A Novel Rate Control Method for H.264/AVC Based on Frame Complexity and Importance - Advanced Concepts for Intelligent Vision Systems - page 76

rates for an encoder are generated by coding the test sequences with the fixed QP of
32. Other condition is the same as the front experiments.
Fig. 3. illustrates that the proposed method can avoid drastic visual quality
variation caused by scenes. Smaller PSNR fluctuation implies more stable visual
quality which is highly desired in video coding.
5 Conclusion
In this paper we have presented a new rate control technique to improve the rate con-
trol in H.264/AVC video coding. The proposed method considers scene's characteris-
tics and its bit allocation is more reasonable so that it can maintain a video stream
with a smoother PSNR variation which is highly desirable in real-time video coding
and transmission. Meanwhile, experimental results show that the coding efficiency
has been improved in the proposed method.
In future work, the proposed improvements will be extended to rate control in ste-
reo video communication. Bitrate budget is first allocated to each stereo image frame
adaptively updated according to bandwidth and buffer status, combined with com-
plexity and importance of stereo image frame. Then it should also allocate bits inter
views according to a parameter of frame complexity and importance to keep the qual-
ity of each view totally equal. And it may be helpful to get a more consistent visual
quality when scene switching occurs in stereo video.
Acknowledgement
This work was supported by Natural Science Foundation of China (60872094,
60832003), the projects of Chinese Ministry of Education (200816460003), the Scien-
tific Research Fund of Zhejiang Provincial Education Department (Z200909361), and
the National 863 Project of China (2009AA01Z327).
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