Motion and intrusion detecting system
First Claim
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1. A motion detection system comprising:
- means for scanning a given field of view and for generating scan signals corresponding to the content of said field of view;
said scanning means including means for scanning said given field at a first predetermined scanning rate and for subsequently scanning said field at a second predetermined scanning rate which is different from said first scanning rate, at least one of each of said first and second predetermined scanning rate scans comprising a scanning cycle;
means responsive to said scan signals at each scanning rate 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;
first storage means for selectively storing said coded information signals corresponding to said scanning at said first scanning rate;
second storage means for selectively storing said coded information signals corresponding to said scanning at second scanning rate;
means for comparing predetermined coded information corresponding to said plurality of points from a given scan of said field at said first scanning rate with coded information corresponding to said plurality of points generated during a subsequent scan of said field at said first scanning rate on a point-by-point basis, said subsequent scan at said first scanning rate being in the same scanning cycle as said given scan at said first scanning rate or in a subsequent scanning cycle;
means for comparing predetermined coded information corresponding to said plurality of points from a given scan of said field at said second scanning rate with coded information corresponding to said plurality of points generated during a subsequent scan of said field at said second scanning rate on a point-by-point basis, said subsequent scan at said second scanning rate being in the same scanning cycle as said given scan at said second scanning rate or in a subsequent scanning cycle;
means for generating an alarm signal when a given difference is detected between said compared signals for said corresponding points at either of said scanning rates; and
means responsive to a given number of said alarm signals for generating an alarm indication.
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Abstract
A motion and intrusion detecting system wherein scanning at two different rates is carried out in order to more reliably detect fast and slow motion in a scene being viewed. Also, increased noise immunity is provided by providing a special scan which generates signals inhibiting generation of alarm indications corresponding to points at which a possible noise situation exists.
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Citations
55 Claims
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1. A motion detection system comprising:
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means for scanning a given field of view and for generating scan signals corresponding to the content of said field of view; said scanning means including means for scanning said given field at a first predetermined scanning rate and for subsequently scanning said field at a second predetermined scanning rate which is different from said first scanning rate, at least one of each of said first and second predetermined scanning rate scans comprising a scanning cycle; means responsive to said scan signals at each scanning rate 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; first storage means for selectively storing said coded information signals corresponding to said scanning at said first scanning rate; second storage means for selectively storing said coded information signals corresponding to said scanning at second scanning rate; means for comparing predetermined coded information corresponding to said plurality of points from a given scan of said field at said first scanning rate with coded information corresponding to said plurality of points generated during a subsequent scan of said field at said first scanning rate on a point-by-point basis, said subsequent scan at said first scanning rate being in the same scanning cycle as said given scan at said first scanning rate or in a subsequent scanning cycle; means for comparing predetermined coded information corresponding to said plurality of points from a given scan of said field at said second scanning rate with coded information corresponding to said plurality of points generated during a subsequent scan of said field at said second scanning rate on a point-by-point basis, said subsequent scan at said second scanning rate being in the same scanning cycle as said given scan at said second scanning rate or in a subsequent scanning cycle; means for generating an alarm signal when a given difference is detected between said compared signals for said corresponding points at either of said scanning rates; and means responsive to a given number of said alarm signals for generating an alarm indication. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 40, 41, 42, 43, 44, 45, 46, 47)
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23. A method of motion detection comprising:
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scanning a given field of view and generating scan signals corresponding to the content of said given field of view, said given field being scanned at a first predetermined scanning rate and subsequently scanned at a second predetermined scanning rate which is different from said first scanning rate, wherein at least one of each of said first and second predetermined scanning rate scans comprises a scanning cycle; 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; storing said coded information signals corresponding to said scanning at said first scanning rate; storing said coded information signals corresponding to said scanning at second scanning rate; comparing predetermined coded information corresponding to said plurality of points from a given scan of said field at said first scanning rate with coded information corresponding to said plurality of points generated during a subsequent scan of said field at said first scanning rate on a point-by-point basis, said subsequent scan at said first scanning rate being in the same scanning cycle as said given scan at said first scanning rate or in a subsequent cycle; comparing predetermined coded information corresponding to said plurality of points from a given scan of said field at said second scanning rate with coded information corresponding to said plurality of points generated during a subsequent scan of said field at said second scanning rate on a point-by-point basis, said subsequent scan at said second scanning rate being in the same scanning cycle as said given scan at said second scanning rate or in a subsequent scanning cycle; generating an alarm signal when a given difference is detected between said compared signals for said corresponding points at either of said scanning rates; and generating an alarm indication responsive to a given number of said alarm signals. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 48, 49, 50, 51, 52, 53, 54, 55)
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Specification