FFTQuiver

Abstract
Author	V.C.Mohan
Version	19 Mar 2017
Download	FQPlus.7z
Category	External filters
License	GPLv2
Discussion

Description

Regular frequency interference on images. These can be attenuated with either 1D or 2D frequency filters. Frequency spectral displays enable to find such interference and design correcting filters. Full Description

Requirements

• AviSynth+ r2347 or greater
• libfftw3f-3.dll, FFTw3.dll, or fftw.dll

Syntax and Parameters

F1Quiver (clip, int "Array of values", bool "morph", bool "rescale", float "gamma", int "frad", bool "uv")

clip   =

Input clip.

int  Array of values = #,#,#,#

Sets of integers. For "custom" pairs of frequency and percentage amplitude must follow. Each standard filter has a set of 4 values

bool  custom = false

Is filter of custom design?

bool  morph = false

Whether homomorphic filtering is to be done?

bool  uv = false

Whether Planar U and V planes also to be filtered.

F2Quiver (clip, int "Array of values", bool "morph", bool "rescale", int "frad", bool "uv")

clip   =

Input clip.

bool  Array of values = #,#,#,...

Sets of integers. For F2Quiver at least one set must be specified.

bool  morph = false

Is this a homomorphic process?

bool  rescale = false

Is rescaling the output required?

float  gamma = 0.05

Gamma value to be used for spectral display scaling.

int  gamma = 32

Filter radial length.

boolean  uv = false

Are u and v planes of YUV444 to be filtered?

Examples

F1Quiver

F1Quiver(25,100,34,0,42,0, 54,100, custom = true)

F1Quiver(5,39,200,1, uv = true)

F2Quiver

F2Quiver(5,5,60,-35,20,1,2,120,60,8,4,1,70,80,4,3,4,40,42,18,morph=false,gamma=0.04)

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