无线视频的内容活动性分析

视频经无线传输后的质量特点易受各方面因素的影响,对其影响规律的研究有助于选择合适的信源处理及信道传输方法.因此,针对视频的内容活动性,探讨其对无线传输质量的影响规律.首先从空域和时域两个角度总结了视频内容活动性的定义、概念及量化检测方法;对不同内容活动性的素材(QCIF格式为主)进行信源编码及信道传输仿真,得到不同压缩码率、不同信道误码条件下的劣化视频;并利用视频质量客观评测方法(仿生方法及峰值信噪比方法)得到量化的视频质量分析,并据此总结影响规律.实验结果表明:内容活动性较高的视频素材在经过无线传输后的质量劣化较大.上述结论不受信源编码及信道传输条件的变化,具有一定的普适性.在无线视频编码及传输应用中,具有一定的应用价值.

Analysis About Content Activity of Wireless Video

Quality of video would be affected by various aspects over the wireless channel.The research about this topic would be helpful to select the suitable method for codec and transmission.The paper focused on the activity of video to find its influence to the wireless video quality.Firstly,activity of video was defined and its detection method was also introduced.Secondly,simulation about the wireless video had been done to produce various types of distortion videoes .By using the method to evaluate the quality of experience,it could draw an conclusion that the higher activity the video was,the greater distortion it would received during the wireless transmission.The conclusion would be suitable for different condition whose codec or transmission method was different.And it would be helpful for wireless video codec and transmission application.