基于液晶显示器的无透镜单像素成像研究

摘要/Abstract

摘要： 根据获取物体傅里叶频谱实现单像素成像的理论，提出了通过对液晶显示器(LCD)加载一系列灰度条纹图像，并利用置于屏幕前的单点光电探测器接收物体透射光强，来实现无透镜单像素成像的方法。该系统降低了对硬件的要求，光路紧凑，灵活性强。从理论上证明了LCD加载图像时图像灰度与透射光强之间存在的非线性关系对系统成像没有影响，从实验上验证了该方法的可行性。该系统的成像实验表明，加载条纹后需预留给显示器液晶分子一定的响应时间,使探测器准确获取光强，可显著减小背景噪声和共轭像干扰，提高重建图像质量。

关键词: Gamma曲线

Abstract: Based on the theory of single pixel imaging by means of Fourier spectrum acquisition, a single-pixel lens-free imaging method is proposed by loading a series of gray stripes on a liquid crystal display (LCD) screen and placing a single pixel photoelectric detector in front of it to receive the light projected by an object. Such an imaging system lowers the hardware requirements, being optically compact and flexible. It is verified theoretically that the nonlinearity between the gray scale of the image loaded on the LCD and the intensity of transmitted light has no effects on reconstructed images. The effectiveness of the imaging method is confirmed experimentally. Experimental results show that by reserving a short period of time for the liquid crystal molecules to response after the mask is loaded, the detector is able to detect the light intensity accurately, reduce background noise and interference of conjugate image, and thus improve the quality of reconstructed image.

Key words: Gamma curve

中图分类号:

O438

范晓杭田勇志韩建辉梁二军. 基于液晶显示器的无透镜单像素成像研究[J]. J4, 2016, 33(4): 405-410.

参考文献

[1]Cui X, Lee L M, Heng X, et al.Lensless high-resolution on-chip optofluidic microscopes for Caenorhabditis elegans and cell imaging[J].Proceedings of the National Academy of Sciences, 2008, 105(31):10670-10675
[2]Pang S, Cui X, DeModena J, et al.Implementation of a color-capable optofluidic microscope on a RGB CMOS color sensor chip substrate[J].Lab on a Chip, 2010, 10(4):411-414
[3]Zheng G, Lee S A, Antebi Y, et al.The ePetri dish,an on-chip cell imaging platform based on subpixel perspective sweeping microscopy (SPSM)[J].Proceedings of the National Academy of Sciences, 2011, 108(41):16889-16894
[4]Lee S A, Leitao R, Zheng G, et al.Color capable sub-pixel resolving optofluidic microscope and its application to blood cell imaging for malaria diagnosis[J].PloS one, 2011, 6(10):e26127-
[5]Garcia-Sucerquia J, Xu W, Jericho M H, et al.Immersion digital in-line holographic microscopy[J].Optics letters, 2006, 31(9):1211-1213
[6]Bishara W, Sikora U, Mudanyali O, et al.Holographic pixel super-resolution in portable lensless on-chip microscopy using a fiber-optic array[J].Lab on a Chip, 2011, 11(7):1276-1279
[7]Isikman S O, Bishara W, Mavandadi S, et al.Lens-free optical tomographic microscope with a large imaging volume on a chip[J].Proceedings of the National Academy of Sciences, 2011, 108(18):7296-7301
[8]Greenbaum A, Luo W, Su T W, et al.Imaging without lenses: achievements and remaining challenges of wide-field on-chip microscopy[J].Nature methods, 2012, 9(9):889-895
[9]Wei Q, McLeod E, Qi H, et al.On-chip cytometry using plasmonic nanoparticle enhanced lensfree holography[J]. [J].Scientific Reports, 2013, 3:1699-
[10]Tseng D, Mudanyali O, Oztoprak C, et al.Lensfree microscopy on a cellphone[J].Lab on a Chip, 2010, 10(14):1787-1792
[11]Zhang Q, Langrock C, Fejer M M, et al.Waveguide-based single-pixel up-conversion infrared spectrometer[J].Optics express, 2008, 16(24):19557-19561
[12]Ma Y, Grant J, Saha S, et al.Terahertz single pixel imaging based on a Nipkowdisk[J].Optics letters, 2012, 37(9):1484-1486
[13]Withayachumnankul W, Abbott D.Terahertz imaging: Compressing onto a single pixel[J].Nature Photonics, 2014, 8(8):593-594
[14]Donoho D L.Compressed sensing[J].Information Theory, IEEE Transactions on, 2006, 52(4):1289-1306
[15]Duarte M F, Davenport M A, Takhar D, et al.Single-pixel imaging via compressive sampling[J].IEEE Signal Processing Magazine, 2008, 25(2):83-
[16]Pittman T B, Shih Y H, Strekalov D V, et al.Optical imaging by means of two-photon quantum entanglement[J].Physical Review A, 1995, 52(5):R3429-
[17]Strekalov D V, Sergienko A V, Klyshko D N, et al.Observation of two-photon “ghost” interference and diffraction[J].Physical review letters, 1995, 74(18):3600-
[18]Shapiro J H.Computational ghost imaging[J].Physical Review A, 2008, 78(6):061802-
[19]Sun B, Edgar M P, Bowman R, et al.D computational imaging with single-pixel detectors[J].Science, 2013, 340(6134):844-847
[20]Bertolotti J, van Putten E G, Blum C, et al.Non-invasive imaging through opaque scattering layers[J].Nature, 2012, 491(7423):232-234
[21]Durán V, Soldevila F, Irles E, et al.Compressive imaging in scattering media[J].Optics Express, 2015, 23(11):14424-14433
[22]Pei L, Ren-kui Z, Jun-hua H E, et al.吕沛, 周仁魁, 何俊华, 等. 水下单像素成像系统研究[J].光电子激光, 2011, 22(9):1425-1430
[23]Zhang Z, Ma X, Zhong J.Single-pixel imaging by means of Fourier spectrum acquisition[J]. [J]., 2015, :-
[24]Bian L, Suo J, Hu X, et al.Fourier computational ghost imaging using spectral sparsity and conjugation priors[J]. [J].arXiv preprint arXiv:1504.03823, 2015, :-