A Fast Downsizing Video Transcoder for H.264/AVC with Rate-Distortion Optimal Mode Decision

Author

Shen, Huifeng ; Sun, Xiaoyan ; Wu, Feng ; Li, Houqiang ; Li, Shipeng

Author_Institution

Univ. of Sci. & Technol. of China

fYear

2006

fDate

9-12 July 2006

Firstpage

2017

Lastpage

2020

Abstract

This paper focuses on the mode decision and motion selection problem when H.264/AVC video streams are transcoded in spatial resolution. A fast downsizing transcoding scheme is developed in which a new rate-distortion (R-D) optimal mode decision mechanism is presented for high speed transcoding as well as high coding efficiency. A model for estimating relative prediction errors is applied in this paper, which is free from computation of interpolation and SAD/SSD computation. Based on the selected model, a motion refinement within a distance of 1 pixel is performed after mode decision. Experimental results demonstrate that our method can significantly speed up the spatial resolution reduction process, while achieving high coding efficiency

Keywords

code standards; error analysis; image motion analysis; image resolution; interpolation; prediction theory; rate distortion theory; transcoding; video coding; video streaming; H.264-AVC video stream; SAD-SSD computation; interpolation; mode decision; motion refinement; motion selection problem; prediction error estimation; rate-distortion mechanism; spatial resolution; transcoding; Asia; Automatic voltage control; Discrete cosine transforms; Displays; Interpolation; Motion estimation; Rate-distortion; Spatial resolution; Transcoding; Video coding;

fLanguage

English

Publisher

ieee

Conference_Titel

Multimedia and Expo, 2006 IEEE International Conference on

Conference_Location

Toronto, Ont.

Print_ISBN

1-4244-0366-7

Electronic_ISBN

1-4244-0367-7

Type

conf

DOI

10.1109/ICME.2006.262609

Filename

4037025