基于能流信息場景檢測的碼率控制策略
Rate Control Scheme Based on Scene Change Detection Using Energy Flow Information
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摘要: 該文首先介紹了用能流信息進行運動估計的方法，然后把該運動信息運用到場景檢測中，最后分析了場景切換下MPEG-4 Q2碼率控制算法失效的原因，提出了基于場景切換補償?shù)拇a率控制策略，并在場景切換時對MPEG-4 Q2算法得到的目標比特數(shù)進行修正。實驗結果表明，該方法可以在保證編碼緩沖器不發(fā)生上溢的前提下改善切換點及后繼幀圖像編碼的質(zhì)量。
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關鍵詞:
- 運動估計;場景切換檢測;碼率控制
Abstract: Firstly, a method is introduced to estimate motion vectors between two pictures with energy flow information. Secondly, these motion vectors are applied to detect the scene change. Finally, from analyzing MPEG-4 Q2 rate-control algorithm with the situation of scene changes, an improved rate-control algorithm is proposed where the scene change is taken into account. In the improved algorithm, the target bit budget from MPEG-4 Q2 is modified when scene change occurs. Experimental results show that the proposed scheme can improve the picture quality at or after scene change without buffer overflow. -
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