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Frame-Layer H.264 Rate Control for Scene-Change Video at Low Bit Rate  

Lee, Chang-Hyun (Department of Electrical and Electronic Engineering Yonsei University)
Jung, Yun-Ho (Department of Electrical and Electronic Engineering Yonsei University)
Kim, Jae-Seok (Department of Electrical and Electronic Engineering Yonsei University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.44, no.11, 2007 , pp. 127-136 More about this Journal
Abstract
An abrupt scene-change frame is one that is hardly correlated with the previous frames. In that case, because an intra-coded frame has less distortion than an inter-coded one, almost all macroblocks are encoded in intra mode. This breaks up the rate control flow and increases the number of bits used. Since the reference software for H.264 takes no special action for a scene-change frame, several studies have been conducted to solve the problem using the quadratic R-D model. However, since this model is more suitable for inter frames, the existing schemes are unsuitable for computing the QP of the scene-change intra frame. In this paper, an improved rate control scheme accounting for the characteristics of intra coding is proposed for scene-change frames. The proposed scheme was validated using 16 test sequences. The results showed that the proposed scheme performed better than the existing H.264 rate control schemes. The PSNR was improved by an average of 0.4-0.6 dB and a maximum of 1.1-1.6 dB. The PSNR fluctuation was also in proved by an average of 18.6 %.
Keywords
Abrupt scene transition; H.264; Intra coding; Rate control;
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