Accurate bit-rate and quality control for the MPEG video coder

被引:0
作者
Bilato, S
Calvagno, G
Mian, GA
Rinaldo, R
机构
来源
INTERNATIONAL CONFERENCE ON IMAGE PROCESSING - PROCEEDINGS, VOL III | 1997年
关键词
D O I
暂无
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
The complexity of the MPEG video coding standard makes it a challenging task to provide simple strategies to tune the coder parameters in order to produce consistent quality images for a given bit budget. Pre-quantization and pre-coding of individual frames have been proposed in the literature as a viable solution to the problem. In this paper, we show that a simple statistical model for the DCT coefficients can be used to select quantization parameters at the macroblock level. In particular, 8 x 8 blocks of DCT coefficients are modelled as i.i.d. random vectors of independent variables. The rate-distortion performance associated to a given quantizer can be calculated from the model and the quantizer parameters can be locally controlled to meet the specified rate-distortion target. The experimental results show that, with a limited complexity, it is possible to achieve a great precision in the bit rate control without actual pre-coding.
引用
收藏
页码:571 / 574
页数:4
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