Title :
Fast software MPEG-2 video transcoder with optimization of requantization error compensation
Author :
Tajime, Junji ; Senda, Yuzo ; Miyamoto, Yoshihiro
Author_Institution :
Multimedia Res. Labs., NEC Corp., Kawasaki, Japan
Abstract :
A low-complexity software video transcoder with motion compensation (MC) of requantization errors has been developed. For reducing the processing time of the developed transcoder, two novel methods are proposed. One is a sparse block transcoding method that bypasses a transcoding process according to the distribution of the transform coefficients in an input block. This method is valid for about half of all blocks of P pictures. The other is a fast MC method that alternates rounding directions of MC per picture to decrease conditional judgments. The processing time of the fast MC is reduced to three fifths. The transcoder with the proposed methods has been running in real-time on PCs.
Keywords :
coding errors; data compression; discrete cosine transforms; motion compensation; optimisation; quantisation (signal); transform coding; video coding; DCT; IDCT algorithm; P pictures; PC; discrete cosine transform; fast software MPEG-2 video transcoder; low-complexity software video transcoder; motion compensation; optimization; personal computers; processing time reduction; requantization error compensation; rounding control; sparse block transcoding; transform coefficients distribution; Bandwidth; Bit rate; Decoding; Digital TV; Discrete cosine transforms; Error compensation; Personal communication networks; Quantization; Transcoding; Video on demand;
Conference_Titel :
Image Processing. 2002. Proceedings. 2002 International Conference on
Print_ISBN :
0-7803-7622-6
DOI :
10.1109/ICIP.2002.1038122
