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Efficient pre-alarm buffer management in intelligent video information management system

  • US 5,996,023 A
  • Filed: 04/29/1998
  • Issued: 11/30/1999
  • Est. Priority Date: 10/31/1996
  • Status: Expired due to Term
First Claim
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1. A video data storage apparatus, comprising:

  • a plurality of video cameras, each generating a respective stream of video signals;

    conversion means, connected to said plurality of video cameras, for selectively converting said streams of video signals into respective streams of video data signals;

    circular buffer means for selectively storing ones of said streams of video data signals subject to overwriting by more current video data signals;

    main storage means for selectively storing ones of said streams of video data signals and for writing the video data signals stored in said main storage means to a removable archive recording medium;

    detection means for detecting an alarm condition; and

    control means for selecting between a first process and a second process different from said first process, on the basis of the alarm condition detected by said detection means;

    said first and second processes both being processes for transferring a stream of video data signals from said circular buffer means to said main storage means.

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