利用光轴可移动液晶透镜的立体图像采集系统  

Stereo Image Acquisition System Using Optical Axis Movable Liquid Crystal Lens

作　　者：万超杰 刘志强 徐律涵 李慧海 叶茂 Wan Chaojie;Liu Zhiqiang;Xu Lühan;Li Huihai;Ye Mao(School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,Sichuan,China;Sichuan Tianwei Electronics Co.,Ltd.,Chengdu 610200,Sichuan,China)

机构地区：[1]电子科技大学光电科学与工程学院,四川成都611731 [2]四川天微电子股份有限公司,四川成都610200

出　　处：《光学学报》2023年第3期60-67,共8页Acta Optica Sinica

基　　金：四川省科技计划(2021YJ0102)。

摘　　要：针对传统双目视觉系统体积大、成本高等缺点,提出了一种利用光轴可移动液晶透镜的单相机立体图像采集系统。该系统由一个固定的相机模块和一个贴有偏振片的液晶透镜构成。通过改变电压的方式移动光轴并采集图像,利用光流法获取图像视差。研究了液晶透镜光轴变化对系统整体光轴的影响,推导了视差与深度的关系。通过验证所采集的图像存在视差来说明所设计系统的可行性,并进行了近距离物体的深度获取。实验结果表明,利用液晶透镜的光轴移动功能可以使系统的整体光轴产生移动,实现立体视觉。所设计系统无需机械移动,具有结构简单紧凑和成本低廉的优点,为立体图像的采集提供了新的方法。Objective Stereo images are usually acquired by changing the position of a single camera in the scene or by using two or even more cameras fixed at the same platform.Multicamera systems are large and costly,and due to slight differences between each camera in terms of focal length,zoom level,camera gain,and so on,there are inevitable intensity differences between the matching points of the stereo images.Researchers have adopted methods combining a single camera and several optics devices to achieve stereo vision,so as to avoid this problem.The core function of the optics devices is to develop a single camera system with different imaging views.Various optical components have been reported in studies,for example,by rotating a flat glass plate or some plane mirrors placed in front of a single camera,or using a single camera pointing at a biprism or some multiple parabolic mirrors.However,optics rotation systems need to address the accuracy of mechanical movement,and biprism systems need to solve the problem of how to get the same image size.Parabolic mirror systems using multiple curvatures involve complex mirroring mechanisms,and the mirrors with multiple curvatures make the system difficult to be compact.Therefore,it is of research value and significance to seek more direct methods to realize a singlecamera stereo vision system with a simpler and more compact structure.In this study,a singlecamera stereo image acquisition system using an optical axis movable liquid crystal lens is presented.The optical axis position of the liquid crystal lens can be controlled by adjusting the voltage,and thus the stereo vision in a single camera can be achieved.Although it is consistent with the purpose of multiview imaging through rotation,mirror reflection,biprism,etc.,the mechanism of the designed system is simple.It allows the system to be used without mechanical movement during image acquisition,so as to reduce the complexity of the system.The liquid crystal lens is thin and light,and fits closely to the camera lens,which m

关 键 词：成像系统 液晶透镜 光轴移动 图像采集 深度获取 

分 类 号：TN141.9[电子电信—物理电子学]