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Field-related distortion calibration method of photogrammetric camera

A distortion calibration and photogrammetry technology, applied in image data processing, instruments, calculations, etc., can solve problems such as neglect, achieve the effect of ensuring measurement accuracy, eliminating system errors, and simplifying the calibration process

Active Publication Date: 2016-09-28
BEIJING INFORMATION SCI & TECH UNIV
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Problems solved by technology

Applying this model and calibration method directly to large-scale stereo measurement will produce huge errors. The root cause is that the relationship between distortion, object distance and focus state is ignored, and the distortion parameter is mistakenly believed to be constant.

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  • Field-related distortion calibration method of photogrammetric camera
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  • Field-related distortion calibration method of photogrammetric camera

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Embodiment Construction

[0036] 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.

[0037] The invention studies the model of the distortion parameter of the imaging point caused by the change of the object distance, and proposes a method for calibrating the distortion model in a more general defocus state, aiming at the industrial measurement camera in the fixed focus state.

[0038] The object to be measured in the present invention has a large volume and a large depth range in the direction of the optical axis of the camera, and target points at different distances have different distortion parameters on...

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Abstract

The invention provides a field-related distortion calibration method of a photogrammetric camera in an out-of-focus state. The method includes steps of a) establishing an echo light reflection co-plane linear array field used for field-related distortion calibration; b) adjusting the focusing state of the to-be-calibrated camera according to the field depth of a survey environment and the distance requirement and fixing an imaging system of the camera so as to disable the focusing function; c) establishing a field-related radial distortion model in an arbitrary focusing state; d) calibrating the field-related distortion calibration parameters, namely, radial distortion parameters, in two different distances and deducing distortion parameters of space points in other arbitrary distance on a camera image plane; e) utilizing the radial distortion parameters obtained in step d) for calculating radial distortion volume in different imaging diameters.

Description

technical field [0001] The invention relates to a camera distortion parameter calibration method, in particular to a field-related distortion calibration method of a photogrammetry camera when a plurality of industrial cameras are used for large-scale and dynamic three-dimensional measurement. Background technique [0002] With the continuous progress of industry, the relationship between industry and aerospace, military, engineering construction, and new energy development is getting closer and closer, and various large-scale, high-precision, real-time dynamic and even non-contact measurement requirements are also emerging and increasing. , photogrammetry has been widely tried and applied in foreign related fields. [0003] At present, the most widely used nonlinear distortion model includes radial distortion, centrifugal distortion and various additional distortions. Applying this model and calibration method directly to large-scale stereo measurement will produce huge er...

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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