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    • 11. 发明授权
    • Optical system and method for image sampling in a video projection system
    • 视频投影系统中图像采样的光学系统和方法
    • US4827334A
    • 1989-05-02
    • US120557
    • 1987-11-13
    • Richard H. JohnsonMartin A. KyktaSteven M. Jarrett
    • Richard H. JohnsonMartin A. KyktaSteven M. Jarrett
    • H04N9/31H04N5/74
    • H04N9/31
    • An optical system and method for image sampling in a video projection system is provided. A beam of illumination light is passed through a first beam-splitting polarizer to provide a first beam of a first polarization state and a second beam of a second polarization state. The first beam is passed through a second beam-splitting polarizer which is oriented at 90.degree. with respect to the first prism. The light from the second prism is then provided to a modulation device which produces a polarization modulated image in reflected outgoing light. The reflected outgoing light is passed through the second prism such that a first portion is directed to an image display screen and a second portion, which contains an image sample, is directed toward the first prism. The image sample is reflected by the first prism and provided to an image detector which detects characteristics of the sample. The detected characeristics are utilized to control the outgoing light.
    • 提供了一种用于视频投影系统中的图像采样的光学系统和方法。 照射光束通过第一分束偏振器以提供第一偏振状态的第一光束和第二偏振状态的第二光束。 第一光束通过相对于第一棱镜定向成90°的第二光束分离偏振器。 然后将来自第二棱镜的光提供给在反射出射光中产生偏振调制图像的调制装置。 反射的出射光通过第二棱镜,使得第一部分被引导到图像显示屏幕,并且包含图像样本的第二部分指向第一棱镜。 图像样本被第一棱镜反射并提供给检测样本特征的图像检测器。 检测到的特征用于控制出射光。