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利用异形像元探测器提高空间分辨率

Enhancing spatial-resolution with detectors of special-shaped pixels

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摘要

为了解决光电系统成像中探测器分辨率低的问题,针对造成探测器分辨率低的两大主要因素—采样率不足及感光区域的低通滤波效应,提出一种基于异形像元探测器的超分辨成像方法。综合现有的超分辨重建技术和减少像元尺寸方法的优缺点,将现有的探测器矩形像元逐一"变形",去除同一位置1/4象限;利用该异形像元探测器阵列获取一序列相互错位1/2像元的欠采样图像;最后利用图像算法计算出这些图像的灰度矩阵信息,重建最终的高分辨图像。该方法可同时提高探测器的采样频率和截止频率,拓展带宽,从而实现高分辨率成像。为了验证该方法的有效性,在试验中选取填充因子100%的46 μm×46 μm中波红外探测器,利用焦距为6 000 mm、口径为600 mm的红外平行光管和焦距为50 mm的中波红外镜头成像,如果不采用任何技术,物方分辨率为11.04 mm;过采样技术可将分辨率提高1.60倍,物方分辨率为6.9 mm;而采用异形像元探测器超分辨成像方法,在试验中将每个像元都抠掉23 μm×23 μm后, 物方分辨率为3.1 mm。

Abstract

For the overwhelming majority of E-O imaging systems, spatial resolution is strictly limited by the detector. This paper studies the main reasons for the influence of the detector on resolution and proposes an imaging method based on special-shaped detectors to enhance the resolution. It is implemented by two detector-arrays of special-shaped pixel where each pixel is reduced by 25% in size. The multiple mis-registered frames are used to solve the grayscale matrix and reconstruct the super-resolution image in the post-detection processing. It presents a theoretical assessment that if a small part of the active area of each pixel is deducted, the frequency-response distribution of the complement will be equal to that of the deducted part independent of the amplitude. To demonstrate the arrangement, a MWIR experiment is undertaken,then two 46 μm×46 μm linear arrays with a 100% full factor are chosen initially and a quarter each pixel is removed. The result demonstrates that the bar-contrast interval is discriminated in an objective space by up to 3.1 mm using an optical system composed of a 6 000 mm f/10 collimator and a 50 mm IR lens. By contrast, it is equivalent to an 11.04 mm with conventional imaging method and 6.9 mm through oversampling technology. The study verifies that the most visually pleasing image or some specific information can be captured by system-matching from optics to electronics for better processing, and including some pre-detection and post-detection processing.

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中图分类号:TN215;TP391

所属栏目:争鸣专栏

基金项目:中国科学院知识创新工程资助项目(No.O69Y32J060)

收稿日期:2009-06-30

修改稿日期:2009-08-07

网络出版日期:0001-01-01

作者单位    点击查看

刘妍妍:中国科学院长春光学精密机械与物理研究所 光学系统先进制造技术 中国科学院重点实验室,吉林 长春 130033中国科学院 研究生院,北京 100039
张新:中国科学院长春光学精密机械与物理研究所 光学系统先进制造技术 中国科学院重点实验室,吉林 长春 130033
徐正平:中国科学院 研究生院,北京 100039中国科学院 长春光学精密机械与物理研究所,吉林 长春 130033
张建萍:中国科学院长春光学精密机械与物理研究所 光学系统先进制造技术 中国科学院重点实验室,吉林 长春 130033
王灵杰:中国科学院长春光学精密机械与物理研究所 光学系统先进制造技术 中国科学院重点实验室,吉林 长春 130033
王德江:中国科学院 长春光学精密机械与物理研究所,吉林 长春 130033

联系人作者:刘妍妍(liuyanyan_1982@126.com)

备注:刘妍妍(1982-),女,吉林长春人,博士研究生,主要从事提高成像系统分辨率技术方面的研究。

【1】HARRIS J L. Diffraction and resolving power [J].Journal of the Optical Society of America, 1964,54(7):931-936.

【2】GOODMAN J W. Introduction to Fourier Optics [M]. 2nd ed. New York: McGraw- Hill, 1996.

【3】TSAI R Y, HUANG T S. Multipleframe image restoration and registration[C]. Advances in Computer Vision and Image Processing. Greenwich, CY: JAI Press Inc., 1984:317-339.

【4】DRIGGERS R G, KRAPELS K, YOUNG S. The Meaning of Super-Resolution [C]. Proc. SPIE,2005,5784:103-105.

【5】KOMATSUT, AIZAWA K, IGARASHI T, et al.. Signal-processing based method for acquiring very high resolution image with multiple cameras and its theoretical analysis [C]. Proc. Inst. Elec. Eng., 1993,140(1):19-25.

【6】FRIEDENBERG A. Microscan in infrared staring systems [J]. Optical Engineering, 1997,36(7):1745-1749.

【7】王晓蕊,胡方明,张建奇,等. 基于微扫描的焦平面阵列成像特性研究[J]. 西安电子科技大学学报(自然科学版),2005,32(3):392-397.
WANG X R, HU F M, ZHANG J Q, et al.. Research on the FPA imaging character based on microscanning[J]. Journal of Xidian University, 2005,32(3):392-397. (in Chinese)

【8】FANNING J D, REYNOLDS J P. Target identification performance of superresolution versus dither[C]. Proc. SPIE, 2008,69410N,1-12.

【9】金伟其,陈翼男,王霞,等. 考虑探测器填充率及微扫描对位偏差的扫描型亚像元热成像算法[J]. 红外与毫米波学报, 2008,27(4):308-312.
JIN W Q, CHEN Y N, WANG X, et al.. Scanning type sub-pixel thermal imaging algorithm taking account of detector filling rate and micro-scanning contraposition bias[J]. J. Infrared Millim. Waves, 2008,27(4):308-312.(in Chinese)

【10】杨桦,郭悦,伏瑞敏.TDICCD的视场拼接[J].光学技术,2003,29(2):226-228.
YANG H, GUO Y, FU R M. Study on field butting of TDICCD[J]. Optical Technique,2003,29(2):226-228. (in Chinese)

【11】徐之海,冯华君.超高分辨率光电成像技术的研究进展[J].红外与激光工程,2006,35(4):456-463.
XU ZH H, FENG H J. Overview of research approaches for ultrahigh-resolution optoelectronic imaging[J]. Infrared and Laser Engineering, 2006,35(4):456-463.(in Chinese)

【12】朱家佳,汶德胜,乔卫东,等.一种TDICCD亚像元合成方法[J]. 光子学报, 2007,36(5):933-936.
ZHU J J, WEN D SH, QIAO W D, et al.. Method for composing two images of TDICCD sub-pixel camera [J]. Acta Optica Sinia, 2007,36(5):933-936.(in Chinese)

【13】张智,夏德深,孙权森.一种亚像元遥感图像的小波插值及滤波方法[J].南京理工大学学报(自然学科版), 2008,32(2):195-198.
ZHANG ZH, XIA D SH,SUN Q S. Wavelet tnterpolation and Filtering of subpixel remote sensing image[J]. Journal of Nanjing University of Science and Technology (Natural Science), 2008,32(2):195-198.(in Chinese)

【14】http://www.c-cnc.com/dz/news/news.asp?id=22091[OL].

【15】MAIT J N, ATHALE R, GRACHT J V D. Evolutionary paths in imaging and recent trends[J]. Optics Express, 2003,11(18):2093-2101.

【16】Gerald C. Holst. Electro-Optical Imaging System Performance [M]. 3rd ed. Bellingham Washington: SPIE Press, 2005: 83.

【17】GOODMAN J W. Introduction to Fourier Optics [M]. 2nd ed. New York: McGraw- Hill, 1996.

【18】郁道银,谈恒英.工程光学[M]. 2版.北京:机械工业出版社, 2006:198.
YU D Y,TAN H Y.Engineering Optics[M]. 2nd ed.Beijing:China Machine Press,2006:198.(in Chinese)

【19】VOLLMERHAUSEN R H, DRIGGERS R G. Analysis of Sampled Imaging Systems[M]. Bellingham, Washington: SPIE Process, 2000:34-36.

【20】HADAR O, BOREMAN G D. Oversampling requirements for pixilated-imager systems[J]. Optical Engineering, 1999,38(5):782-785.

【21】车双良,汶德胜. 亚像元动态成象系统空间分辨率研究[J].光子学报,2001,30(11):1418-1420.
CHE SH L, WEN D SH. The space resolution of dynamic subpixel imaging system[J]. Acta Photonica Sinica, 2001,30(11):1418-1420. (in Chinese)

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