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Calibration target device and calibration method for three-dimensional ice-shaped digital image system

A digital image and calibration target technology, which is applied in measuring devices, image analysis, image data processing, etc., can solve the problems of measurement error, camera lens distortion, etc., and achieve the effects of improving experimental efficiency, stable performance, and convenient disassembly and assembly

Inactive Publication Date: 2012-01-18
BEIHANG UNIV
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Problems solved by technology

[0004] Due to the low ambient temperature of the icing test, it will have a distortion effect on the camera lens, so the internal and external parameters of the camera calibrated at normal temperature and their relative positions will change at low temperatures, resulting in measurement errors

Method used

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  • Calibration target device and calibration method for three-dimensional ice-shaped digital image system
  • Calibration target device and calibration method for three-dimensional ice-shaped digital image system
  • Calibration target device and calibration method for three-dimensional ice-shaped digital image system

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] The three-dimensional ice shape detector (its structure refers to the content disclosed in the patent application No. 201010159240.8) needs to calibrate its camera before use, so as to determine the mapping relationship between the shape and distance of the measured object and the camera image. In order to convert image information in multiple camera coordinate systems in the image processing computer to achieve data splicing and obtain a complete three-dimensional ice-shaped digital image in one image, the relative positional relationship of multiple cameras must be calibrated.

[0031] see figure 1 , Figure 1A As shown, a three-dimensional ice shape digital image system includes an image processing computer, a three-dimensional ice shape detector and a calibration target assembly.

[0032] An image calibration method is run in the image computer, ...

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Abstract

The invention discloses a calibration target device and a calibration method for a three-dimensional ice-shaped digital image system. The calibration target device comprises a rotary cloud deck, a lampstand, a movable calibration assembly and a calibration plate, wherein the rotary cloud deck is arranged on the lampstand; the rotary cloud deck is provided with the movable calibration assembly; and the movable calibration assembly is provided with the calibration plate. By adopting the calibration device, the on-site rapid calibration of a three-dimensional ice-shaped detector can be realized, and the calibration on the internal parameter and the relative positional relation of a camera can be finished through acquiring several images at a time, thereby, the experiment efficiency is greatly improved. By adopting the mechanical device disclosed by the invention, a traditional calibration mode of holding a free target is changed, the calibration error brought by the jitter of hands is avoided, and the calibration precision is improved. Moreover, the device not only is capable of realizing the calibration of a three-dimensional ice-shaped detector but also can be used as a fixed platform for an object to be measured, thereby, the integrated design of the calibration and the measurement is realized, and the manufacturing material and the processing cost of the device are saved.

Description

technical field [0001] The present invention relates to a calibration device for measurement, more particularly, refers to a method that uses multiple cameras on a three-dimensional ice shape detector to collect feature points on a calibration target, and finally realizes the calibration method through an image processing computer. Background technique [0002] Aircraft surface icing detection technology is mainly to install icing detectors on positions where the aircraft surface is prone to icing to determine whether the surface of the aircraft is icing and the thickness of the icing during flight, and to provide icing signals, but does not include The measurement of ice shape, however, the ice shape on the surface of aircraft components has an important impact on its aerodynamic, stability and other characteristics. [0003] Prediction of icing ice shape on the surface of aircraft components is an important content of aircraft icing research. At present, the three-dimensi...

Claims

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Application Information

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IPC IPC(8): G01B11/24G06T7/00
Inventor 常士楠刘朝阳陈杜管章杰赵媛媛黎明中
Owner BEIHANG UNIV
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