tailieunhanh - Báo cáo hóa học: " Research Article Content-Aware Video Adaptation under Low-Bitrate Constraint"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Content-Aware Video Adaptation under Low-Bitrate Constraint | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 17179 17 pages doi 2007 17179 Research Article Content-Aware Video Adaptation under Low-Bitrate Constraint Ming-Ho Hsiao Yi-Wen Chen Hua-Tsung Chen Kuan-Hung Chou and Suh-Yin Lee College of Computer Science National Chiao Tung University 1001 Ta-Hsueh Road Hsinchu 300 Taiwan Received 1 September 2006 Revised 25 February 2007 Accepted 14 May 2007 Recommended by Yap-Peng Tan With the development of wireless network and the improvement of mobile device capability video streaming is more and more widespread in such an environment. Under the condition of limited resource and inherent constraints appropriate video adaptations have become one of the most important and challenging issues in wireless multimedia applications. In this paper we propose a novel content-aware video adaptation in order to effectively utilize resource and improve visual perceptual quality. First the attention model is derived from analyzing the characteristics of brightness location motion vector and energy features in compressed domain to reduce computation complexity. Then through the integration of attention model capability of client device and correlational statistic model attractive regions of video scenes are derived. The information object- IOB- weighted rate distortion model is used for adjusting the bit allocation. Finally the video adaptation scheme dynamically adjusts video bitstream in frame level and object level. Experimental results validate that the proposed scheme achieves better visual quality effectively and efficiently. Copyright 2007 Ming-Ho Hsiao et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION With the development of wireless network and the improvement of mobile device capability .