×

System and method for automatically detecting a variation of video information

  • US 5,253,070 A
  • Filed: 12/23/1991
  • Issued: 10/12/1993
  • Est. Priority Date: 12/31/1990
  • Status: Expired due to Term
First Claim
Patent Images

1. A system for automatically detecting a variation of video information in a video signal, comprising:

  • a monitoring camera for picking up an image in a place to be monitored and outputting a video signal;

    video information variation detecting means for converting the video signal outputted from said monitoring camera into digital video data, storing the digital video data by one frame and comparing the current inputted video data with the stored video data to detect a portion wherein said current and stored video data are different from each other, as the variation of video information;

    system control means including a key input unit for inputting a plurality of key signals for a monitoring operation and a microcomputer for scanning the key signals from said key input unit and controlling the system operation in accordance with the scanned result;

    video output control means for setting a window area on a monitor and, if said video information variation detecting means detects the variation of video information on the set window area, outputting an alarm control signal and generating a variation indicating marker signal corresponding to the portion in the set window area where the variation was detected, such that the marker signal is overlap-displayed on the current picture on the monitor corresponding to the variation-detected portion in the window area;

    alarm output means for giving an alarm in accordance with the alarm control signal from said video output control means; and

    the monitor displaying a variation-detected video signal under control of said video output control means;

    wherein said video output control means includes;

    a window RAM for storing a screen window address in accordance with window setting data from said microcomputer in said system control means;

    an AND gate for combining the window address data from said window RAM with output data from said video information variation detecting means to output the alarm control signal;

    a marker controller for outputting the variation indicating marker signal corresponding to the variation detected portion on the screen in response to an output signal from said AND gate and under control of said microcomputer in said system control means;

    a video imposer for imposing the variation indicating marker signal from said marker controller on the video signal from said monitoring camera; and

    a switch for selecting the video signal from said monitoring camera or an output signal from said video imposer and outputting the selected signal to said monitor under automatic monitoring function control of said microcomputer in said system control means.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×