Adaptive rate control mechanism in H.264/AVC for scene changes

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題名:	Adaptive rate control mechanism in H.264/AVC for scene changes
作者:	張寶基;FANG, Jiunn-Tsair;CHAN, Chen-Cheng;CHEN, Zong-Yi;CHANG, Pao-Chi
貢獻者:	資訊電機學院通訊工程學系
關鍵詞:	Adaptive control systems;Computer programs;Computer simulation;Deterioration;Frames;H.264/AVC;Mathematical models;Quadratic programming;rate control;scene change;Software;target bits;target buffer level
日期:	2014-12-01
上傳時間:	2026-04-23 12:54:55 (UTC+8)
出版者:	Maruzen Co., Ltd/Maruzen Kabushikikaisha;The Institute of Electronics, Information and Communication Engineers
摘要:	摘要： Rate control that is required to regulate the bitrate of video coding is critical to time-sensitive video applications used over networks. However, the H.264/AVC standard does not respond to scene changes, and this causes the transmission quality to deteriorate as a scene change occurs. In this work, a scene change is detected by comparing the ratio of the sum of absolute difference (SAD) between two consecutive frames. As the scene change is detected, the proposed method, which is modified from the reference software of H.264/AVC, re-assigns a quantization parameter (QP) value to regulate the bitrate. Because the inter-prediction works poorly for the scene-changed frame, the proposed method estimates its frame complexity based on the content, and further creates another Q-R model to assign QP. The adaptive rate control mechanism presented in this study can quickly respond to the heavy bitrate increment caused by a change of scene. Simulation results show that the proposed method improves the average peak signal noise ratio (PSNR) to approximately 1.1dB, with a smaller buffer size compared with the performance of the reference software JM version 17.2. 其他題名： IEICE Trans. Fundamentals 出版者： The Institute of Electronics, Information and Communication Engineers 出版日期： 2014-01-01 出處： IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 2014, Vol.E97.A(12), pp.2625-2632 資源來源： J-STAGE Free 版權： 2014 The Institute of Electronics, Information and Communication Engineers 識別號： ISSN: 1745-1337 識別號： ISSN: 0916-8508 識別號： EISSN: 1745-1337 識別號： DOI: 10.1587/transfun.E97.A.2625
顯示於類別:	[通訊工程學系] 期刊論文

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