Method of calibrating paracatadioptric camera using image of single sphere and circular points

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

Inactive Publication Date: 2017-01-11
YUNNAN UNIV
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  • Summary
  • 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 of calibrating paracatadioptric camera using image of single sphere and circular points
  • Method of calibrating paracatadioptric camera using image of single sphere and circular points

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Experimental program
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Embodiment

[0053] The invention proposes a method for linearly determining internal parameters of a parabolic catadioptric camera by using a sphere in space as a target. 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.

[0054] The experimental template used in the calibration of parabolic catadioptric cameras based on spheres in space is a sphere in space, such as figure 1 As shown, the ball is . 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:

[0055] 1. Fit image boundary and target curve equation

[0056] The image size used in the present invention is . Use the parabolic catadioptric camera to shoot 3 experimental images of the target, read the images, use the Edge function in Matlab to extract...

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Abstract

The present invention relates to a method for calibrating a paracatadioptric camera using the images of a single sphere and circular points. According to the method, two different points are selected from the image of the sphere, so that two vanishing points are obtained; a straight line where the two vanishing points are located is a vanishing line, the images of the vanishing line and the image of the sphere intersect with the images of the circular points, and three images can provide the images of three circular points; and the inner parameters of the camera are solved through using the constraint of the images of the circular points for an absolute conic curve image. The method specifically includes the following steps of: fitting a mirror surface contour projection equation and a target projection equation; estimating an antipodal sphere image; determining the images of the circular points; and solving the inner parameters of the paracatadioptric camera. In a process of solving the inner parameters of the paracatadioptric camera, five inner parameters of the paracatadioptric camera are solved by using three images of a target shoot by the paracatadioptric camera.

Description

technical field [0001] The invention belongs to the field of computer vision, and relates to a method for solving internal parameters of a parabolic catadioptric camera by utilizing images of a sphere and a ring point in space. 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 establish a geometric imagi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 李远珍赵越
Owner YUNNAN UNIV
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