움직임벡터 군집화를 이용한 H.264/AVC에서 MPEG-2로의 비디오 트랜스코딩 = H.264/AVC to MPEG-2 Video Transcoding by using Motion Vector Clustering

다국어 초록 (Multilingual Abstract)

The H.264/AVC is increasingly used in broadcast video applications such as Internet Protocol television (IPTV), digital multimedia broadcasting (DMB) because of high compression performance. But the H.264/AVC coded video can be delivered to the widespread end-user equipment for MPEG-2 after transcoding between this video standards. This paper suggests a new transcoding algorithm for H.264/AVC to MPEG-2 transcoder that uses motion vector clustering in order to reduce the complexity without loss of video quality. The proposed method is exploiting the motion information gathered during h.264 decoding stage. To reduce the search space for the MPEG-2 motion estimation, the predictive motion vector is selected with a least distortion of the candidated motion vectors. These candidate motion vectors are considering the correlation of direction and distance of motion vectors of variable blocks in H.264/AVC. And then the best predictive motion vector is refined with full-search in ${\pm}2$ pixel search area. Compared with a cascaded decoder-encoder, the proposed transcoder achieves computational complexity savings up to 64% with a similar PSNR at the constant bitrate(CBR).

참고문헌 (Reference)

1 손남례, "움직임벡터의 거리와 방향성을 고려한 H.264 에러 은닉 방법" 한국통신학회 34 (34): 37-47, 2009

2 Moiron, S., "Video transcoding from H.264/AVC to MPEG-2 with reduced computational complexity" 637-650, 2009

3 S. Sharmat, "Transcoding of H.264 BITSTREAM to MPEG-2 BITSTREAM" 2007

4 TTA Standard, "Standard for Satellite Digital Multimedia Broadcasting Transmitter / Receiver Interface" 2004

5 Kunzelmann, P., "Reduced complexity H.264 to MPEG-2 transcoder" 2007

6 Moiron, S., "Mode Conversion for H.264 to MPEG-2 Video Transcoder" 2007

7 "ISO/IEC 13818-2, "Information technology - Generic coding of moving pictures and associated audio information-Part 2: Video""

8 Yang, L., "H.264/MPEG-2 transcoding based on personal video recorder platform" 438-440, 2005

9 Moiron, S, S., "H.264/AVC to MPEG-2 Video Transcoding Architecture" 449-452, 2007

10 Moiron, S., "Fast interframe transcoding from H.264/AVC to MPEG-2"