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Algorithm using coplanar linear array to calibrate photogrammetric camera

A photogrammetry, linear array technology, applied in computing, image data processing, instruments, etc., can solve the problem of not considering the influence of the measured point and the camera imaging model, and achieve the effect of fast processing

Active Publication Date: 2016-10-12
BEIJING INFORMATION SCI & TECH UNIV
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Problems solved by technology

Most static or dynamic photogrammetry does not consider the influence of the distance between the measured point and the camera on the imaging model

Method used

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  • Algorithm using coplanar linear array to calibrate photogrammetric camera
  • Algorithm using coplanar linear array to calibrate photogrammetric camera
  • Algorithm using coplanar linear array to calibrate photogrammetric camera

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Embodiment Construction

[0043] The objects and functions of the present invention and methods for achieving the objects and functions will be clarified by referring to the exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below, and may be implemented in various forms. The essence of the description is only to help those skilled in the relevant art comprehensively understand the specific details of the present invention.

[0044] figure 1 It is the experimental principle diagram of calibrating the photogrammetric camera by using the coplanar linear array of the present invention, and the steps of calibrating the photogrammetric camera by using the coplanar linear array are as follows:

[0045] a) Establishing a coplanar linear array field of return light reflection for calibration of related distortion parameters;

[0046] According to an embodiment of the present invention, the step of establishing the retroreflective coplanar linear array ...

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Abstract

The invention provides an algorithm using a coplanar linear array to calibrate a photogrammetric camera. The method comprises the steps that a) a retroreflective coplanar linear array field which is simply referred to as a field and is used for the calibration of correlated distortion parameters is established; b) the camera to be calibrated is used to photograph the field in a first manner; c) the imaging model of any retroreflective line in the field is established, namely a mathematical relationship between image plane points on the line, linear parameters and orientation parameters in the camera is established; d) an error equation of the imaging model and the corresponding normal equation are solved, and a least squares adjustment technology is used to solve an adjustment result; and e) block operation is used to rapidly solve equations in the normal equation and the least squares solution of the normal equation.

Description

technical field [0001] The present invention relates to an algorithm for calibrating a photogrammetry camera, in particular to the imaging model and calibration of a camera when a large-area CCD or CMOS sensor is used for static or dynamic photogrammetry, or when the measured object has a non-negligible change in the depth of field of the camera. parameter method. Background technique [0002] An accurate camera imaging model can eliminate model system errors in photogrammetry and improve measurement accuracy. Most static or dynamic photogrammetry does not consider the influence of the distance between the measured point and the camera on the imaging model. However, early researchers' studies on imaging system aberrations have pointed out that distortion is directly related to magnification. Brown and Fryer studied the influence of magnification on the distortion of photogrammetry cameras, and calibrated the distortion parameters by the vertical line method, and verified t...

Claims

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Application Information

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IPC IPC(8): G06T7/00
Inventor 董明利孙鹏吕乃光王君燕必希庄炜
Owner BEIJING INFORMATION SCI & TECH UNIV
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