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Differential electronic imaging system

  • US 5,168,528 A
  • Filed: 08/20/1990
  • Issued: 12/01/1992
  • Est. Priority Date: 08/20/1990
  • Status: Expired due to Term
First Claim
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1. A differential electronic imaging system comprising:

  • an array formed with a plurality of photosensors arranged in a matrix, each of which receives input light for a respective pixel in an image plane of an input image and outputs an analog sensor signal in correspondence therewith;

    a plurality of sensor signal processing circuits, each of which is connected to a respective one of said plurality of photosensors and includes a conversion element for converting the analog sensor signal from the respective photosensor into corresponding differential image data, and output means for outputting said differential image data;

    a means for generating clock signals for controlling said sensor signal processing circuits to provide differential image data representing an object image alone, anddisplay processing means for receiving the differential image data from the respective sensor signal processing circuits in order to generate a display corresponding to the input image, said means for generating clock signals for controlling said sensor signal processing circuits in successive frame periods, each frame period including a first partial period for processing an object-plus-FBP image and a second partial period for processing a fixed background pattern (FBP) image, in order to process differential image data representing the object image alone.

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