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从20世纪80年代开始到90年代末期在安防监控领域几乎所有存储记录设备都是模拟录像机,在实际使用中,检索图像非常不便,经常为查询某小段录像而浪费大半天的时间,并且对录像带的保存条件要
From the beginning of the 1980s to the late 1990s, almost all storage recording devices in the field of security monitoring are analog video recorders. In actual use, it is very inconvenient to retrieve images and often wasting most of the time for querying a small video. The preservation conditions to be