of FQuiver) for a 720 X 480 frame size.

F1Quiver, F1QuverUV and F2Quiver, F2QuverUV functions have test facilty for frequency spectral display, and a large number of cascadable frequency domain Gaussian and Butterworth filters for signal processing. Homomorphic filtering can also be done with these two functions. YUY2 and YV12 color formats only are supported by these functions.

A quiver is a carrying case of a bunch of arrows used by hunters in olden times. As this plugin has a large number of filters, this name was chosen. I am reminded of an excellent book titled 'A quiver full of arrows ' by Jeffry Archer.

Comments, suggestions and bug reports may please be addressed to me by either mohanvc or through the excellent doom9 forum avisynth usage threads.