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Video signal processing systems

  • US 4,774,583 A
  • Filed: 02/06/1985
  • Issued: 09/27/1988
  • Est. Priority Date: 03/07/1984
  • Status: Expired due to Term
First Claim
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1. A video signal processing system for combining a plurality of images comprising:

  • a plurality of sources each of which provides video signals representing a respective image and priority signals for the respective image;

    a series of selector stages connected to each other and to the sources such that each selector stage in the series;

    (i) receives as its inputs said video signals and priority signals from a respective one of said sources and video signals and priority signals from a preceding selector stage, if any, in the series, and(ii) selects from among said inputs selected video signals and priority signals on the basis of the priority signals received as said inputs, and provides as its outputs the selected video signals and priority signals, and transmits said outputs to a next selector stage, if any, in the series; and

    means for combining the selected video signals provided as said outputs by the last selector stage in the series to produce output video signals, and wherein each said selector stage comprises means for selecting from among said inputs and for providing as its first and second outputs, the video signals which have the highest and the second highest priority signals but not video signals which have lower priority signals.

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