数字视频的全面认识和分层测试(上)

Comprehensive Understanding and Hierarchical Test of Digital Video (1)

为了全面认识数字视频的体系构架,本文借用了信息系统的层次模型,对高标清、压缩及无压缩的数字视频进行了层次分析。通过对应于各层次的技术指标,以及实际中常见的一些问题,阐述了对数字视频系统性能进行分层测试的观测方法和工作思路。

For a long time,the discussion on digital video mostly concentrates on such interface standard as eye diagram,jitter and so on,and it is seldom recognized that,when an analog video system evolves to a digital one,the more essential change is that the originally relatively closed video begins to merge into the digital IT field and begins to have the characteristics of digital information system such as structure,hierarchy,process,laws and so on. In order to comprehensively understand the architecture of digital video,a hierarchical analysis of HDTV/SDTV and compressed/uncompressed digital video is made using hierarchical model of information system,and an observing method and basic working ideas for hierarchical tests are expounded