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Method and apparatus for detecting and reacting to occurrence of an event

  • US 7,006,666 B2
  • Filed: 11/21/2001
  • Issued: 02/28/2006
  • Est. Priority Date: 11/21/2001
  • Status: Expired due to Fees
First Claim
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1. A method of detecting occurrence of an event, the method comprising:

  • comparing a first compressed digital frame size to a later compressed digital frame size in a sequence of compressed digital image frames to determine whether a change in size exists that is greater than a predetermined amount, and, if the change in size is greater than the predetermined amount, using that determination to indicate the occurrence of the event, wherein the occurrence of the event is an appearance of a new object in the later compressed frame;

    periodically selecting a frame in the sequence of compressed frames after the occurrence of the event and transmitting each selected frame, wherein the step of periodically selecting selects at least one of every 10 adjacent frames during the occurrence of the event; and

    performing external pattern recognition on the selected frame using an external pattern.

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