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Multi-level retarder plate polarization dependent imaging

  • US 5,528,287 A
  • Filed: 07/11/1995
  • Issued: 06/18/1996
  • Est. Priority Date: 10/20/1992
  • Status: Expired due to Term
First Claim
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1. A retarder plate for a television camera comprising:

  • said camera including a plurality of pixels;

    said retarder plate being disposed before said plurality of pixels;

    a linear polarizer between said plurality of pixels and said retarder plate;

    said retarder plate including a first plurality of first regions having a first optical thickness;

    said retarder plate including a second plurality of second regions having a second optical thickness;

    said first optical thickness and said second optical thickness differing from each other by a multiple of one quarter of an optical wavelength;

    said first plurality being aligned before a first subset of said plurality of pixels; and

    said second plurality being aligned before a second subset of said plurality of pixels, whereby said linear polarizer and said first and second regions produce two of left-hand polarization, right-hand polarization, and non-polarization.

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