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

Volume

1

fYear

2002

fDate

2002

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Image Processing. 2002. Proceedings. 2002 International Conference on

ISSN

1522-4880

Print_ISBN

0-7803-7622-6

Type

conf

DOI

10.1109/ICIP.2002.1038122

Filename

1038122