Temporal video denoising methods, where noise between frames is reduced. Motion compensation may be used to avoid ghosting artifacts when blending together pixels from several frames.
Spatial-temporal video denoising methods use a combination of spatial and temporal denoising. This is often referred to as 3D denoising.
Overview
Video denoising is done in two areas: they are chroma and luminance; chroma noise is where one sees color fluctuations, and luminance is where one sees light/dark fluctuations. Generally, the luminance noise looks more like film grain, while chroma noise looks more unnatural or digital-like.
Video denoising methods are designed and tuned for specific types of noise. Typical video noise types are the following: