Scene-adaptive bit rate control strategy

摘要

Abstract: An effective bit rate control scheme is one of the most important issues in the video coding algorithm for the transmission of high quality images through the band limited channel. An MPEG2 three step rate control algorithm is well suited for high compression of normal pictures maintaining good quality. But it is well known that the MPEG2 rate control algorithm can not handle scene change efficiently. In this paper, we present a simple rate control algorithm which is capable of handling scene changed pictures efficiently. The algorithm assigns more bits to scene changed pictures and fewer bits to previous pictures maintaining the total bit rate. We also propose a method that can estimate the complexity of a picture using the activity of the picture. The estimated complexity is usefully used as a rate control parameter in coding of scene changed picture. Simulation results show that proposed algorithm enhance the visual qualities after scene change.!7