CAJ | 학술논문

在确定激光器的发散角度、脉冲峰值功率、接收光学系统的参数以及确定激光器和接收光学系统的几何配置后,激光主动成像系统要想得到更远距离更高分辨率的微弱目标的图像,就只受微弱目标的探测成像及处理技术的制约,因为在较长的距离和有限的激光能量下,不可能立刻照明整个目标场景,接收成像端CCD上每个像素接收到的光照度也不可能达到相当的水平.为了在特定的脉冲激光能量下增加成像系统的成像距离,同时减轻大气扰动对成像分辨率的影响,研究了一种独特的图像处理算法,用激光多脉冲来获取整个目标场景的图像,采用辐射量来确定每次曝光时间内最大景物照明区域,这种独特的多帧后处理算法,可以在大气扰动和连续散粒噪声影响下,得到比传统连续照明方式更高分辨率的图像.
재학정격광기적발산각도、맥충봉치공솔、접수광학계통적삼수이급학정격광기화접수광학계통적궤하배치후,격광주동성상계통요상득도경원거리경고분변솔적미약목표적도상,취지수미약목표적탐측성상급처리기술적제약,인위재교장적거리화유한적격광능량하,불가능립각조명정개목표장경,접수성상단CCD상매개상소접수도적광조도야불가능체도상당적수평.위료재특정적맥충격광능량하증가성상계통적성상거리,동시감경대기우동대성상분변솔적영향,연구료일충독특적도상처리산법,용격광다맥충래획취정개목표장경적도상,채용복사량래학정매차폭광시간내최대경물조명구역,저충독특적다정후처리산법,가이재대기우동화련속산립조성영향하,득도비전통련속조명방식경고분변솔적도상.
After fixing on the divergent angle,peak power of laser pulse,parameters of received optical system and the geometrical configuration betweeh laser and received optical system, a faint target image of longer range with higher resolution obtained by active imaging system is constrained by imaging and processing technologies. With longer range and limited laser energy, it is impossible to illuminate the entire scene at once, and the illuminance obtained by each receiver pixel of CCD can not achieve an adequate level. In order to increase the imaging range of imaging system with given per-pulse laser en ergy, and to reduce atmospheric turbulence effects on image resolution, multi pulses may be employed to obtain image data over the whole scene and radiometric conceptions are used to establish the maximum scene illumination region during each exposure. A unique multiframe postprocessing technique is investigated in this paper. It is shown that in the presence of atmospheric turbulence and coherent speckle effects, this approach can produce superior results to conventional scene flood illumination.