SEARCH METHOD, SEARCH PROGRAM, AND SEARCH DEVICE
First Claim
1. A search method to be performed by a computer, the search method comprising:
- acquiring a first-dimensional feature vector stored in a database; and
searching for parameters by which a position of the feature vector to be mapped onto a surface of a sphere is concentrated onto a hemisphere of the sphere when the feature vector is mapped onto the surface of the sphere on the basis of the parameters including an intersection and a distance, the intersection at which a feature space and a straight line passing through the sphere present in a space greater in dimension by one or more than the feature space intersect, the distance being from a predetermined point of the sphere to the feature space.
1 Assignment
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Accused Products
Abstract
A search device according to an embodiment maps a feature vector onto a hyper-sphere on the basis of parameters which include an intersection and a distance, with the intersection at which an m-dimensional feature space and a straight line passing through the hyper-sphere present in a space greater in dimension than m intersect and the distance being from the north pole of the hyper-sphere to the feature space. In this case, the search device searches for the parameters which allow the positions of feature vectors mapped onto the hyper-sphere to be concentrated on a predetermined hemisphere of the hyper-sphere.
29 Citations
18 Claims
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1. A search method to be performed by a computer, the search method comprising:
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acquiring a first-dimensional feature vector stored in a database; and searching for parameters by which a position of the feature vector to be mapped onto a surface of a sphere is concentrated onto a hemisphere of the sphere when the feature vector is mapped onto the surface of the sphere on the basis of the parameters including an intersection and a distance, the intersection at which a feature space and a straight line passing through the sphere present in a space greater in dimension by one or more than the feature space intersect, the distance being from a predetermined point of the sphere to the feature space. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A computer-readable recording medium having stored therein a search program for causing a computer to execute a process including:
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acquiring a first-dimensional feature vector stored in a database; and searching for parameters by which a position of the feature vector to be mapped onto a surface of a sphere is concentrated onto a hemisphere of the sphere when the feature vector is mapped onto the surface of the sphere on the basis of the parameters including an intersection and a distance, the intersection at which a feature space and a straight line passing through the sphere present in a space greater in dimension by one or more than the feature space intersect, the distance being from a predetermined point of the sphere to the feature space. - View Dependent Claims (8, 9, 10, 11)
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12. A search device comprising:
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a memory; and a processor coupled to the memory, wherein the processor executes a process comprising; acquiring a first-dimensional feature vector stored in a database; and searching for parameters by which a position of the feature vector to be mapped onto a surface of a sphere is concentrated onto a hemisphere of the sphere when the feature vector is mapped onto the surface of the sphere on the basis of the parameters including an intersection and a distance, the intersection at which a feature space and a straight line passing through the sphere present in a space greater in dimension by one or more than the feature space intersect, the distance being from a predetermined point of the sphere to the feature space. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification