Video postprocessing

See also: Post-production

The term post-processing (or postproc for short) is used in the video/film business for quality-improvement image processing (specifically digital image processing) methods used in video playback devices, (such as stand-alone DVD-Video players), and video players software and transcoding software.

Video post-processing is the process of changing the perceived quality of a video on playback (done after the decoding process). Image scaling routines such as linear interpolation, bilinear interpolation, or cubic interpolation) can for example be performed when increasing the size of images, this involves either subsampling (reducing or shrinking an image) or zooming (enlarging an image). This helps reduce or hide image artifacts and flaws in the original film material. It is important to understand that post-processing always involves a trade-off between speed, smoothness and sharpness.

Post-processing routines

• Image scaling and multivariate interpolation:
  • Nearest-neighbor interpolation
  • linear interpolation
  • bilinear interpolation
  • cubic interpolation
  • bicubic interpolation
  • Bézier surface
  • Lanczos resampling
  • trilinear interpolation
  • Tricubic interpolation
• SSP (Statistical-Post-Processing)
• Deblocking
• Deringing
• Sharpen / Unsharpen (often referred to as "soften")
• Requantization
• Luminance alterations
• Blurring / Denoising
• Deinterlacing
  • weave deinterlace method
  • bob deinterlace method
• Deflicking
• 2:3 pull-down / ivtc (inverse telecine) for conversion from 24 frames-per-seconds to 30 frames-per-seconds
• 3:2 pull-up (telecine conversion) for conversion from 30 frames-per-seconds to 24 frames-per-seconds

External links

• Videotranscoding Wiki -(documentation on server-side usage of MPlayer for transcoding)

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