Patent ID: 6317152
Filing Date: 2001-11-13
Classification: G07F,H04N

Abstract:
A digital video recording system comprising:a camera directed at a scene of interest to view the scene and generate frames of video images thereof at a predetermined frame rate, each of said frames of video image comprising a plurality of pixel elements;a converter configured to convert each frame of video image produced by said camera to a digital signal;a memory configured to store digital signals;a processor configured to process said digital signal by comparing portions of said video image represented by said digital signal with corresponding portions from a previously established reference of the scene to determine if any changes have occurred therein, said processor configured to compress and store those portions of said video signal which differ from a corresponding portion of said reference in said memory; and,playback means accessing said memory to retrieve the contents of said digital signals and recreate the video images produced by said camera, said playback means accessing said memory at any desired memory location representing a time of interest so as not to have to scan the video images to locate a video image of interest, and said playback means accessing said memory without interrupting said processors processing digital signals representing currently acquired video images.