Image retention and information security system

  • US 5,751,346 A
  • Filed: 01/08/1997
  • Issued: 05/12/1998
  • Est. Priority Date: 02/10/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of operation for a video security system, comprising the steps of:

  • selectively connecting an output from each of a plurality of video security cameras to an image digitizer,digitizing first and second time spaced images from a one of said video cameras when said one camera is connected to said image digitizer,comparing said first and second images to measure the extent of change from said first image to said second image,comparing said extent of change to a reference value to determine if said extent of change is greater than said reference value,continuing said step of selectively connecting when said extent of change is not greater than said reference value,storing at least said second image in a digital storage only when said extent of change is greater than said reference value, wherein said second images can be read from said digital storage,accumulating a group of said second images which are stored concurrently in said digital storage, andretrieving for examination from said digital storage at least one of said second images in said group of said second images stored in said digital storage.

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