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Optical image processing method and system to perform unsharp masking on images detected by an I.I./TV system

  • US 4,918,534 A
  • Filed: 04/22/1988
  • Issued: 04/17/1990
  • Est. Priority Date: 04/22/1988
  • Status: Expired due to Term
First Claim
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1. An optical image processing method in a radiographic system in which an image of an object is produced by an image intensifier and converted to video signals by means of a television (TV) camera system, comprising:

  • placing a liquid crystal display (LCD) between said image intensifier and said T.V. camera system at a location shifted from a focal plane of said TV camera system, said LCD defining plural pixels which are controllable so that light from said image produced by said image intensifier and impinging on said plural LCD pixels can be selectively attenuated by application of selected control signals to said LCD; and

    generating said control signals selectively based on predetermined parameters of said radiographic system and said image; and

    applying said selectively generated control signals to said LCD to perform selective attenuation and corresponding dynamic range compression of light passing through respective ones of said plural LCD pixels, thereby to perform unsharp masking of said image produced by said image intensifier using said LCD.

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