%0 Journal Article
%T An Improved Algorithm for Reduced Spatial Resolution Video Transcoding<br>改进的降低空间分辨率视频编码转换算法
%A Li Xiao-hui
%A <br>李晓辉
%J 电子与信息学报
%D 2007
%I 
%X An algorithm of improved reduced spatial resolution video transcoding is proposed in this paper. An adaptive intra-refresh scheme is presented based on the relation between drift error and motion activity of inter-coded blocks. The thresholds are dynamically adjusted according to the difference between the target bit rate and actual bit rate. This method can reduce the bit rate of intra coded frames while still maintating error robustness and limiting temporal propagation of errors. Besides, a linear rate control strategy is also present. In order to reduce computational complexity, the rate-distortion function can be mapped into a linear function. The simulation results show that the buffer fullness tend to be stabilized and the PSNR of the reconstructed image is raised.
%K Video transcoding
%K Spatial resolution
%K Adaptive intra-refresh
%K Rate control<br>视频编码转换
%K 空间分辨率
%K 自适应帧内刷新
%K 速率控制
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=64ECD8AF8BBCE326&yid=A732AF04DDA03BB3&vid=771469D9D58C34FF&iid=5D311CA918CA9A03&sid=8A34D0A419DFA293&eid=25BD9D96DA3633C5&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=0&reference_num=7