基于能流信息場(chǎng)景檢測(cè)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(jìn)行運(yùn)動(dòng)估計(jì)的方法，然后把該運(yùn)動(dòng)信息運(yùn)用到場(chǎng)景檢測(cè)中，最后分析了場(chǎng)景切換下MPEG-4 Q2碼率控制算法失效的原因，提出了基于場(chǎng)景切換補(bǔ)償?shù)拇a率控制策略，并在場(chǎng)景切換時(shí)對(duì)MPEG-4 Q2算法得到的目標(biāo)比特?cái)?shù)進(jìn)行修正。實(shí)驗(yàn)結(jié)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(diǎn)及后繼幀圖像編碼的質(zhì)量。
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關(guān)鍵詞:
- 運(yùn)動(dòng)估計(jì);場(chǎng)景切換檢測(cè);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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