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Image calibration parabolic refraction and reflection camera using double-ball tangent image and annular points

A catadioptric and camera technology, applied in the field of computer vision, can solve the problems of complex ring point selection

Inactive Publication Date: 2016-01-27
YUNNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the selection of the image of the ring point in this document is more complicated

Method used

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  • Image calibration parabolic refraction and reflection camera using double-ball tangent image and annular points
  • Image calibration parabolic refraction and reflection camera using double-ball tangent image and annular points
  • Image calibration parabolic refraction and reflection camera using double-ball tangent image and annular points

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Embodiment

[0072] The invention proposes a method for using the double spheres in space as targets, and the targets are tangent on the image plane, and using the target linearity to determine the internal parameters of the parabolic catadioptric camera. The experimental template structural schematic diagram that the present invention adopts is as figure 1 shown. The implementation of the present invention will be described in more detail with an example below.

[0073] The experimental template used in the calibration of the parabolic catadioptric camera based on the double sphere in space is a double sphere in space, and the projection of the double sphere on the imaging plane of the parabolic catadioptric camera is tangent, such as figure 1 As shown, the two balls are and . Utilize the method among the present invention to carry out calibration for the parabolic catadioptric camera that is used for experiment, concrete steps are as follows:

[0074] 1. Fit image boundary and ta...

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Abstract

The invention relates to an image calibration parabolic refraction and reflection camera using a double-ball tangent image and annular points. The parabolic refraction and reflection camera is used for shooting an image using double balls as a target, and in addition, the target images are tangent. A main point is determined through three groups of antipodal image points correspondingly formed by solid and virtual intersecting points in the ball image of the refraction and reflection image and the solid and virtual intersecting points of an antipodal ball image; on the basis of obtaining the main point, the disappearance line of the double balls on a located plane of two groups of parallel projection small circles on a unit visual ball is solved, so that the images of the annular points on the plane are determined; and finally, the restriction of the images of the annular points on parameters in the camera are used for solving the rest parameters in the camera. The method provided by the invention can be used for realizing the fully-automatic calibration; and the errors due to measurement in the calibration process are reduced. The projection contour line of the ball can be completely extracted in the image, so that the calibration precision of the camera is improved.

Description

technical field [0001] The invention belongs to the field of computer vision, and relates to a method for calculating internal parameters of a parabolic catadioptric camera by using a tangent image of a double sphere and an image of a ring point. Background technique [0002] The central task of computer vision is to understand images, and its ultimate goal is to enable computers to have the ability to recognize three-dimensional environmental information through two-dimensional images. This ability will not only enable the machine to perceive the geometric information of objects in a three-dimensional environment including shape, posture, motion, etc., but also describe, store, recognize and understand them. Camera calibration is to determine the mapping relationship from a three-dimensional space point to its two-dimensional image point, which is an essential step in many computer vision applications. In order to determine this mapping process, it is necessary to establis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 王亚林赵越
Owner YUNNAN UNIV
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