Motion vector re-estimation for fast video transcoding from MPEG-2 to MPEG-4

Author

Nakajima, Junichi ; Tsuji, Hiroyuki ; Yashima, Y. ; Kobayashi, Naoki

Author_Institution

Cyber Space Labs., NTT, Tokyo, Japan

fYear

2001

fDate

2001

Firstpage

87

Lastpage

90

Abstract

This paper addresses the topic of heterogeneous video transcoding from MPEG-2 to MPEG-4. A new motion vector resampling/refinement method is proposed based on a variability measure, with which fast transcoding is achieved with no deterioration of video quality. The effectiveness of the new method was verified in a computational experiment. The experimental results obtained show that the total SAD (sum of absolute difference) calculation involved in the motion vector refinement is reduced by about 90% when a full-search algorithm is adopted. Moreover, even when the fast algorithm HAVS (horizontal and vertical search) is adopted for the motion vector search, the SAD calculation is reduced by 10-15%

Keywords

code convertors; image sampling; motion estimation; search problems; video coding; MPEG-2; MPEG-4; fast video transcoding; full-search algorithm; heterogeneous transcoding; horizontal and vertical search algorithm; motion vector re-estimation; motion vector refinement; motion vector resampling; sum of absolute difference calculation; variability measure; IP networks; Laboratories; MPEG 4 Standard; Motion estimation; Motion measurement; Narrowband; Spatial resolution; Streaming media; Transcoding; Visual communication;

fLanguage

English

Publisher

ieee

Conference_Titel

MPEG-4. 2001 Proceedings of Workshop and Exhibition on

Conference_Location

San Jose, CA

Print_ISBN

0-7803-7165-8

Type

conf

DOI

10.1109/MPEG.2001.996455

Filename

996455