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Collimator based camera calibration method

A camera calibration and collimator technology, applied in image analysis, image data processing, measuring devices, etc., can solve problems such as the inability to obtain space control points and the cumbersome arrangement of cooperation signs

Active Publication Date: 2018-06-12
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

This invention solves the problem of cumbersome arranging cooperation marks in the traditional calibration method, and it is even impossible to obtain spatial control points under some large field of view conditions. The camera is calibrated by using a collimator to generate an infinite target uniformly covering the camera's field of view. , so the calibration method has high precision, simple and practical

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  • Collimator based camera calibration method
  • Collimator based camera calibration method
  • Collimator based camera calibration method

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Embodiment Construction

[0072] The present invention innovatively uses a precision goniometer to measure the angle and orientation information of the infinite target generated by the collimator, and then extracts the image coordinates corresponding to the image point of the infinite target to calibrate the camera;

[0073] The invention uses the angle and orientation information of the infinite target and the image coordinates of the corresponding image points generated by the collimator, and calculates the internal parameters of the camera according to the calibration method of the collinear equation. Then install and fix the camera with calibrated internal parameters to the working position, and use several control points for absolute orientation to solve the external parameters of the camera. The invention has good applicability to camera calibration under the condition of large and small visual fields, has important theoretical research significance and wide application prospect.

[0074] The pre...

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Abstract

The invention relates to a collimator based camera calibration method. An angle measuring instrument measures angle directional information of an infinite distance target generated by a collimator, and an internal parameter of the camera is calculated according to a collinear equation calibration method by combining an image coordinate of an image point corresponding to the infinite distance target. The camera whose internal parameter is calibrated is fixed in a working position, control points are used to carry out absolute orientation, and an external parameter of the camera can be solved. The method can be widely applied to the visual field, can be applied to calibration of traditional small and medium-sized visual fields and well as camera calibration in large-visual-field outfield condition, and has significance in theoretical researches and wide application prospects.

Description

technical field [0001] The invention mainly utilizes the precise angle measuring instrument to measure the angle pointing information of the infinite target generated by the collimator, and then combines the image coordinates of the corresponding image points of the infinite target to calibrate the camera. Background technique [0002] With the continuous development of science and technology, photogrammetry technology has been widely used in various precision measurement and motion measurement, involving aerospace, national defense test, survey and survey, transportation and other fields. Its main advantages over other measurement technologies lie in its remarkable features such as high precision, non-contact, motion and dynamic measurement, and real-time measurement. High-precision calibration of camera parameters is the basis for high-precision camera measurement, including internal parameters such as principal point and focal length, external parameters describing camera...

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Application Information

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IPC IPC(8): G06T7/80G01C25/00
CPCG01C25/00G06T7/80
Inventor 孙祥一蒋海军孙澜琼杜胜坚傅丹
Owner NAT UNIV OF DEFENSE TECH
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