Installing posture parameter auto extracting method of imaging device, and monitoring system using the imaging device
First Claim
1. An installing posture parameter auto extracting method of an imaging device, comprising:
- automatically extracting two lengths of linear components parallel to each other from data of an image taken by said imaging device;
extracting parameters indicating an installing posture of said imaging device on the basis of the two lengths of linear components;
transforming coordinates of the two lengths of linear components on a screen into coordinates on an imaginary plane in a real space;
calculating a distance between the two lengths of linear components on the imaginary plane; and
calculating a height of said imaging device on the basis of a ratio of the distance between the two lengths of linear components on the imaginary plane to an actual distance of the two lengths of linear components.
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Accused Products
Abstract
A monitoring system using an imaging device like a TV camera, etc. enhances a monitoring accuracy without involving manual operations and increasing costs for installing the monitoring system. Two lengths of linear components parallel to each other are extracted from data of an image taken by the imaging device. A rotational angle and an elevation angle of the imaging device are calculated from a positional relationship between those two lengths of linear components and a view point of the imaging device. Obtained is a ratio of a line-to-line distance between the two lengths of linear components when transforming coordinates of the two lengths of linear components on an image plane into coordinates on an imaginary plane to a line-to-line distance between the two lengths of linear components in a real space. A height of position from the plane for installing the imaging device is obtained from this ratio.
8 Citations
8 Claims
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1. An installing posture parameter auto extracting method of an imaging device, comprising:
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automatically extracting two lengths of linear components parallel to each other from data of an image taken by said imaging device;
extracting parameters indicating an installing posture of said imaging device on the basis of the two lengths of linear components;
transforming coordinates of the two lengths of linear components on a screen into coordinates on an imaginary plane in a real space;
calculating a distance between the two lengths of linear components on the imaginary plane; and
calculating a height of said imaging device on the basis of a ratio of the distance between the two lengths of linear components on the imaginary plane to an actual distance of the two lengths of linear components. - View Dependent Claims (2, 3)
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4. A method of extracting installing posture parameters of an imaging device in a monitoring system for detecting attributes of a monitoring target object on the basis of an image taken by said imaging device, comprising:
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automatically extracting two lengths of linear components parallel to each other from data of the image taken by said imaging device;
calculating the parameters indicating an installing posture of said imaging device on the basis of the two lengths of linear components;
transforming coordinates of the two lengths of linear components on a screen into coordinates on an imaginary plane in a real space;
calculating a distance between the two lengths of linear components on the imaginary plane;
calculating a height said imaging device on the basis of a ratio of the distance between the two lengths of linear components on the imaginary plane to an actual distance of the two lengths of linear components; and
converting attribute data of the monitoring target object on an image plane into attribute data adapted to a real space by using the installing posture parameters.
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5. A monitoring system, using an imaging device, for detecting attributes of a monitoring target object on the basis of an image taken by said imaging device, comprising:
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a posture parameter calculating unit for automatically extracting two lengths of linear components parallel to each other from data of the image taken by said imaging device, and calculating the posture parameters of said imaging device on the basis of the two lengths of linear components;
a coordinate transforming unit for transforming coordinates of the two lengths of linear components on a screen into coordinates on an imaginary plane in a real space;
a distance calculating unit for calculating a distance between the two lengths of linear components on the imaginary plane;
a height calculating unit for calculating a height of said imaging device on the basis of a ratio of the distance between the two lengths of linear components on the imaginary plane to an actual distance of the two lengths of linear components; and
an attribute data converting unit for converting attribute data of the monitoring target object on an image plane into attribute data adapted to a real space on the basis of the posture parameters. - View Dependent Claims (6, 7)
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8. A recording medium stored with a program for making a processing device execute:
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automatically extracting two lengths of linear components parallel to each other from data of an image taken by an imaging device;
extracting parameters indicating an installing posture of said imaging device on the basis of the two lengths of linear components;
transforming coordinates of the two lengths of linear components on a screen into coordinates on an imaginary plane in a real space;
calculating a distance between the two lengths of linear components on the imaginary plane; and
calculating a height of said imaging device on the basis of a ratio of the distance between the two lengths of linear components on the imaginary plane to an actual distance of the two lengths of linear components.
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Specification