Research On Imaging System And Servo Control Of Focal Length Of Bionic Eye

Visual information obtain has been widely used in the areas of modern engineering technology. The focal length control of bionic human eye imaging system is one of the most important research directions of machine vision. In this paper, we put forward a bionic human eye imaging focus servo control mechanism model which based on human characteristics. This paper also analyzing the structure principle and the mathematical mode of bionic human eye imaging system. Lastly the paper put forward the servo control strategy theory and research on the modeling, simulation and experimental analysis. Specific studies include the following aspects:Firstly, the research background and significance of this topic research are introduced. Both the present development situation and elaborate the main characteristics of the bionic machine vision are investigated broadly. Then it listed the important research problems and put forward the main research content of this article.Secondly, the paper analyzed the generalized human visual zoom mechanism and characteristics Then the bionic eye electromechanical system model and the imaging system model structure are established according to the principle of bionics design which include the driving element simulating the ciliary muscle, visual sensor and position detection sensors. The structure dimension parameters of this system are designed which based on the human eyes’size and the mechanical processing technology.Thirdly, the system model which combine with the application object adopted the method of theoretical analysis are derived in this paper. Then the mathematical model and the transfer function of the bionic human eye imaging focal length servo control system are established. In addition, it analyzed the dynamic characteristics of system and designed the drive mode and current inner loop control mode.Fourthly, the traditional control algorithm and sliding mode control algorithm are introduced in this article and the control method to simulate analysis based on the mathematical model are designed. Then it designed the fuzzy sliding mode control method based on the nonlinear feature of the system load and friction by combining with fuzzy control and sliding mode control. Contrasting result and the simulation illustrates the fuzzy sliding mode control method can achieve the goal of location tracking and has a good control performance.Finally, this paper developed a focus servo control system by using the digital signal processor (TMS320F2808) based on the research of the mathematical model of the system. The experiment platform of bionic human eye imaging focal length control are established and the hardware and software design are explored. Through analyzing the results of the experiment, obtained the relationship of input signal and the displacement.