摘要
针对视频无线传输,提出一种基于3D-DCT能量感知的动态自适应流媒体混数模DASH-HDA视频传输方案。取代参考方案DASH-HDA中的2D-DCT,利用3D-DCT对视频帧的模拟部分进一步去除时间相关性;根据3D-DCT系数的能量大小,对模拟信号进行重要性排序打包,并将系数包重组为优先级不同的DASH层。实验结果表明,与参考方案相比,在较低的信道码率条件下,由于可以传输能量较大的数据包,所提方案提升了视频的重构质量;当可用的信道码率逐渐升高时,由于采用了混合模拟数字编码方式,所提方案可以降低视频质量的“阶梯效应”。
This paper proposes a DASH-HDA transmission system based on 3D-DCT energy awareness.The 3D-DCT transform is carried out on the whole simulation part of the video frame,replacing the 2D-DCT transform in DASH-HDA frame by frame.The DCT coefficients of the simulated data are packaged and the importance of coefficient packets is sorted.The position information of coefficient packets is transmitted by metadata,and then the coefficient packets are reorganized into DASH layers with different priorities.At low channel rate,compared with the traditional scheme,when the channel rate is the same,it can transmit more energy packets and improve the quality of video reconstruction.When the transmission channel bit rate increases gradually,the ladder effect can be reduced.Experimental results show that the proposed scheme is better than the comparison scheme.
作者
黄森
霍旭
王安红
HUANG Sen;HUO Xu;WANG Anhong(School of Electronic Information Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《电视技术》
2021年第5期21-26,共6页
Video Engineering
基金
国家自然科学基金(No.62072325)
山西省科技重大专项(No.20191102010)
山西省关键核心技术和共性技术研发攻关专项(No.20201102011)
山西省高等学校科技成果转化培育项目(No.20191042)
山西省科技成果转化引导专项项目(No.201804D131035)。
