ARTICULATED OBJECT REGIONARTICULATED OBJECT REGION DETECTION APPARATUS AND METHOD OF THE SAME
First Claim
1. An articulated object region detection apparatus which detects a region having an articulated motion, using trajectories which correspond, in one-to-one relationship, to regions included in a moving object in a video, said articulated object region detection apparatus comprising:
- a subclass classification unit configured to classify trajectories into subclasses each of which is a group of similar trajectories, each of the trajectories being a trajectory of a motion of a block and being over pictures included in the video, the block including one or more pixels each of which constitutes the pictures;
a distance calculating unit configured to calculate, for each of the subclasses, a point-to-point distance and a geodetic distance, the point-to-point distance being a distance directly connecting a first trajectory that belongs to the subclass and a second trajectory that belongs to another one of the subclasses, the geodetic distance being a distance of a path that passes through, as a relay point, a trajectory other than the first trajectory and the second trajectory, to reach the second trajectory from the first trajectory; and
a region detection unit configured to detect, as a region having the articulated motion, two subclasses that include trajectories corresponding to two regions connected via a same articulation and including the articulated motion, based on a temporal change in the point-to-point distance and a temporal change in the geodetic distance between two given subclasses among the subclasses.
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Abstract
An articulated object region detection apparatus includes: a subclass classification unit which classifies trajectories into subclasses; a distance calculating unit which calculates, for each of the subclasses, a point-to-point distance and a geodetic distance between the subclass and another subclass; and a region detection unit which detects, as a region having an articulated motion, two subclasses to which trajectories corresponding to two regions connected via the same articulation and indicating the articulated motion belong, based on a temporal change in the point-to-point distance and a temporal change in the geodetic distance between two given subclasses.
36 Citations
31 Claims
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1. An articulated object region detection apparatus which detects a region having an articulated motion, using trajectories which correspond, in one-to-one relationship, to regions included in a moving object in a video, said articulated object region detection apparatus comprising:
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a subclass classification unit configured to classify trajectories into subclasses each of which is a group of similar trajectories, each of the trajectories being a trajectory of a motion of a block and being over pictures included in the video, the block including one or more pixels each of which constitutes the pictures; a distance calculating unit configured to calculate, for each of the subclasses, a point-to-point distance and a geodetic distance, the point-to-point distance being a distance directly connecting a first trajectory that belongs to the subclass and a second trajectory that belongs to another one of the subclasses, the geodetic distance being a distance of a path that passes through, as a relay point, a trajectory other than the first trajectory and the second trajectory, to reach the second trajectory from the first trajectory; and a region detection unit configured to detect, as a region having the articulated motion, two subclasses that include trajectories corresponding to two regions connected via a same articulation and including the articulated motion, based on a temporal change in the point-to-point distance and a temporal change in the geodetic distance between two given subclasses among the subclasses. - 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)
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29. An articulated object region detection method of detecting a region having an articulated motion, using trajectories which correspond, in one-to-one relationship, to regions included in a moving object in a video, said articulated object region detection method comprising:
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classifying trajectories into subclasses each of which is a group of similar trajectories, each of the trajectories being a trajectory of a motion of a block and being over pictures included in the video, the block including one or more pixels each of which constitutes the pictures; calculating, for each of the subclasses, a point-to-point distance and a geodetic distance, the point-to-point distance being a distance directly connecting a first trajectory that belongs to the subclass and a second trajectory that belongs to another one of the subclasses, the geodetic distance being a distance of a path that passes through, as a relay point, a trajectory other than the first trajectory and the second trajectory, to reach the second trajectory from the first trajectory; and detecting, as a region having the articulated motion, two subclasses that include trajectories corresponding to two regions connected via a same articulation and including the articulated motion, based on a temporal change in the point-to-point distance and a temporal change in the geodetic distance between two given subclasses among the subclasses. - View Dependent Claims (30)
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31. An articulated object region detection apparatus which detects a region having an articulated motion, using trajectories which correspond, in one-to-one relationship, to regions included in a moving object in a video, said articulated object region detection apparatus comprising:
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a subclass obtaining unit configured to obtain classification information that indicates a result of classifying trajectories into subclasses each of which is a group of similar trajectories, each of the trajectories being a trajectory of a motion of a block and being over pictures included in the video, the block including one or more pixels each of which constitutes the pictures; a distance calculating unit configured to calculate, for each of the subclasses, a point-to-point distance and a geodetic distance, based on the obtained classification information, the point-to-point distance being a distance directly connecting a first trajectory that belongs to the subclass and a second trajectory that belongs to another one of the subclasses, the geodetic distance being a distance of a path that passes through, as a relay point, a trajectory other than the first trajectory and the second trajectory, to reach the second trajectory from the first trajectory; and a region detection unit configured to detect, as a region having the articulated motion, two subclasses that include trajectories corresponding to two regions connected via a same articulation and including the articulated motion, based on a temporal change in the point-to-point distance and a temporal change in the geodetic distance between two given subclasses among the subclasses.
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Specification