Universal motion and intrusion detection system

• US 4,081,830 A
• Filed: 06/17/1976
• Issued: 03/28/1978
• Est. Priority Date: 09/30/1974
• Status: Expired due to Term

• Current Assignee: Video TEK Incorporated
• Original Assignee: Video TEK Incorporated
• Inventors: Beck, Donald, Mick, Peter
• Primary Examiner(s): Britton, Howard W.
• Application Number:
  US05/697,110
• Time in Patent Office: 649 Days
• Field of Search: 358/105, 358/108, 358/210, 178/68
• US Class Current: 348/155
• CPC Class Codes: G06V 20/52 Surveillance or monitoring of activities, e.g. for recognising suspicious objects recognising microscopic objects G06V20/69
• CPC Class Codes: G08B 13/19602 Image analysis to detect motion of the intruder, e.g. by frame subtraction
• CPC Class Codes: G08B 13/19634 Electrical details of the system, e.g. component blocks for carrying out specific functions
• CPC Class Codes: G08B 13/19671 Addition of non-video data, i.e. metadata, to video stream
• CPC Class Codes: G08B 13/1968 Interfaces for setting up or customising the system
• CPC Class Codes: G08B 13/19689 Remote control of cameras, e.g. remote orientation or image zooming control for a PTZ camera

Abstract

A motion and intrusion detection system utilizing video techniques samples fixed points during a video scan of the field of view of a camera and stores information concerning the fixed scanned points. During subsequent scans, information concerning the respective scanned points is compared with previous scans and threshold conditions are set up in order to detect an alarm condition. Further, apparatus is provided to change the field of view of the video system and in order to automatically focus and zoom in to magnify a particular portion of the field of view. Still further, means is provided to display a "map" of the alarmed areas on the screen of the television monitor.

Claims

1. A motion and intrusion detection system comprising:

means for scanning a given field and for generating scan signals corresponding to the content of said field;

means responsive to said signals for converting said scan signals into a plurality of coded digital signals which correspond to a predetermined characteristic of said field content at a plurality of points in said field;

storage means for selectively storing said coded information corresponding to said plurality of points;

means for comparing predetermined coded information corresponding to said plurality of points from a first scan of said field with the coded information corresponding to said plurality of points generated during a subsequent scan of said field on a point-by-point basis;

means for generating an alarm signal when a given difference is detected between said compared signals for corresponding points; and

means responsive to said alarm signals for generating an alarm indication.

2. Apparatus according to claim 1 wherein said storage means includes means for selectively re-circulating the information corresponding to a complete scan of said field at selected periods of time.

3. Apparatus according to claim 1 wherein said alarm signal generating means for generating gating signals only at times corresponding to the timing of predetermined points of a given scan of said field;

and alarm gating means responsive to said gating signals for gating selected alarm signals to said alarm indication means.

4. Apparatus according to claim 3 wherein said scanning means produces a plurality of successive scans of said field, and wherein said means for generating gating signals, comprises:

means for selecting predetermined scans of said plurality of scans and for generating a field-select signal during the time that said predetermined scans are present;

means for selecting predetermined scanning lines within a scan and generating a line-select signal during the presence of said predetermined scanning lines;

means for selecting predetermined scanning points on said scanning lines and for generating a point-select signal when said predetermined points are present; and

means responsive at least to said field-select, line-select and point-select signals for generating said gating signals.

5. Apparatus according to claim 4 wherein said alarm gating means comprises means responsive to said alarm signals and to said gating signals for generating gated alarm signals.

6. Apparatus according to claim 1 wherein said alarm indication means includes means for generating an alarm indication after receipt of a predetermined number of said alarm signals.

7. Apparatus according to claim 1 wherein said alarm signal generating means includes means for selecting at least one rectangular portion of said field such that alarm signals are coupled to said alarm indication generating means only for alarm signals generated within said selected rectangular portion.

8. Apparatus according to claim 7 wherein said alarm signal generating means includes alarm gating means responsive to said means for selecting said portion of said field for gating said alarm signals to said alarm indication means.

9. Apparatus according to claim 8 wherein said means for selecting at least one portion of said field comprises first means for generating a signal of predetermined time duration and having a predetermined delay relative to the beginning of a scan of said field:

second means for generating a signal having a predetermined duration and having a predetermined time delay relative to the beginning of scanning of each line of said field; and

coincidence means for gating the outputs from said first and second means to said alarm gating means.

10. Apparatus according to claim 9 wherein said first means comprises a pair of serially connected one-shot multivibrators having adjustable time delays and said second means comprises a pair of serially connected one-shot multivibrators having adjustable time delays.

11. Apparatus according to claim 10 comprising means for generating horizontal sync signals and vertical sync signals, said first means being responsive to said vertical sync signals and said second means being responsive to said horizontal sync signals.

12. Apparatus according to claim 4 comprising means for generating synchronized vertical sync signals, horizontal sync signals and sample point clock signals, and wherein said means for selecting predetermined scans of said plurality of scans includes a counter responsive to said vertical sync signals and adjustable decoding means responsive to the output of said counter.

13. Apparatus according to claim 12 wherein said means for selecting predetermined scanning lines comprises a counter responsive to said horizontal sync signals and adjustable decoding means coupled to said counter.

14. Apparatus according to claim 13 wherein said means for selecting predetermined scanning points comprises a counter responsive to said sample point clock signal and adjustable decoding means coupled to the output of said counter.

15. Apparatus according to claim 1 wherein said converting means comprises an analog-to-digital converter for converting said scan signal into a digital signal;

means coupled to the output of said converting means for detecting maximum and minimum values of the output of said converting means; and

means for adjusting the high and low conversion level of said analog-to-digital converter.

16. Apparatus according to claim 1 comprising means for displaying said signals from said scanning means on a video monitor;

and means responsive to the output of said alarm signal generating means for modulating the video signal displayed on said monitor so as to impart a predetermined characteristic to the display on said monitor at portions where alarm signals are generated.

17. Apparatus according to claim 16 wherein said modulator modulates said portions where an alarm signal is generated so as to darken the display at said portions.

18. Apparatus according to claim 1 comprising means for displaying said signals from said scanning means on a monitor;

and means for modulating the points on said displayed signals at which alarm detection is to be carried out.

19. Apparatus according to claim 1 comprising means for selecting at least one random area of said field;

said means for generating an alarm signal being responsive to the output of said random area selecting means for generating said alarm signal only during scanning of said selected random areas.

20. Apparatus according to claim 19 comprising means for displaying said scan signals on a monitor, and wherein said random area selecting means comprises a light pen adapted to be located adjacent said display on said monitor for generating a signal corresponding to the position said light pen is placed adjacent said display.

21. Apparatus according to claim 20 comprising a register means responsive to the outputs of said light pen for storing an indication of the position of said light pen on said display and means for generating signals corresponding to the position of said light pen on said display such that said alarm signals are coupled to said alarm indication means only when they occur during said at least one selecting area.

22. Apparatus according to claim 21 comprising a buffer register coupled to said register means for storing one line of information, and means responsive to the output of said register means and to the output of said buffer register for coupling the output of at least one of said register and buffer register to said means for generating said alarm signal.

23. Apparatus according to claim 1 comprising a control means coupled to said scanning means and responsive to said alarm signals which are coupled to said alarm indication means for controlling the position of said scanning means as a function of said alarm signals.

24. Apparatus according to claim 23 wherein said video camera comprises a zoom lens and wherein said camera control means comprises means for varying the focal length of sad zoom lens responsive to said alarm signals coupled to said alarm indication means.

25. Apparatus according to claim 1 comprising means coupled to said alarm indication means for transmitting alarm information to remote points.

26. Apparatus according to claim 1 comprising means for displaying said scan signals on a monitor;

and a digital-to-analog converter coupled to the output of said storage means for generating analog signals corresponding to the contents of said storage means, said analog signals being coupled to said display means for displaying a digital-type representation of the field scanned by said scanning means.

27. Method of detecting motion and intrusion, comprising:

scanning a field and generting scan signals corresponding to the content of said field;

converting said scan signals into a plurality of coded digital signals which correspond to a predetermined characteristic of said field content at a plurality of points in said field;

selectively storing said coded information corresponding to said pluraity of points;

comparing predetermined coded information corresponding to said plurality of points from a first scan of said field with the coded information corresponding to said plurality of points generated during a subsequent scan of said field on a point-by-point basis;

generating an alarm signal when a given difference is detected between said compared signals for corresponding points; and

generating an alarm indication responsive to said alarm signals.

28. Method according to claim 27 wherein said storing step includes selectively re-circulating the information corresponding to a complete scan of said field at selected periods of time.

29. Method according to claim 27 wherein said step of generating an alarm signal includes generating gating signals only at times corresponding to the timing of predetermined points of a given scan of said field;

and gating selected alarm signals to an alarm indication means responsive to said gating signals.

30. Method according to claim 29 comprising producing a plurality of successive scans of said field, and wherein said step of generating gating signals, comprises:

selecting predetermined scans of said plurality of scans and generating a field-select signal during the time that said predetermined scans are present;

selecting predetermined scanning lines within a scan and generating a line-select signal during the presence of said predetermined scanning lines;

selecting predetermined scanning points on said scanning lines and for generating a point-select signal when said predetermined points are present; and

generating said gating signals responsive at least to said field-select, line-select and point-select signals.

31. Method according to claim 30 comprising generating gated alarm signals responsive to said alarm signals and to said gating signals.

32. Method according to claim 27 comprising generating said alarm indication only responsive to a predetermined number of said alarm signals.

33. Method according to claim 27 wherein said step of generating an alarm signal includes selecting at least one rectangular portion of said field and indicating an alarm indication only for alarm signals generated within said selected rectangular portion.

34. Method according to claim 33 wherein said step of selecting at least one portion of said field comprises generating a signal of predetermined time duration and having a predetermined delay relative to the beginning of a scan of said field;

generating a signal having a predetermined duration and having a predetermined time delay relative to the beginning of scanning of each line of said field; and

gating the outputs from said first and second means to an alarm gating means.

35. Method according to claim 30 comprising generating synchronized vertical sync signals, horizontal sync signals and sample point clock signals, and wherein said step of selecting predetermined scans of said plurality of scans includes counting said vertical sync signals and decoding the resulting count.

36. Method according to claim 35 wherein said step of selecting predetermined scanning lines comprises counting said horizontal sync signals and decoding the resulting count of said horizontal sync signals.

37. Apparatus according to claim 36 wherein said step of selecting predetermined scanning points comprises counting said sample point clock signals and decoding the resulting count of said sample point clock signals.

38. Method according to claim 27 wherein said converting step comprises detecting maximum and minimum values of said coded digital signals;

and adjusting the high and low conversion level of said conversion responsive to said detection of said maximum and minimum values.

39. Method according to claim 27 comprising displaying the scan signals on a video monitor;

and modulating the video signal displayed on said monitor responsive to an alarm signal so as to impart a predetermined characteristic to the display on said monitor at portions where alarm signals are generated.

40. Method according to claim 39 wherein said modulator modulates said portions where an alarm signal is generated so as to darken the display at said portions.

41. Method according to claim 27 comprising displaying said scan signals on a monitor;

and modulating the points on said displayed scan signal at which alarm detection is to be carried out.

42. Method according to claim 27 comprising selecting at least one random area of said field;

and generating an alarm signal responsive to the output of said random area selection for generating said alarm signal only during scanning of said selected random areas.

43. Method according to claim 42 comprising displaying said scan signals on a monitor, and wherein said step of selecting at least one random area comprises locating a light pen adjacent said display on said monitor for generating a signal corresponding to the position at which said light pen is placed adjacent said display.

44. Method according to claim 43 comprising storing an indication of the position of said light pen on said display, and generating signals corresponding to the positions of said light pen on said display such that said alarm signals are coupled to an alarm indication means only when they occur during said at least one selected area.

45. Method according to claim 27 comprising controlling the area of said scanning of said field responsive to said alarm signals.

46. Method according to claim 27 comprising displaying said scan signals on a monitor;

and generating analog signals corresponding to said stored digital signals, said analog signals being coupled to said monitor for displaying a digita-type representation of said field.

47. Method according to claim 27 comprising scanning a field of view with a video camera and generating video scan signals.

48. Method according to claim 47 wherein said video camera comprises a zoom lens and comprising controlling the position of said camera and the focal length of said zoom lens responsive to said alarm signals.