In flight MTF monitoring and compensation for CCD camera on CBERS-02

All image systems cause a blurring of the scene radiance field during image acquisi- tion. Accurate characterization of this blurring is referred to as the modulation transfer function (MTF)[1]. The MTF is a fundamental imaging system design specification and system quality metric often used in remote sensing. It results from the cumulative effects of the instrumental optics (diffraction, aberrations, focusing error), integration on a pho- tosensitive surface, charge diffusion along the arra…     

多谱段标准镜头光学系统设计及装校

本文设计了一款检测用的多谱段标准镜头,其焦距为180mm、相对孔径D F=13、视场角2ω=6°。该镜头具有波段（400-1000nm）跨度比较宽的特点,并且对每个特定波长的传递函数值都有严格的要求,即在80 lp/mm时均达到0.5以上,且畸变小于2%。设计时运用光学设计软件ZEMAX的多重结构功能,保证了每个特定的波长传递函数都能达到要求。在装校镜头时通过定心仪精调每组镜片与镜筒的同轴度。经过精细的设计及有效的装校,最终产品测试结果表明轴上星点达到非常良好的效果,传递函数全部满足设计要求。     

Evaluation of moving‐line contrast degradation without motion

Abstract— A method for evaluation of the contrast of moving step‐grating patterns under smooth‐pursuit eye‐tracking conditions without imaging data acquisition and image analysis is introduced. Periodic optical responses of the display to a set of simple driving signals have been recorded at a fixed location, and the luminance vs. time data has been evaluated to obtain two types of contrast for characterization of the dynamical performance of the display under test: the frame‐convoluted contrast and the frame‐integrated contrast. The relation of this characterization with respect to modulation transfer functions from impulse responses and to the dynamic modulation transfer function from sine‐gratings is explained and discussed. The approach described here provides a detailed and comprehensive characterization of the dynamical properties of electronic displays including both extreme cases of step‐response and impulse‐response with quantities that are related to visual perception. With this type of evaluation, the visual resolution of displays can be described by the same characteristics in the static and the dynamic case. The method is attractive due to limited instrumental efforts and the transparent method of evaluation.     

联合变换相关器傅里叶变换镜头光学系统设计

针对联合变换相关器的目标识别的设计要求,为提高联合变换相关器光学特性,本文提出三片式傅里叶变换透镜的设计。该设计根据电寻址液晶EALcD和CCD对傅里叶变换透镜的匹配要求确定设计参数。工作波长为O．6328,um,焦距200mm,全视场角4°,相对孔径1：4。系统引入偶次非球面,使镜头结构紧凑、重量轻、筒长短。设计结果表明：在空间频率501p／mm时,光学系统的MTF大于0．8,接近衍射极限,像质优良,满足联合变换相关器的总体设计要求。     

TDI-CCD相机动态成像的速度同步控制研究

在介绍时间延迟积分电荷耦合器件(TD I-CCD)的结构与工作原理基础上,通过像移调制传递函数(MTF)分析了TD I-CCD行扫速率与运动像不同步时对相机成像质量的影响。理论和实验仿真表明:在奈奎斯特频率范围内,只要将TD I-CCD推扫成像过程中的同步误差控制在一定的范围内,就可以明显地减少像移对成像质量的影响,最后,给出了2种简便和实用的同步控制方法。     

Development of the PenTile Matrix™ color AMLCD subpixel architecture and rendering algorithms

Abstract— Color subpixel rendering is enhanced by co‐optimizing the color subpixel architecture and algorithms with respect to human vision. This has resulted in the PenTile? display technology, which provides double the information content per subpixel when compared to a conventional RGB Stripe display. Output performance results from mathematical modeling, software simulations, and prototype AMLCDs displays demonstrate significant quality improvements to both text and full‐color images in comparison to images from RGB Stripe displays that have the same number of subpixels and column drivers.     

光学稀疏孔径成像复合孔径阵列结构研究

对环型、Y型和Golay6等典型的光学稀疏孔径成像系统,给出了最大和最小填充因子,结果表明,最大填充因子只与子孔径的数目有关.提出一种建立在典型光学稀疏孔径阵型基础上的复合孔径阵列结构,给出了3种不同复合孔径阵列结构形式,在填充因子相同的情况下,用计算机仿真子孔径间距变化、子阵列旋转对调制传递函数(MTF)的影响,并对系统模拟成像及噪后的图像进行重构,使用相关系数对图像质量进行评价.结果表明,这种复合孔径阵列结构通过复制子阵列能够扩大系统的口径,而且具有易于加工、装调方便的特点.     

写光波长对光折变空间光调制器分辨率的影响

结合光学实验及数值模拟,对写光波长的变化对基于Bi12SiO20(BSO)光折变晶体的光寻址空间光调制器(SLM)的调制传递函数(MTF)空间频率响应的影响进行了分析.光学实验分析结果和数值模拟分析相吻合,写光波长以及电荷位置对SLM的MTF空间频率响应的影响在本质上得到了统一.根据分析及讨论,较短波长的写光有利于获得较好的MTF空间频率响应.     

红外焦平面热成像仪参数测试系统

本文分析了热像仪参数测试仪的基本结构,介绍了热像仪参数测试仪的发展现况及主要公司的产品,并重点对热像仪主要参数的测量方法进行了调研,最后提出了一套热像仪参数测试仪的设计方案。     

拍照手机镜头MTF的测量方法

镜头调制传递函数(MTF)的测量有正投影和逆投影两种方法。拍照手机镜头由于体积小、后焦短、所配感光器的像素越来越高,正投影法测量用的CMOS/CCD受其保护玻璃厚度和自身像素的制约而有局限性;逆投影法颠倒镜头成像系统物和像的位置,克服了手机镜头后焦、像素等的限制。实验结果证明逆投影法能快速测量拍照手机镜头的MTF,方便评定镜头的品质,有较大的实用价值。