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| Rate Control Scheme Based on Scene Change Detection
Using Energy Flow Information |
| Zhang Zhong-wei; Liu Gui-zhong; Li Hong-liang; Li Yong-li |
| Shool of Electronic & Information, Xi’an Jiaotong University, Xi’an 710049, China |
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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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Received: 17 May 2004
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2005, Vol. 27 
