Adaptive down-sampling video coding

Ren Jie Wang, Ming Chen Chien, Pao Chi Chang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

11 Scopus citations


Down-sampling coding, which sub-samples the image and encodes the smaller sized images, is one of the solutions to raise the image quality at insufficiently high rates. In this work, we propose an Adaptive Down-Sampling (ADS) coding for H.264/AVC. The overall system distortion can be analyzed as the sum of the down-sampling distortion and the coding distortion. The down-sampling distortion is mainly the loss of the high frequency components that is highly dependent of the spatial difference. The coding distortion can be derived from the classical Rate-Distortion theory. For a given rate and a video sequence, the optimum down-sampling resolution-ratio can be derived by utilizing the optimum theory toward minimizing the system distortion based on the models of the two distortions. This optimal resolution-ratio is used in both down-sampling and up-sampling processes in ADS coding scheme. As a result, the rate-distortion performance of ADS coding is always higher than the fixed ratio coding or H.264/AVC by 2 to 4 dB at low to medium rates.

Original languageEnglish
Title of host publicationProceedings of SPIE-IS and T Electronic Imaging - Multimedia on Mobile Devices 2010
StatePublished - 2010
EventMultimedia on Mobile Devices 2010 - San Jose, CA, United States
Duration: 18 Jan 201019 Jan 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceMultimedia on Mobile Devices 2010
Country/TerritoryUnited States
CitySan Jose, CA


  • Down-sampling
  • H.264
  • High-definition video
  • Video coding


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