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1. 发明授权

US3890462A Speed and direction indicator for video systems 失效
标题翻译：视频系统的速度和方向指示器
公开(公告)号：US3890462A
公开(公告)日：1975-06-17
申请号：US46158674
申请日：1974-04-17
申请人： BELL TELEPHONE LABOR INC
发明人： LIMB JOHN ORMOND , MURPHY JOHN ARTHUR
IPC分类号： G01S3/786 , G01S11/12 , H04N7/26 , H04N7/36 , H04N7/02
CPC分类号： G01S11/12 , G01S3/7864 , H04N19/503 , H04N19/51 , H04N19/523
摘要： Apparatus is disclosed for measuring the speed and direction of subject movement between two video frames using only the video signal. Two selected differential signals are derived from the video signal. One of the differential signals is compared to a threshold to determine the presence of movement and the signs of the differential signals are compared to each other to find the direction of movement. Sums of each differential signal, in an area designated as moving, are accumulated over each video frame in accordance with the sign comparison between the two differential signals. At the end of each video frame, the sums are evaluated to ascertain the speed and to verify the direction of lateral movement. An embodiment of the invention uses this technique to measure only lateral subject movement. In another particularly advantageous embodiment, the same basic technique is extended to measure both horizontal and vertical movement. Individual signals indicative of horizontal and vertical movement are then combined to provide a resultant vectorial signal indicative of the complete subject movement that occurred.
摘要翻译：公开了用于仅使用视频信号来测量两个视频帧之间的被摄体移动的速度和方向的装置。从视频信号导出两个选择的差分信号。将差分信号中的一个与阈值进行比较以确定移动的存在，并且将差分信号的符号彼此进行比较以找到移动的方向。根据两个差分信号之间的符号比较，在每个视频帧上累积在指定为移动的区域中的每个差分信号的和。在每个视频帧结束时，评估总和以确定速度并验证横向运动的方向。本发明的一个实施例使用这种技术来仅测量横向对象运动。在另一个特别有利的实施例中，扩展了相同的基本技术以测量水平和垂直运动。然后组合指示水平和垂直移动的各个信号以提供指示发生的完整的被摄体移动的合成矢量信号。

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