| DMB视频的方块效应分析与改善算法设计 |
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| 引用本文： | 张红升,徐贺,王国裕,朱仁义,潘超.DMB视频的方块效应分析与改善算法设计[J].电视技术,2017,41(4). |
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| 作者姓名： | 张红升 徐贺 王国裕 朱仁义 潘超 |
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| 作者单位： | 重庆邮电大学微电子工程重点实验室,重庆,400065 |
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| 基金项目： | 国家自然科学基金(61401051); 重庆市科委基础与前沿研究计划项目(cstc2013jcyjA40006) |
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| 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.
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| 关 键 词： | 数字多媒体广播 方块效应 视频编码 视频质量 |
| 收稿时间： | 2017/2/11 0:00:00 |
| 修稿时间： | 2017/4/17 0:00:00 |
DMB video blocking effect analysis and the reduction algorithm design |
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| ZHANG Hongsheng,XU He,WANG Guoyu,ZHU Renyi and PAN Chao.DMB video blocking effect analysis and the reduction algorithm design[J].Tv Engineering,2017,41(4). |
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| Authors: | ZHANG Hongsheng XU He WANG Guoyu ZHU Renyi and PAN Chao |
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| Affiliation: | Chongqing University of Posts and Telecommunications,Chongqing University of Posts and Telecommunications,Chongqing University of Posts and Telecommunications,Chongqing University of Posts and Telecommunications,Chongqing University of Posts and Telecommunications |
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| Abstract: | Blocking effect is one of the main factors to limit Digital Multimedia Broadcast (DMB) to transfer higher resolution videos. To improve the video quality, the mechanism of the blocking effect is studied, and an optimized quantization method by adjusting 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 kbps DMB channel to transfer satisfactory video with resolution as high as 640×480, which is 4 times as defined in the DMB standard. |
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| Keywords: | DMB Blocking effect Video coding Video quality |
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