FIR basato su FFT

FFT-based FIR

Stato:

Mantenuto

Fotogrammi chiave:

No

Libreria sorgente:

avfilter

Filtro sorgente:

fftfilt

Disponibile:

Solo nel Principale:

No

Bug conosciuti:

No

Description

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].

Parametri

Parametro	Valore	Description
Gain in Y / U / V plane	Intero	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.
Luminance Y / U / V plane	Virgola mobile	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.
Vàluta	Selezione	Set when the expressions are evaluated.

Sono disponibili le seguenti voci di selezione:

Vàluta

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

Avvertimento

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.