Precise calibration method of digital camera projection center position based on photogrammetry technology

A projection center and digital camera technology, which is applied in the field of accurate calibration of the projection center position of digital cameras, can solve the problems of high equipment and environment requirements, high site requirements, complex implementation process, etc., and achieve the effect of strong use value and easy operation and use

Inactive Publication Date: 2017-11-14
THE PLA INFORMATION ENG UNIV
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AI Technical Summary

Problems solved by technology

The interferometric comparison measurement method needs to rely on precision optical instruments, has high requirements on equipment and environment, the implementation process is complicated, and it has high requirements on the site
The conventional method of estimating the projection center position based on the image sensor position and focal length has poor accuracy

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  • Precise calibration method of digital camera projection center position based on photogrammetry technology
  • Precise calibration method of digital camera projection center position based on photogrammetry technology
  • Precise calibration method of digital camera projection center position based on photogrammetry technology

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Embodiment Construction

[0015] The specific implementation manners of the present invention will be further described in detail below in combination with specific situations.

[0016] The precise calibration method of digital camera projection center position based on photogrammetry technology in the present invention is a method for precise calibration of camera projection center position based on the photogrammetry method of backlight reflection marks, and the method integrates to realize control point mark image center measurement, High-precision camera calibration and accurate calibration of the projection center are three tasks. The position determination accuracy of the camera projection center is better than 5mm.

[0017] The specific implementation method is as follows:

[0018] (1) Arrange at least 200 retroreflection measurement marks on the measurement plane, at least 12 control point marks and 12 code marks at the same time, and set a directional target and a reference ruler in front of t...

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Abstract

The invention relates to a digital camera projection center position precision calibration method based on a photogrammetric technology, and aims at effectively solving the problems of high precision and operability. The method comprises the steps that a return light reflection measurement mark, a control point mark, an encoding mark, a directional target and a standard ruler are laid to form a calibration field; an electronic theodolite and a to-be-inspected camera are arranged at the position 3 meters away from the calibration field, and the return light reflection measurement mark is stuck to a camera lens; the calibration field is photographed by the camera at the different horizontal positions to obtain multiple photos, the calibration field is photographed by the to-be-inspected camera at the different positions in front of the calibration field at different attitudes, and data of the control point mark are extracted from the photos to form calibration data; the coordinates of a central image point of the control point mark are corrected and resolved to obtain three projection center positions. According to the method, control point mark image center measurement, high-precision camera calibration and projection center precision measurement can be integrally achieved, and the calibration precision of the projection center positions is higher than 5 mm.

Description

technical field [0001] The invention relates to the field of camera imaging, in particular to a method for accurately marking the projection center position of a digital camera based on photogrammetry technology. Background technique [0002] In the research and application of photogrammetry, the imaging relationship of geometric optics has laid the theoretical foundation of analytical photogrammetry optics. The ideal optical system attributes the photographed film to the central projection of the photographed object, which is essentially the theory of "three collinear points", that is The image point, the projection center and the corresponding object point are located on the same straight line, based on which a whole set of analytical relations of conventional photogrammetry is established. [0003] The purpose of close-range photogrammetry is to use control points to inversely calculate the spatial coordinates of external points, and does not care about the specific locat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 丛佃伟许其凤吕志伟李军正张同成
Owner THE PLA INFORMATION ENG UNIV
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