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Method for calibrating parabolic refraction-reflection camera via intersection image of two spheres and images of circular ring points

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

Inactive Publication Date: 2016-02-03
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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  • Method for calibrating parabolic refraction-reflection camera via intersection image of two spheres and images of circular ring points
  • Method for calibrating parabolic refraction-reflection camera via intersection image of two spheres and images of circular ring points
  • Method for calibrating parabolic refraction-reflection camera via intersection image of two spheres and images of circular ring points

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Experimental program
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Embodiment

[0072] The present invention proposes a method for using two spheres in space as targets, and the projections of the targets on the image plane of the parabolic catadioptric camera intersect, 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] Based on the double sphere in space, the experimental template used to calibrate the parabolic catadioptric camera is a double sphere in space, and the projections on the image plane are intersecting, 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 target c...

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Abstract

The invention relates to a method for calibrating a parabolic refraction-reflection camera via an intersection image of two spheres and images of circular ring points. The parabolic refraction-reflection camera shoots a target to obtain one image, a main point is determined via four groups of antipodal image points corresponding to solid and virtual intersection points in a spherical image in the refraction-reflection image and solid and virtual intersection points of an antipodal spherical image, a disappearance line of a plane, where two small parallel projection circles are placed in a unit visual sphere, of the two spheres is solved, images of the circular ring points in the plane are determined, and finally, the circular ring points are used to solve other inner parameters of the camera according to limitations of the inner parameters. The method of the invention can be used to realize full-automatic calibration, and reduce errors caused by measurement in the calibration process. Due to the fact that the projection contours of the spheres can be completely extracted from the images, 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 images of double spheres and ring points which are mutually blocked. 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 esta...

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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