Title :
Rate-distortion optimization for fast hierarchical B-picture transcoding
Author :
Shen, Huifeng ; Sun, Xiaoyan ; Wu, Feng ; Li, Shipeng
Author_Institution :
Univ. of Sci. & Technol. of China, Hefei
Abstract :
An efficient rate-distortion (R-D) optimal method for transcoding hierarchical B-pictures is proposed in this paper. A new R-D model is presented for fast transcoding hierarchical B-pictures in DCT domain, in which the total R-D optimization problem is adjusted to motion R-D optimization and texture R-D optimization separately. Accordingly, a mechanism for fast mode decision is proposed to enable the mode and motion adjustment in hierarchical B-picture DCT-domain transcoding. Experimental results show that the proposed transcoding scheme with the new R-D optimization can achieve 4-dB average PNSR improvement at low bit-rate, and similar performance at high bit-rate, compared to the transcoding by reusing the input motion information. Moreover, as the transcoding is performed in DCT domain, it is fast and simple enough for many real applications
Keywords :
discrete cosine transforms; motion estimation; rate distortion theory; transcoding; transform coding; video coding; DCT domain; R-D model; discrete cosine transforms; fast hierarchical B-picture transcoding; fast mode decision; mode adjustment; motion R-D optimization; motion adjustment; motion information; rate-distortion optimization; texture R-D optimization; Asia; Bit rate; Decoding; Discrete cosine transforms; MPEG 4 Standard; Rate-distortion; Static VAr compensators; Sun; Transcoding; Video coding;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1693824
