基于计算成像的端到端延展景深衍射元件的设计  

Design of End-to-End Depth-of-Field Extension Diffractive Optical Elements Based on Computational Imaging

作　　者：吉佳瑞 谢洪波[1] 杨磊[1] Ji Jiarui;Xie Hongbo;Yang Lei(Key Laboratory of Optoelectronics Information Technology,Ministry of Education,College of Precision Instrument and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室,天津300072

出　　处：《光学学报》2024年第2期144-152,共9页Acta Optica Sinica

摘　　要：提出一种基于计算成像理论的端到端衍射元件设计方法,通过全局性优化方案将光学设计和图像复原作为整体,从而降低前端光学系统的成像质量要求,并利用图像复原算法去除残余像差以简化系统。所提设计方法涵盖光场传播、探测器去噪和图像后处理等关键环节的模型建立与联合优化。该设计方案可用于景深延展的轻薄型衍射元件的设计,且所适用的大景深的简单光学系统具有较高的成像质量。Objective This study aims to develop compact and lightweight imaging optical structures,transcending the challenges posed by intricate architectures,specialized materials,and unique surface configurations prevalent in traditional optical design paradigms.In response to these challenges,we introduce computational imaging techniques,seamlessly integrating the realms of optical design and image restoration.This integration alleviates the intricacies associated with front-end optical system design while concurrently streamlining the process through the application of image restoration algorithms.By transposing the complexities of optical design into the algorithmic realm,we endeavor to reduce optical system complexity while preserving image quality.Methods We propose an end-to-end(E2E)framework to facilitate the creation of the diffractive optical element(DOE)capable of extending the depth of field(DOF).This framework integrates point spread function(PSF)design,imaging models,and deep image restoration networks through the utilization of modern deep learning tools.As a significant departure from traditional practices,this framework eradicates the traditional segregation between front-end optical design and back-end image processing stages.This method uses image quality as the final evaluation criterion to find the optimal balance between the consistency of a given DOF range and PSF.Moreover,the holistic E2E approach introduced by this method encompasses the intricate task of designing lenses(or lens groups)to accomplish the focus function.This strategic integration effectively simplifies the design complexities intrinsic to DOE,steering the design focus exclusively toward extending the DOF.Specifically,we employ the phase coefficients of cubic phase plates and the one-dimensional height map of rotationally symmetric DOEs to facilitate the dimension reduction of optical design parameters.Network constraints encompass the L1 constraint as the loss function for the image,alongside the inclusion of PSF consistency at var

关 键 词：成像系统 端到端 景深延展 图像复原 衍射元件 

分 类 号：O436[机械工程—光学工程]