Constant Bit-Rate Multi-Stage Rate Control for Rate-Distortion Optimized H.264/AVC Encoders
スポンサーリンク
概要
- 論文の詳細を見る
H.264/AVC encoder employs rate control to adaptively adjust quantization parameter (QP) to enable coded video to be transmitted over a constant bit-rate (CBR) channel. In this topic, bit allocation is crucial since it is directly related with actual bit generation and the coding quality. Meanwhile, the rate-distortion-optimization (RDO) based mode-decision technique also affects performance a lot for the strong relation among mode, bits, and quality. This paper presents a multi-stage rate control scheme for R-D optimized H.264/AVC encoders under CBR video transmission. To enhance the precision of the complexity estimation and bit allocation, a frequency-domain parameter named mean-absolute-transform-difference (MATD) is adopted to represent frame and macroblock (MB) residual complexity. Second, the MATD ratio is utilized to enhance the accuracy of frame layer bit prediction. Then, by considering the bit usage status of whole sequence, a measurement combining forward and backward bit analysis is proposed to adjust the Lagrange multiplier λMODE on frame layer to optimize the mode decision for all MBs within the current frame. On the next stage, bits are allocated on MB layer by proposed remaining complexity analysis. Computed QP is further adjusted according to predicted MB texture bits. Simulation results show the PSNR improvement is up to 1.13dB by using our algorithm, and the stress of output buffer control is also largely released compared with the recommended rate control in H.264/AVC reference software JM13.2.
論文 | ランダム
- 「交際費等」の問題点--若干の判例を素材にして
- 弁護士報酬と経費 (弁護士報酬をめぐって)
- 遺産分割を巡る相続税法上と所得税法上の諸問題
- 離婚と税 (民事紛争と税) -- (紛争処理に際して注意さるべき税)
- 1.譲渡所得に対する課税の趣旨と所得税法33条1項にいう「資産の譲渡」の意義 2.離婚に伴う財産分与としての不動産の譲渡と譲渡所得税の課税の適否(最判昭和50.5.27)