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    • 2. 发明授权
    • Geometrical transformations in optics
    • 光学中的几何变换
    • US4138190A
    • 1979-02-06
    • US727304
    • 1976-09-24
    • Olof Bryngdahl
    • Olof Bryngdahl
    • G06K9/74G02B27/42G03H1/08G06E3/00G02B5/32G02B27/38
    • G02B27/46G02B27/42G02B27/4205G03H1/08G06E3/001Y10S359/90
    • Geometrical image modifications such as coordinate transformations and local translation, inversion, reflection, stretching which require space-variant optical coherent systems are provided by introducing phase filters having a predetermined phase function into optical coherent systems in such a manner that the local phase variations influence light from local object areas. In one embodiment, the object distribution is multiplied by the phase function so that its spectrum at the frequency plane constitutes the desired transformation. In a second embodiment, the aforementioned concept is applied to produce a transformation in an image plane. The phase filters, in a preferred embodiment, comprise computer generated holograms.
    • 通过将具有预定相位函数的相位滤波器以这样的方式引入相位滤波器来提供几何图像修改,例如坐标变换和局部平移,反转,反射,拉伸,这些方法使得局部相位变化影响光 从本地对象区域。 在一个实施例中,对象分布乘以相位函数,使得其在频率平面处的频谱构成期望的变换。 在第二实施例中,上述概念被应用于在图像平面中产生变换。 在优选实施例中,相位滤波器包括计算机生成的全息图。