蓝幕技术是通过在同一色彩的背景上拍摄物体，通过背景色彩特殊的色调信息加以区分前景和背景，从而达到自动去除背景保留前景的目的。-Blue screen technology is by shooting the same color of the background object, to distinguish between foreground and background information by the special tone color of the background to