videotex可视图文videon.录像；视频v.录制电视节目adj.视频的；录像的Video Camera Technology摄像技术video attenuator switch视频信号衰减器开关video frequency carrier视频载波Video To Noise Ratio dB视频信噪比video text segmentation视频文字分割videotex service center可视图文业务中心videoinfonnation center可视化中心video object extraction视频对象提取video display interface视频显示接口video signal mean level图像信号平均电平