Title :
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
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;
Conference_Titel :
MPEG-4. 2001 Proceedings of Workshop and Exhibition on
Conference_Location :
San Jose, CA
Print_ISBN :
0-7803-7165-8
DOI :
10.1109/MPEG.2001.996455
