Information extraction by mapping
First Claim
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1. An information extraction computer device for extracing information from a picture by mapping, comprising:
- converting means for detecting points in a picture on a spherical surface by physically detecting the points, determining coordinates of the points and storing the coordinates;
mapping means for mapping, according to a polar transformation mapping function, the points in the picture into great circles on the spherical surface, each of said great circle being defined by an intersection between the spherical surface and a mapping plane which is perpendicular to a radius connecting a center of a sphere defined by the spherical surface and the respective point on the spherical surface, and which mapping plane includes the center of the sphere; and
information extraction computation means for extracting information from the picture on the spherical surface on the basis of mapping function data of coordinate values of the points obtained by said mapping means.
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Abstract
An information extraction device including a coordinate transformation unit for transforming the coordinate values of points on a plane in question to the coordinate values of the points on a spherical surface corresponding to the points on the plane, and a mapping unit for mapping the points on the spherical surface to great circles. This information extraction device is applicable to the detection of the three-dimensional direction of a single line or a single plane existing in space.
86 Citations
28 Claims
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1. An information extraction computer device for extracing information from a picture by mapping, comprising:
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converting means for detecting points in a picture on a spherical surface by physically detecting the points, determining coordinates of the points and storing the coordinates; mapping means for mapping, according to a polar transformation mapping function, the points in the picture into great circles on the spherical surface, each of said great circle being defined by an intersection between the spherical surface and a mapping plane which is perpendicular to a radius connecting a center of a sphere defined by the spherical surface and the respective point on the spherical surface, and which mapping plane includes the center of the sphere; and information extraction computation means for extracting information from the picture on the spherical surface on the basis of mapping function data of coordinate values of the points obtained by said mapping means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An information extraction method for extracting information from a picture by mapping using a computer, comprising the steps of:
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converting points in a picture on a spherical surface into coordinates by physically detecting the points and storing coordinates of the points; mapping, according to a mapping polar transformation function, the points in the picture to great circles on the spherical surface, each of said great circles being defined by an intersection between the spherical surface and a plane which is perpendicular to a radius connecting a center of a sphere defined by the spherical surface and a point on the spherical surface and includes the center of the sphere; and extracting information from the picture on the spherical surface on the basis of mapping function data of coordinates of points obtained by said mapping step. - View Dependent Claims (11)
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12. An information extraction computer device for extracting information from a picture by mapping, comprising:
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mapping means for mapping, according to a mapping function, points on a spherical surface in correspondence to great circles, each of said great circles being defined by an intersection between the spherical surface and a plane which is perpendicular to a radius connecting the center of the spherical surface and the respective point on the spherical surface, and which plane include the center of the spherical surface, great circle mapping means for mapping each said great circle to a respective point on said spherical surface; and information extraction means for extracting information contained in said points in said mapping plane, corresponding to said great circles on the basis of said mapping function.
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13. An information extraction method for extracting information from a picture on a spherical surface by mapping using a computer, comprising the steps of:
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setting reference points in the picture; obtaining and storing mapping function data, corresponding to the set reference points, in a respective mapping plane; obtaining data of relative positions of points of said picture with respect to the reference points; shifting said mapping function data of the set reference points in said respective mapping plane based on said relative position data of said points; obtaining the respective mapping function data of said points in the picture from the result of said shifting; and extracting information contained in each of said points in said mapping plane on the basis of the mutual relationship between mapping functions. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An information extraction computer device for extracting information from a picture by mapping, comprising:
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mapping means for mapping, according to a mapping function, points on a spherical surface in correspondence to great circles, each of said great circles being defined by an intersection between the spherical surface and a plane which is perpendicular to a radius connecting a center of the spherical surface and the respective point on the spherical surface, and which mapping plane includes the center of the spherical surface; and
writing of a mapping function into the mapping plane is carried out by writing a mapping function have a bandwidth and differentiation values into addresses at endpoints of said bandwidth, the differentiation values written into the mapping plane are integrated, and said integrated value is again written into the mapping plane; andinformation extraction means for extracting information contained in said points in said mapping plane, corresponding to said great circles on the basis of the mapping function. - View Dependent Claims (25, 26, 27, 28)
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Specification