A Water-Level Measurement Method Using Sparse Representation
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Water-Level Measurement Method Using Sparse Representation Shuqiang Guoa, *, Yaoyao Zhanga, and Yu Liua a
Department of Information Engineering, Northeast Electric Power University, Jilin City, Jilin Province, 132012 P. R. China *e-mail: [email protected]
Received September 2, 2019; revised November 28, 2019; accepted December 3, 2019
Abstract—The water level measurement method based on image processing has entered a stage of rapid development in recent years due to its visibility and confirmability. However, the water level measurement method based on image processing is very susceptible to water stains, residual water level line, lighting conditions and other factors, and the measurement accuracy is difficult to compare with the traditional water level measurement method. This paper proposes a water level measurement method based on image processing and sparse representation. The experiment indicated that the method has a strong robustness to light variation, local disability, foreign matter occlusion, and so forth. Further, the maximum error of the method is less than 0.9 cm, which is significantly smaller than other image processing based water level recognition methods such as frame difference method, image segmentation method and Hough transform. Keywords: sparse presentation, water level recognition, analyze error, water scale image DOI: 10.3103/S0146411620040069
1. INTRODUCTION Traditional water level measurement methods predominantly include manual reading of water gauges and using water level sensors [1, 2]. Among of them, manual reading is labor consuming, has low real-time performance, and creates uncertainty in terms of safety for people reading the water level in unfavorable environments. Using water level sensors can be divided into three kinds according to its method of inducting water level: float type water level meter, pressure type water level meter, and ultrasonic water level meter. The float type water level meter has high requirements for water quality, which tends to generate a fake water level and large errors when there are high amounts of silt or other impurities in the currents [3]. The pressure type water level gauge uses a pressure probe to generate different pressures at different water depths, and produces a corresponding current, thereby measuring the level of the water level [4]. Its response way has the disadvantages of being prone to external environmental temperature changes, having high costs, and showing difficulty in promotion. The final type is categorized as the gas medium or liquid medium ultrasonic wave water level meter [5]. The pneumatic or liquid-based ultrasonic water level gauge uses ultrasonic waves to propagate in the air. When it encounters an object, it will reflect at the interface and some of the sound energy will be reflected to the sound source. By measuring the time, the water level value is obtained according to the sound wave propagation distance. Range ability of this method is narrow and greatly affected by the environment [6]. At present, as for
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