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20世纪70年代以来,以传送视觉信息为主要使命的图像通信方式有了迅速的发展。电视传播和互联网技术大大促进了以“中心对终端”图像信息传播方式的发展;可视电话和手机的图像传输技术促进了“终端对终端”图像信息传播方式的发展。每秒传输25帧彩色图像的便携式数字化扩频图像
Since the 1970s, there has been a rapid development in the way of image communication with the transmission of visual information as the main mission. Television and Internet technologies have greatly promoted the development of “center-to-terminal” image information transmission. Video transmission technology of video phones and mobile phones has promoted the development of “terminal-to-terminal” image information transmission. Portable digitized spread spectrum image that transmits 25 frames of color image per second