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Video denoising is the process of removing noise from a video signal. Video denoising methods can be divided into: * Spatial video denoising methods, where image noise reduction is applied to each frame individually. * 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.〔http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.80.4529〕 Video denoising methods are designed and tuned for specific types of noise. Typical video noise types are following: * Analog noise * * Radio channel artifacts * * * High frequency interference (dots, short horizontal color lines, etc.) * * * Brightness and color channel interference (problems with antenna) * * * Video reduplication – false contouring appearance * * VHS artifacts * * * Color-specific degradation * * * Brightness and color channel interference (specific type for VHS) * * * Chaotic line shift at the end of frame (lines resync signal misalignment) * * * Wide horizontal noise strips (old VHS or obstruction of magnetic heads) * * Film artifacts (''see also Film preservation'') * * * Dust, dirt, spray * * * Scratches * * * Curling (emulsion exfoliation) * * * Fingerprints * Digital noise * * Blocking – low bitrate artifacts * * Ringing – low and medium bitrates artifact especially on animated cartoons * * Blocks (slices) damage in case of losses in digital transmission channel or disk injury (scratches on DVD) Different suppression methods are used to remove all these artifacts from video. == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Video denoising」の詳細全文を読む スポンサード リンク
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