FOREGROUND OBJECT TRACKING
First Claim
1. A computer-implemented method for tracking a detected foreground patch that depicts a foreground object in a sequence of video frames captured by a video camera, the method comprising:
- receiving a video frame in the sequence of video frame;
detecting a foreground patch that depicts a foreground object in the video frame to produce a detected first foreground patch;
receiving a motion flow field for the video frame that includes an angle and magnitude value for the first detected foreground patch in the video frame relative to the first detected foreground patch in a previous video frame;
categorizing the first detected foreground patch as being associated with an existing tracked foreground patch or as a discovered foreground patch based on a combination of the motion flow field and features of the first detected foreground patch; and
updating tracking data that is used to track the foreground object in the sequence of video frames.
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0 Petitions
Accused Products
Abstract
Techniques are disclosed for detecting foreground objects in a scene captured by a surveillance system and tracking the detected foreground objects from frame to frame in real time. A motion flow field is used to validate foreground objects(s) that are extracted from the background model of a scene. Spurious foreground objects are filtered before the foreground objects are provided to the tracking stage. The motion flow field is also used by the tracking stage to improve the performance of the tracking as needed for real time surveillance applications.
85 Citations
20 Claims
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1. A computer-implemented method for tracking a detected foreground patch that depicts a foreground object in a sequence of video frames captured by a video camera, the method comprising:
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receiving a video frame in the sequence of video frame; detecting a foreground patch that depicts a foreground object in the video frame to produce a detected first foreground patch; receiving a motion flow field for the video frame that includes an angle and magnitude value for the first detected foreground patch in the video frame relative to the first detected foreground patch in a previous video frame; categorizing the first detected foreground patch as being associated with an existing tracked foreground patch or as a discovered foreground patch based on a combination of the motion flow field and features of the first detected foreground patch; and updating tracking data that is used to track the foreground object in the sequence of video frames. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A computer-readable storage medium containing a program, which when executed on a processor, performs an operation for tracking a detected foreground patch that depicts a foreground object in a sequence of video frames captured by a video camera, the operation comprising:
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receiving a video frame in the sequence of video frame; detecting a foreground patch that depicts a foreground object in the video frame to produce a detected first foreground patch; receiving a motion flow field for the video frame that includes an angle and magnitude value for the first detected foreground patch in the video frame relative to the first detected foreground patch in a previous video frame; categorizing the first detected foreground patch as being associated with an existing tracked foreground patch or as a discovered foreground patch based on a combination of the motion flow field and features of the first detected foreground patch; and updating tracking data that is used to track the foreground object in the sequence of video frames. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A system, comprising:
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a video input source configured to provide a sequence of video frames; a processor; and
a memory containing a program, which, when executed on the processor is configured to perform an operation for tracking a detected foreground patch that depicts a foreground object in the sequence of video frames, the operation comprising;receiving a video frame in the sequence of video frame; detecting a foreground patch that depicts a foreground object in the video frame to produce a detected first foreground patch; receiving a motion flow field for the video frame that includes an angle and magnitude value for the first detected foreground patch in the video frame relative to the first detected foreground patch in a previous video frame; categorizing the first detected foreground patch as being associated with an existing tracked foreground patch or as a discovered foreground patch based on a combination of the motion flow field and features of the first detected foreground patch; and updating tracking data that is used to track the foreground object in the sequence of video frames. - View Dependent Claims (17, 18, 19, 20)
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Specification