基于远红外相机的被动式光场成像
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摘要
光场成像是一种在可见光波段得以广泛应用的计算成像方式,是一种对常规成像方式的增强与拓展。为了解决远红外相机存在的信噪比低下问题,本文通过引入光场成像的手段,设计了一种基于远红外相机的相机扫描构型光场成像系统,在4D全光函数理论与双平面光场参数化模型的基础上,通过采集关于样品对环境红外背景辐射反射的4D光场信息,并利用4D光场重构算法,实现对光场2D切片的预处理与4D光场的2D重构,以此实现了较之单纯光场成像手段更加显著的固定模式噪声抑制与信噪比提升效果。
Light Field Imaging is a computational imaging method which is developed for enhancing and extending the conventional imaging method,and currently widely used in visible band. In this paper,a passive light field imaging experiment based on far infrared camera and camera-scanning configuration is proposed. Based on 4 D plenoptic function principle and two-plane scheme,the 4 D light field information of sample from reflection of FIR background radiation is acquired by raster-scan of camera. And the 2 D image from 4 D light field is reconstructed by reconstruction algorithms of 4 D light field. Furthermore, pre-process the light field silces with the fixed-pattern noise information is acquired from 4 D light field,and the SNR of the reconstructed image is further enhanced.
Light Field Imaging is a computational imaging method which is developed for enhancing and extending the conventional imaging method,and currently widely used in visible band. In this paper,a passive light field imaging experiment based on far infrared camera and camera-scanning configuration is proposed. Based on 4 D plenoptic function principle and two-plane scheme,the 4 D light field information of sample from reflection of FIR background radiation is acquired by raster-scan of camera. And the 2 D image from 4 D light field is reconstructed by reconstruction algorithms of 4 D light field. Furthermore, pre-process the light field silces with the fixed-pattern noise information is acquired from 4 D light field,and the SNR of the reconstructed image is further enhanced.
引文
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[19]Chen C,Yi X,Zhao X,et al.Characterizations of VO2-based uncooled microbolometer linear array[J].Sensors and Actuators A:Physical,2001,90(3):212-214.
[2]Wilburn B,Joshi N,Vaish V,et al.High performance imaging using large camera arrays[C]//ACM Transactions on Graphics(TOG).ACM,2005,24(3):765-776.
[3]Yang J C,Everett M,Buehler C,et al.A real-time distributed light field camera[J].Rendering Techniques,2002:77-86.
[4]Zhang C,Chen T.A self-reconfigurable camera array[C]//ACM SIGGRAPH 2004 Sketches,ACM,2004:151.
[5]Adelson E H,Wang J Y A.Single lens stereo with a plenopticcamera[J].IEEE transactions on pattern analysis and machine intelligence,1992,14(2):99-106.
[6]Ng R,Levoy M,Brédif M,et al.Light field photography with a hand-held plenop-tic-camera[J].Computer Science Technical Report CSTR,2005,2(11):1-11.
[7]Georgiev T G,Lumsdaine A.Focused plenoptic camera and rendering[J].Journal of Electronic Imaging,2010,19(2):021106.
[8]Veeraraghavan A,Raskar R,Agrawal A,et al.Dappled photography:Mask enhanced cameras for heterodyned light fields and coded aperture refocusing[J].ACM Trans Graph,2007,26(3):69.
[9]Veeraraghavan A,Agrawal A,Raskar R,et al.Non-refractive modulators for encoding and capturing scene appearance and depth[C]//Computer Vision and Pattern Recognition,2008.CVPR 2008.IEEE Conference on.IEEE,2008:1-8.
[10]Agrawal A,Veeraraghavan A,Raskar R.Reinterpretable Imager:Towards Variable Post‐Capture Space,Angle and Time Resolution in Photography[C]//Computer Graphics Forum.Blackwell Publishing Ltd,2010,29(2):763-772.
[11]Ng R.Digital light field photography[D].California:stanford university,2006.Light Field Superresolution
[12]Bishop T E,Zanetti S,Favaro P.Light field superresolution[C]//Computational Photogra-phy(ICCP),2009 IEEE International Conferen-ce on.IEEE,2009:1-9.
[13]Bishop T E,Favaro P.Plenoptic depth estimation from multiple aliased views[C]//Computer Vision Workshops(ICCV Workshops),2009 IEEE 12th International Conference on.IEEE,2009:1622-1629.
[14]Zeller N,Quint F,Stilla U.Establishing a probabilistic depth map from focused plenoptic cameras[C]//3D Vision(3DV),2015 Interna-tional Conference on.IEEE,2015:91-99.
[15]Jain R,Grzyb J,Pfeiffer U R.Terahertz Light-Field Imaging[J].IEEE Transactions on Terahertz Science and Technology,2016,6(5):649-657.
[16]夏朝阳,田勇志,梁二军,等.基于相机阵列的红外光场成像[J].光学学报,2017(9):102-106.
[17]Adelson E H,Bergen J R.The plenoptic function and the elements of early vision[J].1991.
[18]Levoy M,Hanrahan P.Light field rendering[C]//Proceedings of the 23rd annual conference on Computer graphics and interactive techni-ques.ACM,1996:31-42.
[19]Chen C,Yi X,Zhao X,et al.Characterizations of VO2-based uncooled microbolometer linear array[J].Sensors and Actuators A:Physical,2001,90(3):212-214.