Park Dae Chul, Choi Mi Ran, Jung Doo Young

The Transactions of the Korea Information Processing Society (1994 ~ 2000), Vol. 5, No. 2, pp. 428-436, Feb. 1998
10.3745/KIPSTE.1998.5.2.428,   PDF Download:

Abstract

Buffered rate-distortion control method of MPEG 2 compressed video channel is considered for DBS applications. A joint rate-distortion control algorithm of multichannel sources is proposed to control overall picture quality by putting some constraints on encoder's quantization parameters and buffer occupancy state to allow a limited variable bitrate (VBR) coding within a GOP block. A major drawback for video transmission over a conventional fixed rate channel without using VBR encoder is that received picture quality varies greatly, resulting in non-uniform subjective visual impairments. In order to minimize these effects buffered-constrained rate-distortion control within a GOP block level finds an optimal solution in a combined rate-distortion sense by permitting a VBR encoding over larger image sequences rather than local intra-frame based rate control with the aid of the direct feedback of the buffer state into the cost measure when multichannel programs are statistically multiplexed. Results indicate some quality gains and resources saving over the conventional constant bit rate method.

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