FIR basado en FFT

FFT-based FIR

Status:

Mantenido

Keyframes:

No

Source library:

avfilter

Source filter:

fftfilt

Available:

On Master only:

No

Known bugs:

No

Descripción

This effect/filter applies arbitrary expressions to samples in frequency domain. It is a Finite Impulse Response (FIR)[1] filter using Fast Fourier Transform (FFT)[2].

Parámetros

Parámetro	Valor	Descripción
Ganancia plano Y/U/V	Entero	Set the gain value for the Y (luma), U (1st chroma) or V (2nd chroma) plane. Allowed values are 0 to 250, default is 0.
Luminancia plano Y/U/V	Decimal	Set the frequency domain weight value for the Y (luma), U (1st chroma) or V (2nd chroma) plane. Allowed values are 0.000 to 5.000, default is 1.000.
Evaluación	Selección	Set when the expressions are evaluated.

The following selection items are available:

Evaluación

Inicial	Only evaluate expressions once during filter initialization (default)
Fotograma	Evaluate expressions for each incoming frame

Advertencia

If Evaluate is set to frame render times will be significantly longer as each frame is evaluated individually.

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[1]

For more information about FIR see this article: What is an FIR filter?

[2]

This is a good introduction to Fourier Transforms in image processing.