Unmanned-aerial-vehicle-mounted double-target-plate visibility detection method

Abstract

The invention discloses an unmanned-aerial-vehicle-mounted double-target-plate visibility detection method. The method comprises the steps: forming an unmanned-aerial-vehicle-mounted image collectionunit through employing an unmanned-aerial-vehicle-mounted digital camera, and forming unmanned-aerial-vehicle-mounted target plate units through employing unmanned-aerial-vehicle-mounted target plates; enabling an unmanned-aerial-vehicle-mounted image acquisition unit and the two unmanned-aerial-vehicle-mounted target plate units to fly at the same height in the air, capturing images of the two target plates in real time by using a digital camera, calculating average gray values of black and white parts on each target plate on the images, and substitutes the average gray values into a visibility measurement model to obtain an atmospheric horizontal visibility value at the vertical height. According to the method, a problem that a target originally fixed on a foundation is influenced by obstacles and background sky brightness as well as a problem that the measured value of an existing instrument cannot represent the local actual condition when the atmospheric visibility is uneven can besolved; and high-precision real-time measurement can be performed on visibility weather with different vertical heights, different horizontal orientations and dynamic changes by utilizing the maneuvering flexibility and the hovering operation mode of the unmanned aerial vehicle.

Description

technical field [0001] The invention belongs to the fields of meteorology and electronics, and in particular relates to a visibility detection method suitable for a dual-target board carried by an aerial unmanned aerial vehicle. 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. However, most of the existing digital video monitoring visibility technologies are based on the brightness contrast method to capture images of a single target and the b...

AI Technical Summary

Problems solved by technology

In this measurement method, the interference of background objects is serious and the scope of application is narrow. The uneven distribution of clouds in the sky, reflections on the ground, and reflectors in the direction of the camera's line of sight will all affect the accurate extraction of sky background brightness, and then affect the detection accuracy of visibility. Therefore, it is necessary to study the visibility detection method that can improve the measurement accuracy of the background sky brightness, or propose a new visibility detection method that is not affected by the sky background brightness, in order to improve the accuracy of the digital camera method for visibility detection

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