An abrupt scene-transition 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-transition 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, they are unsuitable for computing the QP of the scene-transition intra frame. In this paper, a modified algorithm for detecting scene transitions is presented, and a real-time rate control scheme accounting for the characteristics of intra coding is proposed for scenetransition 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 improved by an average of 18.6 %.
Bibliographical noteFunding Information:
1This work was supported by the Korea Ministry of Information and Communication under the ITRC (Information Technology Research Center) and the Communication R&D Center in Samsung Electronics Co., Ltd. Changhyun Lee and Yunje Oh are with the Communication R&D Center, Samsung Electronics Co. Ltd., Suwon, Korea (e-mail: firstname.lastname@example.org). Yunho Jung is with the Institute of TMS Information Technology, Yonsei University, Seoul, Korea (e-mail: email@example.com). Seongjoo Lee is with the Department of Information and Communication Engineering, Sejong University, Korea (e-mail: firstname.lastname@example.org). Jaeseok Kim is with the Department of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea (e-mail: email@example.com).
All Science Journal Classification (ASJC) codes
- Media Technology
- Electrical and Electronic Engineering