Rate-Distortion Optimized Bitstream Extractor for Motion Scalability in Wavelet-Based Scalable Video Coding

13 years 9 months ago

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—Motion scalability is designed to improve the coding efﬁciency of a scalable video coding framework, especially in the medium to low range of decoding bit rates and spatial resolutions. In order to fully beneﬁt from the superiority of motion scalability, a rate-distortion optimized bitstream extractor, which determines the optimal motion quality layer for any speciﬁc decoding scenario, is required. In this paper, the determination process ﬁrst starts off with a brute force searching algorithm. Although guaranteed by the optimal performance within the search domain, it suffers from high computational complexities. Two properties, i.e., the monotonically nondecreasing property and the unimodal property, are then derived to accurately describe the rate-distortion behavior of motion scalability. Based on these two properties, modiﬁed searching algorithms are proposed to reduce the complexity (up to ﬁve times faster) and to achieve the global optimality, even for those decodi...

Meng-Ping Kao, T. Q. Nguyen

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