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Proceedings Paper

Adaptive down-sampling video coding
Author(s): Ren-Jie Wang; Ming-Chen Chien; Pao-Chi Chang
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Paper Abstract

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.

Paper Details

Date Published: 27 January 2010
PDF: 8 pages
Proc. SPIE 7542, Multimedia on Mobile Devices 2010, 75420P (27 January 2010); doi: 10.1117/12.840257
Show Author Affiliations
Ren-Jie Wang, National Central Univ. (Taiwan)
Ming-Chen Chien, National Central Univ. (Taiwan)
Chin Min Institute of Technology (Taiwan)
Pao-Chi Chang, National Central Univ. (Taiwan)

Published in SPIE Proceedings Vol. 7542:
Multimedia on Mobile Devices 2010
Reiner Creutzburg; David Akopian, Editor(s)

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