rewrite these options

FFT3DFilter is a highly revered, advanced 3D frequency domain video denoiser and moderate sharpener used heavily in the video restoration community. Originally developed by Alexander G. Balakhnin (aka Fizick) for AviSynth and later ported to VapourSynth, it cleans up grainy, noisy video by converting video blocks from the spatial domain into the mathematical frequency domain.

By splitting a video into overlapping tiles and analyzing them over a series of sequential frames, FFT3DFilter can aggressively isolate and target noise without destroying fine structural details, causing minimal blur or common temporal artifacts. How the Core Engine Works

Unlike basic spatial denoisers that look at neighboring pixels on a single frame, FFT3DFilter processes video globally through a multi-step mathematical pipeline:

Block Division: The filter segments every video frame into small, heavily overlapped blocks (e.g., 32×32 or 48×48 pixels) to prevent visible boundary lines.

Forward 2D FFT: A Fast Fourier Transform (FFT) converts these spatial pixel blocks into a frequency spectrum. In this domain, complex structures like edges and fine lines appear as distinct, high-energy frequencies, while random noise shows up as low-energy background fluctuations.

Temporal Processing (3D): The filter evaluates these frequencies across a window of surrounding frames (time domain). If a frequency variation exists consistently across frames, it is flagged as detail; if it is chaotic and random, it is flagged as noise.

Adaptive Filtering: It applies mathematically optimal Wiener or Kalman filters to the frequency spectrum, zeroing out or dampening noise frequencies while preserving video details.

Inverse FFT & Summation: The cleaned frequency spectrum is converted back into spatial pixels via an Inverse FFT (IFFT). The overlapping blocks are blended back together seamlessly using weighting windows. Key Technical Parameters

To master FFT3DFilter, you need to understand its primary arguments:

FFT3DFilter is 3D Frequency Domain filter – denoiser – AviSynth