Research On Biomimetic Optical System And Visual Attention Mechanism

With the development of the engineering technology,visual imaging and information processing system have got widely applied in daily life.The human eye has delicate optical structure and visual information perception mechanism after the long-term evolution,which offers inspiration and solution for the study of biomimetic vision system.In this thesis,we systematically analyze the optical structure,imaging mechanism and visual attention process of the human eye,propose a novel methodology for the bionic optical system design and modeling of the visual attention mechanism,develop a bionic solid-liquid mixed tunable lens with multilayered structure using the elastic polymer material,bio-inspired zoom system and a bionic tunable intraocular lens,and present a new visual attention model based on double channel and multi-feature integration,accomplish the related simulation and experiment analyses,which are of significant importance for the development of the optical design,ophthalmology and image processing technology,the main contents of this thesis are as follows:In chapter 1,the related study background and significance are introduced,and the current situation and major theoretical approach of the bionic zooming system,artificial intraocular and visual attention model are elaborated.Besides,we also analyze the main problems facing the research on bionic optical system and vision mechanism,and present the main content of this thesis.In chapter 2,the key problems during the design and fabrication process of the tunable optical lens have got studied.The structure properties of solid-liquid mixed tunable lens using elastic polymer material are presented,as well as the lens fabrication procedure and regulating process.Firstly,we introduce the physiological characteristics and optical model of human eye,and propose the structure principle of solid-liquid mixed tunable lens according to the properties of the elastic polymer material.Secondly,the constitutive relation of the elastic polymer material is analyzed,and the manufacture method and fabrication process are proposed.Finally,we design an experiment platform for the tunable lens,test the deformation properties,imaging result and focusing process,and accomplish the lens simulation experiments and quantitative analyses.In chapter 3,the design and structure principles of a biomimetic optical imaging system are proposed.Firstly,the whole structure and focusing scheme of the bionic imaging system are presented,the design principle and realization method of the imaging system based on bionic tunable lens are proposed.Then,the key components of the system are designed and manufactured according to the structure characteristics of the system.Finally,we design an experiment platform for the control and test of the bionic optical imaging system,analyze the focusing range,imaging result and optical properties of the system,and obtain the imaging properties and focus regulation pattern.In chapter 4,we propose a novel zooming system based on the tunable polymer lens,and accomplish the regulating principle analyses and prototype design of the zooming system.As for the optimization problems of the zooming system based on tunable lens,we analyze the aberration theory of the system in detail,and obtain the aberration optimization method and general design principle.Furthermore,the zooming result,imaging quality and optical properties of the designed system are tested and analyzed.In chapter 5,in order to facilitate the solve of the visual lesion problems,we propose a bionic tunable artificial intraocular lens.Firstly,the physiological structure and regulating mechanism of the intraocular lens are introduced,as well as the lens optical models.Then,the design principle,optical structure,and fabrication method of the intraocular lens are presented.Finally,we develop a testing platform for the bionic tunable artificial intraocular lens,and analyze the lens regulating capacity,imaging properties and surface roughness.In chapter 6,inspired by the visual perception process of the human eye,we propose a novel visual attention model based on double channels and multi-feature integration.Firstly,we construct the pre-attention channel utilizing the multi-scale contrast and location features.Secondly,the back-attention channel is constructed through the integration of several primary visual features.Finally,the whole saliency map is obtained through weighted integrated mechanism.The basic principle,saliency evaluation method,and feature integration theory have got studied,and the comparison experiment and analyses of the proposed model have got accomplished.In chapter 7,the major work of this thesis is summarized,the main conclusion and innovative points are presented,as well as the future development and discussions.