Method and apparatus for measuring dwell time of objects in an environment
First Claim
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1. A method for tracking objects entering and exiting an environment, the method comprising:
- obtaining image data for one or more fields of view covering one or more paths by way of which objects can enter or exit the environment wherein the objects are distinguishable from one another on the basis of one or more features in the image data;
identifying objects of interest represented in the image data;
for each of the objects, determining from the image data whether the object is entering or exiting the environment and generating a signature for the object based, at least in part, on the image data; and
after generating one or more entry signatures for objects determined to be entering the environment and at least one exit signature for objects determined to be exiting the environment, matching the at least one exit signature to the one or more entry signatures, such that each matched exit signature corresponds with one matched entry signature;
wherein matching the at least one exit signature to the one or more entry signatures comprises, after generating each of the at least one exit signatures for objects determined to be exiting the environment;
matching the exit signature to the one or more entry signatures to identify a corresponding entry signature that provides a best match to the exit signature; and
, after identifying the corresponding entry signature, checking a plurality of previously matched exit signatures and corresponding previously matched entry signatures to determine whether rematching one or more of the previously matched exit signatures would provide better overall matching between a plurality of available exit signatures and the one or more entry signatures.
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Abstract
A method for tracking objects entering and exiting an environment comprises providing stereo vision cameras positioned proximate to the paths to enter the environment, such that the stereo vision fields associated with the cameras substantially cover the paths. Using image data obtained by the stereo vision cameras, entry signatures are determined for objects entering the environment and exit signatures are obtained for objects exiting the environment. At any time after the determination of at least one exit signature, exit signatures are matched with the set of available entry signatures. Matching may be performed according to a variety of techniques.
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Citations
40 Claims
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1. A method for tracking objects entering and exiting an environment, the method comprising:
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obtaining image data for one or more fields of view covering one or more paths by way of which objects can enter or exit the environment wherein the objects are distinguishable from one another on the basis of one or more features in the image data; identifying objects of interest represented in the image data; for each of the objects, determining from the image data whether the object is entering or exiting the environment and generating a signature for the object based, at least in part, on the image data; and after generating one or more entry signatures for objects determined to be entering the environment and at least one exit signature for objects determined to be exiting the environment, matching the at least one exit signature to the one or more entry signatures, such that each matched exit signature corresponds with one matched entry signature; wherein matching the at least one exit signature to the one or more entry signatures comprises, after generating each of the at least one exit signatures for objects determined to be exiting the environment;
matching the exit signature to the one or more entry signatures to identify a corresponding entry signature that provides a best match to the exit signature; and
, after identifying the corresponding entry signature, checking a plurality of previously matched exit signatures and corresponding previously matched entry signatures to determine whether rematching one or more of the previously matched exit signatures would provide better overall matching between a plurality of available exit signatures and the one or more entry signatures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification
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Current AssigneeFLIR Commercial Systems Incorporated (Teledyne Technologies Incorporated)
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Original AssigneePoint Greay Research
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InventorsSteenburgh, Malcolm, Tucakov, Vladimir, Ku, Shyan, Murray, Don, Barman, Rod
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Primary Examiner(s)Werner; Brian
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Assistant Examiner(s)LAVIN, CHRISTOPHER L
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Application NumberUS10/187,438Publication NumberTime in Patent Office1,666 DaysField of SearchNoneUS Class Current382/103CPC Class CodesG06T 2207/10012 Stereo imagesG06T 7/285 using a sequence of stereo ...G06V 10/62 relating to a temporal dime...G06V 20/53 Recognition of crowd images...H04N 13/239 using two 2D image sensors ...H04N 13/243 using three or more 2D imag...H04N 13/257 Colour aspectsH04N 2013/0081 Depth or disparity estimati...
