Error analysis method for detecting atmospheric visibility by digital camera
A technology of atmospheric visibility and error analysis, applied in meteorological and electronic fields, can solve the problems affecting the detection accuracy and not considering the imaging performance of digital cameras, etc., and achieve the effect of high-precision visibility detection
Pending Publication Date: 2021-11-02
NANJING UNIV OF INFORMATION SCI & TECH
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The conventional practice does not consider the imaging performance of the digital camera itself, which affects the detection accuracy. At present, there is no such way to consider the influence of errors
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[0047] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0048] A kind of error analysis method of digital camera detecting atmospheric visibility described in the present invention, such as figure 1 shown, including:
[0049] Step 1. Select a digital camera, and obtain a brightness gain error and a brightness zero point error according to the brightness accuracy of the camera and the system dynamic range; a column and a slide rail are arranged under the camera, or a vehicle-mounted or airborne camera is used.
[0050] This embodiment selects Konica Minolta's Imaging colorimeter / photometer, the performance parameters of the camera are shown in the table below, the gain error corresponding to the brightness in the system accuracy is σ=±3%, and the dynamic range (61.4dB, means that the image contains from "darkest" to to the "brightest" difference) corresponding to the zero drift e...
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The invention discloses an error analysis method for detecting atmospheric visibility by a digital camera. According to the method, a brightness gain error and a brightness zero point error are obtained according to the brightness accuracy of a camera and the dynamic range of a system, and the distance between the camera and a target board, the sky background brightness and the theoretical visibility value are set, and are substituted into a visibility measurement model to calculate and obtain a target brightness theoretical value; a visibility relative error caused by a target brightness gain error and a visibility relative error caused by a target brightness zero error are respectively calculated through the brightness gain error and the brightness zero error of the camera; and the visibility relative error caused by the sky background brightness gain error and the visibility relative error caused by the sky background brightness zero point error are synthesized into the total relative error of the atmospheric visibility. According to the method, atmospheric visibility errors caused by different camera performances can be calculated and analyzed, and guidance is provided for selecting digital cameras for high-precision atmospheric visibility detection by using a digital camera shooting method.
Description
technical field [0001] The invention belongs to the field of meteorology and electronics, in particular to an error analysis method suitable for selecting a camera when detecting atmospheric visibility with high precision. Background technique [0002] Atmospheric visibility is an important weather and meteorological observation element, which seriously restricts aviation, navigation, road traffic and military activities. At present, the commonly used atmospheric visibility measurement instruments are mainly detectors based on scattering and transmission technology systems. With the rapid development of imaging and data processing technologies, the digital camera method is also widely used in visibility monitoring research due to its advantages of low cost, simple operation, and low site requirements. The existing digital camera monitoring visibility technology often uses ordinary digital cameras for image acquisition. Different camera performance directly affects the final...
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IPC IPC(8): G01N21/85
CPCG01N21/85G01N2021/8578G01N2201/12
Inventor 王敏周树道王康庄志豪
Owner NANJING UNIV OF INFORMATION SCI & TECH