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Real time video conferencing system and method with multilayer keying of multiple video images

  • US 5,657,096 A
  • Filed: 05/03/1995
  • Issued: 08/12/1997
  • Est. Priority Date: 05/03/1995
  • Status: Expired due to Term
First Claim
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1. A method of combining at least two video signal streams into a combined video signal stream, each of the video signal streams corresponding to a respective image, the method comprising the steps of:

  • successively receiving a first video signal stream which corresponds to a first image, said first video signal stream comprising data segments which correspond to a picture element of said first image, each data segment having a video signal portion and a priority signal portion;

    successively receiving a second video signal stream which corresponds to a second image, said second video signal stream comprising data segments which correspond to a picture element of said second image, each data segment having a video signal portion and a priority signal portion;

    receiving control signals corresponding to at least one user selected parameter;

    adjusting said priority signal portion of the data segments of said second video signal stream on the basis of said control signals;

    providing an adjusted priority signal portion for each segment of said second video signal stream; and

    selectively outputting either a data segment of said first video signal stream or a data segment of said second video stream on the basis of a comparison between the priority signal portion of each segment of the first video signal stream and each adjusted priority signal portion of each segment of said second video stream, said combined output video signal stream corresponding to a combined image having features dependent on said at least one user selected parameter.

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