In some key control systems,for example the air traffic control system,there must be a computer screen snapshots recording system,working 7 plus 24 hours,nonstop,with picture quality lossless and low storage cost.

• 在空中交通管制等关键系统中要求7×24 h不停机对系统计算机屏幕进行无损记录,同时记录的存储代价不能过大。