Study On A Mirage-like Phenomenon Based On Three-dimensional Information Acquisition Platform Of Fish Target

Water pollution is a serious problem in the world.To solve the problem,the first step is to monitor the water quality to determine the pollution situation.Many scholars have proposed a variety of water quality monitoring methods.The biological monitoring method of fish stocks is the recent most popular and useful method for its good real-time,high sensitivity and good comprehensive effect.This method uses fish for water quality monitoring and its key point is fish behavior tracking and positioning.The monocular three-dimensional information acquisition platform for fish target in this paper is a systematic platform for monitoring water quality by using fish behavior.In this platform,there is a strange optical phenomenon,which is called "mirage-like phenomenon".This phenomenon is a limit state of mirage and has a great impact on the acquisition of fish behavior information,so the study of this phenomenon is necessary.In this paper,according to the principle of geometrical optics,the causes of the mirage-like phenomenon were explained,and its mathematical model was established.By analyzing the characteristics of the phenomenon,the algorithm to eliminate its influence was designed,and the three-dimensional coordinate positioning algorithm was optimized to improve the accuracy and robustness.The main works and achievements of this paper are as follows:1.Constructed a mathematical model of "mirage-like phenomenon".Based on geometrical optics,the imaging principle,the refraction and reflection principle,the causes of the mirage-like phenomenon were analyzed,and the mathematical model was established to derive the area of mirage-like phenomenon.Experiments showed the correctness of mirage-like phenomenon area and mathematical models.2.The algorithm of eliminating the influence of "mirage-like phenomenon" was put forward.According to the characteristics and experimental situation of this phenomenon,the algorithm of eliminating was designed by using image processing technology and moving target detection and tracking technology,which eliminated the adverse effect of the mirage-like phenomenon on the three-dimensional information acquisition platform of fish target.Experiments showed that the algorithm can effectively eliminate the interference.3.The old three-dimensional coordinate positioning algorithm of fish target was optimized.In this paper,a new algorithm was proposed to solve the problem of three-dimensional coordinate calculation,which improved the accuracy of the old algorithm and enhanced the robustness.Experiments showed that the new algorithm has a good three-dimensional positioning effect.