FFT-based FIR

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].

The effect does not have keyframes.

FFT-based FIR effect

• Gain in Y / U / V plane - 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 - 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.

• Evaluate - Set when the expressions are evaluated. Options are init (only evaluate expressions once during filter initialization) and frame (evaluate expressions for each incoming frame), default is init.

Warning

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

Notes

[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.