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目前,在视频图像监控领域,数字化、网络化、智能化已成为一种发展趋势,数字视频图像监控系统也逐步进入大规模商业应用阶段。和传统的第一代模拟视频监控系统相比,数字视频图像监控系统至今已经历了两个发展阶段:20世纪90年代末期,利用计算机多媒体技术来实现视频图像的数字化监控,称为第二代准数字化本地视频监控系统,典型的产品就是数字硬盘录像机(DVR);21
At present, in the field of video image monitoring, digitization, networking and intelligence have become a trend of development. The digital video image monitoring system has also gradually entered the stage of large-scale commercial application. Compared with the traditional first-generation analog video surveillance system, digital video surveillance system has gone through two stages of development so far: in the late 1990s, the use of computer multimedia technology to achieve digital video image monitoring, known as the second generation Quasi-digital local video surveillance system, the typical product is a digital video recorder (DVR); 21