tailieunhanh - Báo cáo toán học: " Memory bandwidth-scalable motion estimation for mobile video coding"

Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: Memory bandwidth-scalable motion estimation for mobile video coding | Hsieh et al. EURASIP Journal on Advances in Signal Processing 2011 2011 126 http content 2011 1 126 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access Memory bandwidth-scalable motion estimation for mobile video coding Jui-Hung Hsieh Wei-Cheng Tai and Tian-Sheuan Chang Abstract The heavy memory access of motion estimation ME execution consumes significant power and could limit ME execution when the available memory bandwidth BW is reduced because of access congestion or changes in the dynamics of the power environment of modern mobile devices. In order to adapt to the changing BW while maintaining the rate-distortion R-D performance this article proposes a novel data BW-scalable algorithm for ME with mobile multimedia chips. The available BW is modeled in a R-D sense and allocated to fit the dynamic contents. The simulation result shows 70 BW savings while keeping equivalent R-D performance compared with reference software for low-motion CIF-sized video. For high-motion sequences the result shows our algorithm can better use the available BW to save an average bit rate of up to 13 with up to PSNR increase for similar BW usage. Keywords motion estimation memory bandwidth AVC 1. Introduction With the rapid progress of semiconductor technology video coding is becoming popular in modern mobile devices to provide video services. In these devices motion-compensated temporally predictive coding with motion estimation ME not only contributes the most to the coding efficiency of modern video encoder designs 1 but also requires large amounts of computations as well as data bandwidth BW 2 . This leads to severe design challenges for power-limited mobile devices. In power-limited mobile device the available power could be changed dynamically due to low battery power or dynamic power management such as dynamic voltage and frequency scaling 2 3 . In such cases the available data BW could be .