DocumentCode :
1389295
Title :
Adaptive Quantization-Parameter Clip Scheme for Smooth Quality in H.264/AVC
Author :
Hu, Sudeng ; Wang, Hanli ; Kwong, Sam
Author_Institution :
Dept. of Comput. Sci., City Univ. of Hong Kong, Kowloon, China
Volume :
21
Issue :
4
fYear :
2012
fDate :
4/1/2012 12:00:00 AM
Firstpage :
1911
Lastpage :
1919
Abstract :
In this paper, we investigate the issues over the smooth quality and the smooth bit rate during rate control (RC) in H.264/AVC. An adaptive quantization-parameter (Qp) clip scheme is proposed to optimize the quality smoothness while keeping the bit-rate fluctuation at an acceptable level. First, the frame complexity variation is studied by defining a complexity ratio between two nearby frames. Second, the range of the generated bits is analyzed to prevent the encoder buffer from overflow and underflow. Third, based on the safe range of the generated bits, an optimal Qp clip range is developed to reduce the quality fluctuation. Experimental results demonstrate that the proposed Qp clip scheme can achieve excellent performance in quality smoothness and buffer regulation.
Keywords :
data compression; quantisation (signal); video coding; H.264/AVC; adaptive quantization-parameter clip scheme; encoder buffer; frame complexity variation; quality fluctuation; rate control; smooth bit rate; smooth quality; Bit rate; Complexity theory; Encoding; Prediction algorithms; Quantization; Streaming media; Video sequences; Encoder buffer; H.264/AVC; quantization-parameter clip; rate control (RC); smooth quality; Algorithms; Data Compression; Image Enhancement; Image Interpretation, Computer-Assisted; Photography; Reproducibility of Results; Sensitivity and Specificity; Signal Processing, Computer-Assisted; Video Recording;
fLanguage :
English
Journal_Title :
Image Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1057-7149
Type :
jour
DOI :
10.1109/TIP.2011.2176347
Filename :
6095366
Link To Document :
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