CAJ | 학술논문

高动态范围的图像可用于同时探测具有较大对比度的亮暗目标，利用数字微镜（ DMD）获取高动态范围图像是目前最为先进的一种技术。本文在分析DMD工作原理的基础上，设计了一种像素级的高动态范围图像获取系统，该系统由光学系统、机械系统、DMD像素级调光算法及成像单元组成。光学系统采用二次成像光路，其中第一次成像物镜采用像方远心光路，第二次成像的转置镜头采用放大倍率近似1∶1的准对称结构，机械系统采用光学元件的包边设计和定心车工艺，达到秒级的光学装配精度；DMD像素级调光算法采用搜索单个微镜像素在图像帧周期间的控制权值实现，成像单元可同时兼顾科学级12 bit sCMOS和8 bit CCD，设计完成的原理样机验证了系统设计的正确性，其获取的图像动态范围可达140 dB以上，远高于传统摄像机78 dB的动态范围。
고동태범위적도상가용우동시탐측구유교대대비도적량암목표，이용수자미경（ DMD）획취고동태범위도상시목전최위선진적일충기술。본문재분석DMD공작원리적기출상，설계료일충상소급적고동태범위도상획취계통，해계통유광학계통、궤계계통、DMD상소급조광산법급성상단원조성。광학계통채용이차성상광로，기중제일차성상물경채용상방원심광로，제이차성상적전치경두채용방대배솔근사1∶1적준대칭결구，궤계계통채용광학원건적포변설계화정심차공예，체도초급적광학장배정도；DMD상소급조광산법채용수색단개미경상소재도상정주기간적공제권치실현，성상단원가동시겸고과학급12 bit sCMOS화8 bit CCD，설계완성적원리양궤험증료계통설계적정학성，기획취적도상동태범위가체140 dB이상，원고우전통섭상궤78 dB적동태범위。
In some scenarios , very bright objectives and very dark objectives exist at the same time .The tradi-tional imaging device can not detect these objectives , and then high dynamic range image acquiring system is needed to detect them.Digital Micro-mirror Devices(DMD) is used to get high dynamic range image , which is the most advanced technology at present .In this paper , a pixel level high dynamic range imaging system is designed based on DMD .The system is composed of optical system , mechanical system , DMD pixel level dim-ming algorithm and imaging unit .The secondary imaging system is used in the optical system .The first ima-ging optical structure is image space telecentric system , and the second imaging optical structure is magnifica-tion 1:1 quasi-symmetric system .Wrapping technology of optical elements and centering machining process are used in mechanical system , and the optical assembly precision reaches second level .The method searching for single DMD pixel's controlling weight is used in dimming algorithm .The science class 12 bit sCMOS and 8 bit CCD can be used simultaneously in imaging unit .The correctness of the system is proved by the prototype . The image dynamic range can reach 140 dB, much higher than 78 dB dynamic range of traditional cameras .