Near-infrared camera calibration device under specific wave band, calibration point extraction method and calibration point extraction system
A calibration device and near-infrared technology, used in image data processing, instruments, calculations, etc., can solve the problems of uneven heating, reduce the calibration accuracy of the near-infrared calibration plate, and achieve uniform images, small temperature changes, and stable images.
Active Publication Date: 2019-05-14
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology
Due to uneven heating and thermal expansion of the calibration plate, etc., the calibration accuracy of the near-infrared calibration plate will be reduced
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[0065] In order to describe the technical solution provided by the present invention more clearly, the following is illustrated with specific examples, and the specific examples are as follows:
[0066] The imaging of the camera in a specific band can greatly reduce the influence of environmental noise on the measurement results, and further reduce the complexity of feature extraction, so it is widely used in the field of visual measurement. For visible light cameras, within its photosensitive range, in order to eliminate the influence of other bands, filters of specific bands can be selected. Take the calibration of 850nm near-infrared camera as an example:
[0067] Select the appropriate halcon transparent calibration plate, and fix it through the screwed cover plate;
[0068] Turn on the main switch of the power supply, the near-infrared light source and the cooling device work, and the preheating device;
[0069] Fix the visible light camera, install 850nm bandpass filte...
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The invention discloses a near-infrared camera calibration device under a specific wave band. The near-infrared camera calibration device comprises a halcon calibration plate, a near-infrared light source device, a heat dissipation device, a circular-truncated-cone-shaped sleeve and a cover plate. The approaching infrared light source device and the halcon calibration plate are connected through the circular truncated cone-shaped sleeve. The halcon calibration plate is fixed at one end of the circular-truncated-cone-shaped sleeve through a cover plate in threaded connection with the circular-truncated-cone-shaped sleeve. And the heat dissipation device is connected with the near-infrared light source device. The calibration device provided by the invention realizes uniform and stable images for a long time, and is high in manufacturing precision, small in temperature change, clear in texture feature and easy to extract. The invention further discloses a near-infrared camera calibrationpoint extraction method and system under the specific wave band.
Description
technical field [0001] The present application relates to the technical field of camera calibration, and in particular to a near-infrared camera calibration device, calibration point extraction method and system in a specific wavelength band. Background technique [0002] The near-infrared camera does not image in the visible light band (400-760nm), but is more sensitive to the near-infrared band (780-2526mm). With the maturity of related technologies and the reduction of cost, it has been widely used in military, medical and engineering fields. [0003] Infrared cameras are mostly used to obtain the temperature and general outline of objects, and there are few studies on visual measurement. Because it cannot obtain the texture structure of the visible cursor calibration plate, high-precision calibration under infrared has always been one of the main problems limiting its application. [0004] At present, it can be mainly classified into the following three categories of in...
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Login to View More IPC IPC(8): G06T7/80G06T7/136G06T7/13G06T5/00
Inventor 顾永刚毕松林翟超龚明
Owner UNIV OF SCI & TECH OF CHINA