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Calibration method and calibration system of fish eye camera, and calibration plate

A technology of fisheye camera and calibration method, which is applied in image analysis, instrumentation, calculation, etc., and can solve the problems of circular spot center deviation, inability to effectively cover large fisheye viewing angles, and large wide angle range of fisheye cameras, etc.

Active Publication Date: 2017-06-09
NINGBO SUNNY OPOTECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple and convenient, and has good noise immunity, but when there is nonlinear distortion, the center of the circular spot will shift
[0005] In addition, the current target boards are all flat, and the wide-angle range of the fisheye camera is large, so it cannot effectively cover the large angle of view of the fisheye, which will cause positioning deviation

Method used

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  • Calibration method and calibration system of fish eye camera, and calibration plate
  • Calibration method and calibration system of fish eye camera, and calibration plate
  • Calibration method and calibration system of fish eye camera, and calibration plate

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Embodiment Construction

[0074] Such as Figure 1 to Figure 8 Shown is a fisheye camera calibration method, a calibration system and a target board according to a preferred embodiment of the present invention. The calibration system includes a target board 10 and a calibration host 30 for parameter testing and calibration of a fisheye camera 20 . The fisheye camera 20 is connected to the calibration host 30, such as a computer with a display 31, and the fisheye camera 20 shoots the target plate 10, and the image data obtained is analyzed by the calibration host 30. The calibration host 30 invokes preset calibration software to calibrate the fisheye camera 20 .

[0075] More specifically, as Figures 1 to 3 Shown is the fabrication process of the target 10 of the above preferred embodiment of the present invention. In this preferred embodiment of the present invention, unlike the prior art using a plane type target plate, but using a three-dimensional target plate, further, the target plate 10 of th...

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Abstract

The invention provides a calibration method and calibration system of a fish eye camera, and a calibration plate. The calibration method of a fish eye camera is characterized in that a fish eye camera shoots the characteristic pattern of a cylindrical stereo calibration plate, calls a nonlinear optimization algorithm, inputs the coordinates of characteristic points, and obtains parameters of the fish eye camera, based on a mathematical model for calibration; the characteristic pattern is obtained based on a spot pattern and based on a fish eye projection principle, and is arranged on a cylindrical surface; the calibration method of a fish eye camera can obtain the intrinsic parameters of the fish eye camera, by means of only less times of imaging of the calibration plate, such as one time, so that the intrinsic parameters of the fish eye camera can be used for correction of distortion of the fish eye camera.

Description

technical field [0001] The present invention provides a method for testing parameters of a fisheye camera, and in particular relates to a method for calibrating a fisheye camera using a three-dimensional cylindrical calibration cylinder as a target plate and a mathematical model based on the projection principle of the fisheye camera and a calibration system thereof. Background technique [0002] The imaging model of the camera expresses the corresponding relationship between pixels and the external space, and is one of the key technologies of image processing and machine vision. At present, there are two main categories of mathematical models for fisheye cameras. One is an analytical model based on the projection principle of the fisheye camera. This kind of model often contains some parameters with clear physical meaning, such as focal length, optical axis center coordinates, etc. However, such models are often too complex and contain many external parameters, making it ...

Claims

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Application Information

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IPC IPC(8): G06T7/80
Inventor 蒙诚哲潘锋杜亚凤
Owner NINGBO SUNNY OPOTECH CO LTD
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