Motion detection system
First Claim
1. An apparatus for detecting motion within video images comprising:
- (a) statistical means for deriving a first plurality of statistical values including a first value representative of a first portion of a video image, and a second value representative of a second portion of the video image, said second portion of the video image at least partially overlapping said first portion;
(b) storage means for storing a second plurality of statistical values derived from a previous video image;
(c) comparison means for comparing spatially corresponding statistical values of said first and second pluralities of statistical values and for signaling a difference determined between any of the spatially corresponding statistical values; and
(d) motion indicating means responsive to the difference signal for indicating the detection of motion.
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Accused Products
Abstract
A system for detecting motion in a video image is provided wherein the video image is processed into a statistical array in which the array elements are derived from overlapping portions of the image. The elements of the statistical array are compared with corresponding array elements derived from an earlier image. The overlapping nature of the statistical array elements allows any detected changes in the image to be correlated with a portion of the image that is smaller than the area from which the statistical quantities are derived. Such spatial correlation of detected image changes is accomplished by thresholding and/or Boolean comparisons among the elements of the statistical array. A motion detection system in accordance with this invention can be used with a video multiplexing system so that motion can be detected at a plurality of remote locations.
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Citations
21 Claims
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1. An apparatus for detecting motion within video images comprising:
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(a) statistical means for deriving a first plurality of statistical values including a first value representative of a first portion of a video image, and a second value representative of a second portion of the video image, said second portion of the video image at least partially overlapping said first portion; (b) storage means for storing a second plurality of statistical values derived from a previous video image; (c) comparison means for comparing spatially corresponding statistical values of said first and second pluralities of statistical values and for signaling a difference determined between any of the spatially corresponding statistical values; and (d) motion indicating means responsive to the difference signal for indicating the detection of motion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for detecting motion within video images, the apparatus comprising:
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(a) sampling means for sampling scan lines of a video image and for producing sample values representative of segments of each of said scan lines; (b) initiating means for initiating said sampling means to produce a first plurality of sample values representative of a first plurality of the scan line segments; (c) delay means for selectively delaying said initiating means and causing said sampling means to produce a second plurality of sample values representative of a second plurality of the scan line segments, said second plurality of scan line segments being displaced relative to said first plurality of segments by an amount less than the length of one of said segments; (d) storage means for storing said first and second plurality of sample values; (e) comparison means for comparing said first and second plurality of sample values with spatially corresponding first and second pluralities of stored sample values derived from a previous video image; and (f) motion indicating means responsive to said comparison means for indicating the detection of motion. - View Dependent Claims (10, 11, 12)
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13. An apparatus for detecting motion at any one of a plurality of remote locations, comprising:
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(a) a plurality of video cameras each producing a video signal corresponding to an image of one of said locations, said video signal comprising scan lines of said image and synchronization signals indicating the origin of each scan line; (b) selecting means for selecting one of said video signals; (c) synchronization means for isolating said synchronization signals of said selected video signal; (d) accumulating means for accumulating a first plurality of statistical values pertaining to a first scan line of said video image and a second plurality of statistical values pertaining to a second scan line of said signal, said accumulating means having shifting means responsive to said synchronization means, for accumulating said second plurality of statistical values for shifted positions within said second scan line relative to said first plurality of statistical values; (e) storage means for storing successive accumulated values associated with each of said plurality of video signals; (f) comparison means for comparing said accumulated values with said stored values associated with said selected video signal; and (g) indicating means for indicating a difference in said comparison, said indicating means including identifying means for identifying the selected video signal.
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14. A method for detecting motion comprising the steps of:
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receiving a video image; generating a plurality of statistical values from said video image, said plurality of statistical values comprising; a) a first statistical value corresponding to a first spatial region within the video image, and b) a second statistical value corresponding to a second spatial region within the video image, said second spatial region at least partially overlapping the first spatial region; comparing each of said first and second statistical values to spatially corresponding stored statistical values generated from a previous video image; and signalling that motion has been detected when a difference is recognized between said statistical values and said stored values. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification