Nam Jae Yeal, Kang Byung Ho, Son Yoo Ek

The Transactions of the Korea Information Processing Society (1994 ~ 2000), Vol. 6, No. 2, pp. 534-542, Feb. 1999
10.3745/KIPSTE.1999.6.2.534,   PDF Download:

Abstract

A well-designed rate control strategy can improve overall quality for video transmission over a constant hit rate channel and the rate control method is not a normative part of the MPEG-video standard, the performance of MPEG video codec can be quite different depends on how to implement the rate control scheme. The rate control scheme proposed in MPEG shows good results when scene changes is not occurred. But it has weakness that it does not properly handle scene-changed pictures. Therefore picture quality after scene change is deteriorated, and possibility of overflow occurrence becomes high. In this paper, a new method for detection of scene change occurrence using local variance and a new determination scheme for adaptive quantization parameter, mqunt, which can consider local characteristics of an image by using previously computed the local variance from the scene change detection part are proposed. In addition, an adaptive rate control scheme which can handles scene changed picture very efficiently by saving encoding bits from some pictures before the scene change occurrence and allocating the saved bits to the scene-changed picture is proposed. Computer simulations are performed to verify the performance of the proposed algorithms. The suggested detection algorithm precisely detected scene change. And the proposed rate control scheme shows better rate control performance as compared with that of the conventional MPEG scheme.

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