专利汇可以提供Contrast detector for video tracking system专利检索,专利查询,专利分析的服务。并且The video output of a television camera which is being utilized to acquire and track a target is fed through an appropriate clamp and filter to positive and negative peak detectors, which detect the maximum and minimum values of this video appearing within an area defined by a tracking gate or ''''window.'''' The time constants of the peak detectors are adjusted in accordance with the expected area of the target to provide an optimum signal to noise ratio. Peak positive and negative excursions of the video are held in hold circuits, the time constants of these circuits being governed by an appropriate control signal which provides different time constants for the acquisition mode and for the tracking mode. The outputs of the hold circuits are subtracted from each other, the difference signal thus obtained indicating the spread between the peak positive and negative excursions of the sampled video. This difference signal is multiplied by separate predetermined factors to provide separate signals, each of which is a different fraction of the spread signal. These signals are each separately algebraically summed with the signal representing the peak positive excursion and the signal representing the peak positive excursion and fed to separate voltage comparators for comparison with the clamped and filtered camera output. The output signals thus generated, which represent the width of the video signal at the various amplitudes represented by the multiplying factors, are fed to tracking logical control for utilization in controlling the slewing of the TV camera.,下面是Contrast detector for video tracking system专利的具体信息内容。
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