%0 Journal Article %T A Novel Rate Control Scheme for Low Bit Rate Stream of H.264
一种新的面向H.264低比特流的码率控制方法 %A HE Jian-xin %A CAO Yue-hui %A
贺建新 %A 曹岳辉 %J 中国图象图形学报 %D 2009 %I %X There are two limitations in JVT-G012 scheme: firstly, the linear MAD prediction model performs poorly due to high motion or scene changes. Secondly, there exist much more complex motion compensation strategies in H.264, and a higher percentage of bits is required to encode non-texture data. Thus the method that simply predicts non-texture bits through the previous coded frames is no longer efficient. First of all, a macroblock-based histogram of difference is introduced, and bits are allocated rationally among coding units according to image complexities. Furthermore, a novel rate control scheme named Spatio-Temporal MAD prediction model is presented, and a more flexible non-texture prediction scheme is derived. As shown in experiments, the proposed algorithm achieves a bit rate closer to the target, and provides an improved visual quality and the higher PSNR. %K H %K 264/AVC
码率控制 %K 差图像直方图 %K 时空域MAD预测模型 %U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=D06194629680C940ACE75262F54B9D85&aid=CDC261A903E00738BB9808BE2150CC0C&yid=DE12191FBD62783C&vid=F3583C8E78166B9E&iid=B31275AF3241DB2D&sid=2625CEFACC964DE3&eid=D60A23E3DA48A028&journal_id=1006-8961&journal_name=中国图象图形学报&referenced_num=0&reference_num=10