Calibration method for telecentric camera

A telecentric camera and calibration method technology, applied in the field of optical measurement, can solve the problems of slow speed and poor robustness, and achieve the effect of reducing calibration error and improving measurement accuracy

Inactive Publication Date: 2017-08-08
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The traditional camera calibration method has high precision, but the calibration speed is slow; the camera self-calibration method only needs to use the corresponding relationship between multiple environmental images during the camera movement process, and does not need a specific calibration reference object; compared to The disadvantag

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  • Calibration method for telecentric camera
  • Calibration method for telecentric camera
  • Calibration method for telecentric camera

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0033] The telecentric camera calibration method provided in the embodiment specifically includes the following steps:

[0034] (1) Establish a telecentric camera projection model and a telecentric camera projection matrix; figure 1 As shown, the projection system of the telecentric camera in the present embodiment includes two bi-telecentric objective lenses L1, L2, an aperture stop, and a CCD...

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Abstract

The invention belongs to the technical field of optical measurement, and discloses a calibration method for a telecentric camera. The method comprises the following steps of (1) establishing a world coordinate system, a camera coordinate system, an image coordinate system and a pixel coordinate system in the projection system of a telecentric camera; (2) extracting feature points in a calibration plate image shot by the telecentric camera and figuring out internal parameters; (3) acquiring the difference between the actual coordinate of a calibration point in the image coordinate system and the coordinate of the calibration point of the world coordinate system projected in the image coordinate system during the distortion of the telecentric camera, figuring out the minimum value of the difference through the Levenberg-Marquardt algorithm, and obtaining the distortion coefficient of the telecentric camera at the minimum value. Based on the calibration method for the telecentric camera, the internal parameters and the external parameters of the telecentric camera are accurately obtained. Therefore, the calibration accuracy of the telecentric camera is improved.

Description

technical field [0001] The invention belongs to the technical field of optical measurement, and more specifically relates to a calibration method for a telecentric camera. Background technique [0002] As a kind of optical measurement, CCD (Charge Coupled Device) imaging technology is the key research direction of computer vision, and camera calibration is an essential step in CCD imaging technology. The process of camera calibration is the process of estimating the internal and external parameters of the camera, that is, estimating the internal parameters of the camera, such as focal length, magnification, distortion coefficient, etc. The external parameters include the rotation matrix and translation vector of the camera relative to the world coordinate system and Relative poses between cameras in a multi-camera stereo vision system. Accurate calibration of camera internal and external parameters can directly improve measurement accuracy. Because the telecentric lens has...

Claims

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Application Information

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IPC IPC(8): G06T7/80
CPCG06T2207/30244
Inventor 廖广兰刘强陈科鹏史铁林汤自荣王西彬
Owner HUAZHONG UNIV OF SCI & TECH
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