DMB视频的方块效应分析与改善算法设计  

DMB video blocking effect analysis and the reduction algorithm design

作　　者：张红升[1] 徐贺[1] 王国裕[1] 朱仁义[1] 潘超[1] 

机构地区：[1]重庆邮电大学微电子工程重点实验室,重庆400065

出　　处：《电视技术》2017年第4期126-129,共4页Video Engineering

基　　金：国家自然科学基金项目(61401051);重庆市科委基础与前沿研究计划项目(cstc2013jcyj A40006)

摘　　要：针对数字多媒体广播(Digital Multimedia Broadcasting,DMB)在传输较高分辨率视频时方块效应明显的问题,分析了方块效应的产生机理,并通过优化DCT系数和调整量化过程,使得视频主观质量得到显著改善。在512 kbit/s的DMB广播信道中,实现了640×480分辨率视频的流畅传输,是DMB标准视频分辨率的4倍。Blocking effect is one of the main factors to limit Digital Multimedia Broadcast （DMB） to transfer higher resolution vide- os. To improve the video quality, the mechanism of the blocking effect is studied, and an optimized quantization method by adjus- ting the DCT coefficients is proposed. Test results show that the proposed method reduces the blocking effect and improve the subjective video quality efficiently, and enables a 512 kbit/s DMB channel to transfer satisfactory video with resolution as high as 640 × 480, which is 4 times as defined in the DMB standard.

关 键 词：数字多媒体广播 方块效应 视频编码 视频质量 

分 类 号：TN919.8[电子电信—通信与信息系统]