分级编码 meaning in English
hierarchical coding
Examples
- It imposes some bad impact on video implement over network and imposes many challenges to the traditional nonscalable video coding technology which is not efficient for transmission video over the error - prone . then the scalable video coding technology was proposed , which can provide a rang of bitrate change and its redundant video content compensate the transmission error , but loss coding efficiency
传统的不可分级编码技术已经不能满足视频在这类网络上的传输需要，就提出了可分级编码技术，它能提供一定的位率可变范围，同时因可分级性而带来的冗余信息也在一定程度上补偿了因传输误差而引起的视频内容的损失，但也因此而损失了编码效率。 - In this paper , a gray video md - 3d - spiht algorithm is proposed , which extends the md - spiht algorithm into 3d - spiht . this method is to divide the 3 - d wavelet coefficients into some number p of different groups according to their spatial and temporal relationships , and then to encode each group independently using 3d - spiht algorithm , so that p independent embedded 3d - spiht substreams are created . multiple descriptions are created
2 、将md - spiht方法推广应用于视频序列,提出了灰度视频md - 3d - spiht算法,该算法先对一组视频图象进行多级离散三维小波变换,在小波域建立空间方向树,及对空间方向树分组,再分别对各组进行3d - spiht编码,即产生多个描述,且每一描述的码流是完全嵌入式的,易于实现质量可分级编码。 - Aiming at head - and - shoulder video sequences often showed in those fields such as visual telephone , video conference and etc . , with human visual characterstic to best advantage , a scalable video coding method based on human face detection and tracing is presented in this paper . the reconstructed image sequences with good subjective quality can be obtained with very - low bitrate
本文在充分考虑人眼视觉特性的基础上，针对可视电话、视频电视会议等领域经常出现的视频头肩序列图像，提出了一种面向人脸检测与跟踪的视频分级编码方法，在极低比特率的情况下，接收端仍能获得视觉质量较好的恢复序列图像 - ( 2 ) interframe prediction model researching on the existing video scalable coding structure and the predict - tion model shows that the information between frames of video sequence was not utilized fully to improve coding efficiency in these coding scheme , especially the prediction of b frame in the enhancement layer
（ 2 ）帧间预测方式通过对这些主流可分级编码方法的预测方式进行分析与研究表明这些方法并未能很好地利用视频序列的帧间信息来进行帧间预测以提高视频编码效率,特别是对增强层b类帧的预测。 - Make a conclusion and comparison between the error control technology of streaming media ' s network transmission and that of mpeg - 4 . also make a conclusion and comparison for the congestion control technology of mpeg - 4 . considering the practical use of vod system and the characteristics of fgs , it proposes a whole qos scheme based on the mpeg - 4 vod system
总结和比较了网络流媒体传输的差错处理技术和拥塞控制技术，以及mpeg - 4的差错处理技术，结合视频点播系统的实际应用和精细分级视频编码的特点，提出了一个完整的基于mpeg - 4精细分级视频编码的视频点播系统的qos机制，能够对精细分级编码的基本层和增强层数据提供较为完善的保护措施，并能有效地利用网络带宽和避免拥塞发生。