EVC编程；使用按钮触发作为视频捕捉的触发装置搭建一个可供演示的自动视频捕捉照相系统；当按动指定按钮动作发生时，系统照相操作被触发，连续拍摄一定数量的图像并逐一显示-EVC programming; use the buttons to trigger video capture as a trigger device structures for a demonstration of the automatic camera video capture system; When pressed