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Method and apparatus for determination and visualization of player field coverage in a sporting event
| Details |
Inventors: Carlbom, Ingrid B.; Jean, Yves D.; Pingali, Sarma V G K;
Assignee: Lucent Technologies Inc. (Murray Hill, NJ)
Primary Examiner: Le; Vu
Assistant Examiner:
Attorney, Agent or Firm:
A method and apparatus for deriving an occupancy map reflecting an athlete's coverage of a playing area based on real time tracking of a sporting event. The method according to the present invention includes a step of obtaining a spatio-temporal trajectory corresponding to the motion of an athlete and based on real time tracking of the athlete. The trajectory is then mapped over the geometry of the playing area to determine a playing area occupancy map indicating the frequency with which the athlete occupies certain areas of the playing area, or the time spent by the athlete in certain areas of the playing area. The occupancy map is preferably color coded to indicate different levels of occupancy in different areas of the playing area, and the color coded map is then overlaid onto an image (such as a video image) of the playing area. The apparatus according to the present invention includes a device for obtaining the trajectory of an athlete, a computational device for obtaining the occupancy map based on the obtained trajectory and the geometry of the playing area, and devices for transforming the map the a camera view, generating a color (or other visually differentiable) coded version of the occupancy map, and overlaying the color coded map on a video image of the playing area. In particular, the spatio-temporal trajectory may be obtained by an operation on a video image of the sporting event, in which motion regions in the image are identified, and feature points on the regions are tracked as they move, thereby defining feature paths. The feature paths, in turn, are associated in clusters, which clusters generally correspond to the motion of some portion of the athlete (e.g., arms, legs, etc.). The collective plurality of clusters (i.e., the trajectory) corresponds with the motion of the athlete as a whole. |
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DETAILED DESCRIPTION The present invention provides, most generally, a method and apparatus for tracking moving objects, particularly athletes engaged in sporting activities.
More particularly, the invention provides an apparatus and method for obtaining information corresponding to the athlete(s) and/or sporting activity being tracked.
In one embodiment of the present invention, such information is performance statistics for an athlete derived from real time tracking of that athlete.
In another embodiment, such information is an occupancy map, which is preferably visually manifested, corresponding to the frequency with which an athlete occupies particular regions of a playing field, or the time spent in particular regions of the playing field.
In yet another embodiment of the present invention, such information is embodied in a computer-generated replay of the sporting event (or some part thereof) using computer generated characters moving in accordance with motion data collected from real time tracking of the sporting event.
In particular, the present invention is intended to be especially useful for enhancing television coverage of sporting events.
The method according to the present invention includes the steps of matching and merging a select feature path (representing the motion of the one of usually a plurality of local features of an athlete) with a candidate cluster of feature paths chosen from a plurality of preexisting clusters representing motion of the athlete or object.
The select feature path has a portion concurrent or overlapping in time with some of the clusters in the plurality of clusters.
The candidate cluster is preferably chosen as the cluster closest in distance to the select path.
Once the candidate cluster is chosen and the select feature path merged therewith, the parameters of the candidate cluster are updated based on the parameters of the select path.
The distance between the select path and the preexisting clusters is calculated in accordance with a function having two components
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