Video post-processing

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See also: Post-production

The term post-processing (or postproc for short) is used in the video/film business for quality-improvement 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.

[edit] Post-processing routines

• Image scaling:
  • linear interpolation
  • bilinear interpolation
  • cubic interpolation
  • bicubic interpolation
  • trilinear interpolation
• SSP (Statistical-Post-Processing)
• Deblocking
• Deringing
• Sharpen / Unsharpen (often referred to as "soften")
• Requantization
• Luminance alterations
• Blurring / Denoising
• Deinterlacing
• Deflicking
  • weave deinterlace method
  • bob deinterlace method
• 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

[edit] External links

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

v • d • e Video processing Post-processing Deblocking · Resizing · Deinterlacing · Denoising · Deflicking Special processing Film colorization (tinting) · Color grading · Filmizing · Super-resolution 24 to 30 fps conversion Telecine (3:2 pulldown) 30 to 24 fps conversion Inverse telecine