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Double-target calibration device of thermal infrared imager and visible light camera and use method of double-target calibration device

A technology of infrared thermal imaging camera and calibration device, which is applied in the directions of instruments, image enhancement, image analysis, etc., can solve problems such as difficult application and complicated manufacturing cost, and achieve easy promotion and implementation, elimination of principle errors, and wide application range Effect

Pending Publication Date: 2021-09-24
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing calibration methods are only applicable to the calibration of dual visible light cameras, and the calibration methods of a very small number of thermal imaging cameras and visible light cameras are too complicated or the manufacturing cost is too high to be applied in practice.

Method used

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  • Double-target calibration device of thermal infrared imager and visible light camera and use method of double-target calibration device
  • Double-target calibration device of thermal infrared imager and visible light camera and use method of double-target calibration device
  • Double-target calibration device of thermal infrared imager and visible light camera and use method of double-target calibration device

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Embodiment 1

[0034] Such as figure 1 , 3 As shown, it includes: a calibration board 1 , N heating elements 4 , a controller (not shown in the figure) and a heat shield 2 arranged behind the calibration board 1 . N first through holes 6 arranged in a rectangular array are formed on the calibration plate 1 . The diameter of the first through holes 6 is 0.5-5 mm. The diameter of the first through holes 6 should be as small as possible to improve the calibration accuracy. A grid is drawn on the front surface of the calibration plate 1, the intersection of the straight lines in the grid is the first through hole 6, that is, the intersection coincides with the first through hole 6, and there is a heating element 4 in each first through hole 6 .

[0035] The lattices in the grid are filled with black and white, and the black lattices and white lattices are set at intervals. The heating element 4 is heated by electric heating, and the controller is electrically connected to N heating elements 4...

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Abstract

The invention discloses a dual-target calibration device of a thermal infrared imager and a visible light camera and a use method of the dual-target calibration device, the dual-target calibration device comprises a calibration plate and N heating bodies, N first through holes arranged in a rectangular array are formed in the calibration plate, a grid is arranged on the front surface of the calibration plate, the intersection points of the straight lines in the grid are the first through holes, and one heating body is arranged in each first through hole. Intersection points of the calibration plate are completely overlapped with temperature feature points, binocular joint parameter calibration of the thermal infrared imager and the visible light camera is achieved, and a basis is established for three-dimensional reconstruction and image fusion of the multispectral camera; compared with two-dimensional calibration template calibration based on a circular hole calibration plate as a feature, the device has the advantages that the principle error of circle center extraction is eliminated; the device is simple in structure, reasonable in design, easy to implement, wide in application range and easy to popularize and implement, can calibrate the visible light camera and the thermal infrared imager at the same time, and has good economic benefits.

Description

technical field [0001] The invention belongs to the technical field of camera calibration, and in particular relates to a dual-target calibration device for an infrared thermal imager and a visible light camera and a method for using the same. Background technique [0002] Multispectral is to use different spectral segments to obtain the same target image, and to obtain the physical characteristics of the target through the combination of different spectral segment images. In the field of space photogrammetry, multispectral cameras play an irreplaceable role. For example, a multispectral camera consisting of a visible light camera and an infrared thermal imager can simultaneously acquire visible light images and temperature images of a target. [0003] Before using the multi-spectral camera to accurately locate the target, the geometric parameters of the multi-spectral camera must be accurately calibrated in the laboratory. Most of the existing calibration methods are only...

Claims

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Application Information

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IPC IPC(8): G06T7/80
CPCG06T7/85G06T2207/10048G06T2207/20061
Inventor 周海波李晨铭王硕刘振忠陈胜勇杨守瑞沈创芸刘彪孙国庆
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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