Adaptive MPEG Transcoding using Discontinuity Feature

Abstract

Video transcoding is one of the key technologies in implementing dynamic bit rate adaptation of a video stream to the available bandwidth over various networks. Though there have been many different transcoding schemes, since they do not concern the contents of video, the quality of transmitted video becomes worse as the rate of reduction increases. In this paper, we propose a content-based adaptive MPEG transcoding method using a discontinuity feature in the Discrete Cosine Transform (DCT) domain. In the experiment, we show the result that the video quality of content-based transcoding is better than that of a constant cut-off method and the processing time of the adaptive method is much faster compared with the pixel domain methods in the same bandwidth.

Indexing terms:

• MPEG Transcoding: Scalable coding scheme
• Dynamic bitrate adaptation
• Visual quality

Additional information

Notes on contributors

Taey Ong Kim

Tae Yong Kim received the BS degree and MS degree from Hanyang University, Korea, in 1986 and 1988, respectively. He received the PhD degree in 1998 from the Pohang University of Science and Technology, Pohang, in the field of Computer Science and Engineering. He is currently a research professor in the Graduate School of Advanced Imaging, Science, Multimedia and Film, Chung-Ang University, Republic of Korea. His research interests include computer network, computer vision and image processing.

Jong Soo Choi

Jong-Soo Choi received the BS degree from Inha University, Inchon, his MS degree from Seoul National University, Seoul, Korea, and his PhD degree from Keio University, Yokohama, Japan, all in electrical engineering, in 1975, 1977 and 1981, respectively. He joined the faculty at Chung-Ang University in 1981, where he is now a dean of the Graduate School of Advanced Imaging Science, Multimedia and Film. His current research interests are in computer vision, image coding, and electro-optical systems.