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Based on the electro-optical characteristics of the transmission-type liquid crystal (LC) and DSP (Digital Signal Processor, chip TMS320DM642) technology, a smart network camera system for partial gating strong light intensity is developed. An LC display driver is controlled by DSP to achieve light intensity transmittance of every single pixel in this system; the light intensity transmittance can be decreased by two orders of magnitude. In addition, the smart camera of video signal processed under a strong light can be transmitted through network transmission and real-time storage to PC by another DSP (chip TMS320DM6437). Thus the LC delay time is about 25.5 ms and the system circuit delay time is about 17 μs, while the storage hard disk capacity requires 8.648 Gbit in 24 h. Experimental images are taken by the prototype to shoot the simulated license plate illuminated by the strong light (greater than 2.2×105 lx). Results show that the imaging problems, viz the ordinary CCD camera may give partially overexposed images and cannot distinguish details under the strong light, are all solved and achieved a high dynamic range imaging by the prototype.
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Keywords:
- liquid crystal /
- DSP /
- light transmittance /
- high dynamic range imaging
[1] Tang Y H, Cao X G, Liu H C, Shepherd G G, Liu S L, Gao H Y, Yang X S, Wu Y, Wang S W 2012, Appl. Opt. 51 1968
[2] Gu L, Hu X D, Luo C Z, Xu Z 2002 Acta Phot. Sin. 31 12 (in Chinese) [谷林, 胡晓东, 罗长洲, 徐洲 2002 光子学报 31 12]
[3] Jing L X, Lv Z M, Xiong J W 2002 Opt. Precis. Eng. 10 588 (in Chinese) [金龙旭, 吕增明, 熊经武 2002 光学精密工程 10 588]
[4] Hu B L, Ma C W, Sun Y S 2002 Acta Phot. Sin. 31 504 (in Chinese) [胡炳梁, 马彩文, 孙益善 2002 光子学报 31 504]
[5] Estera J P, Sakdana M R 2003 SPIE 5079 212
[6] Estera J P, Sakdana M R 2003 SPIE 4796 60
[7] Debevec P E, Malik J 2008 ACM Siggraph 2008 Classes (Beijing) 2008 p31
[8] Liu C, Hu L F, Mu Q Q 2012 Acta Phys. Sin. 61 129501 (in Chinese) [刘超, 胡立发, 穆全全 2012 61 129501]
[9] Zheng J H, Zhong Y W, Wen K 2010 Acta Phys. Sin. 59 1831 (in Chinese) [郑继红, 钟阳万, 温垦 2010 59 1831]
[10] Tang Y H, Zhang R X, Gao H Y, Liu K, Zhao G X, Yang X S, Li Q, Liang Y, Ye N, Liu H C, Liu S L 2010 Opt. Express 18 10616
[11] Tang Y H, Yang X S, Gao H Y, Wu Y, Wang S W, Cao X G, Jia W L 2013 J. Quant Spectrosc Radiat Transf 122 87
[12] Tang Y H, Zhang R X, Liu H C, Liu S L, Liu K, Gao H Y 2010 J. Liquid Crystals and Display 25 200 (in Chinese) [唐远河, 张瑞霞, 刘汉臣, 刘术林, 刘锴, 郜海阳 2010 液晶与显示 25 200]
[13] Tang Y H, Wu Y, Yang X S, Wang S W 2013 Patent 201310011154.6 [2013.1.11]
[14] Pescador F, Maturana G, Garrido M, Juarez E, Sanz C 2009 IEEE Transactions on Consumer Electronics 55 205
[15] Tang Y H, Liu H C 1999 Practical technology and art of photography (Xian: Xian MapPress) (in Chinese) 27 [唐远河, 刘汉臣 1999 实用摄影技术与艺术 (西安: 西安地图出版社) 第27页]
[16] Zhao J L, Ren G J 2006 J. Liquid Crystals and Display 21 384 (in Chinese) [赵阶林, 任广军 2006 液晶与显示 21 384]
[17] Liu Y J, Xu K S, Zhang B 2004 Acta Phys. Sin. 53 1850 (in Chinese) [刘言军, 徐克璹, 张斌 2004 53 1850]
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[1] Tang Y H, Cao X G, Liu H C, Shepherd G G, Liu S L, Gao H Y, Yang X S, Wu Y, Wang S W 2012, Appl. Opt. 51 1968
[2] Gu L, Hu X D, Luo C Z, Xu Z 2002 Acta Phot. Sin. 31 12 (in Chinese) [谷林, 胡晓东, 罗长洲, 徐洲 2002 光子学报 31 12]
[3] Jing L X, Lv Z M, Xiong J W 2002 Opt. Precis. Eng. 10 588 (in Chinese) [金龙旭, 吕增明, 熊经武 2002 光学精密工程 10 588]
[4] Hu B L, Ma C W, Sun Y S 2002 Acta Phot. Sin. 31 504 (in Chinese) [胡炳梁, 马彩文, 孙益善 2002 光子学报 31 504]
[5] Estera J P, Sakdana M R 2003 SPIE 5079 212
[6] Estera J P, Sakdana M R 2003 SPIE 4796 60
[7] Debevec P E, Malik J 2008 ACM Siggraph 2008 Classes (Beijing) 2008 p31
[8] Liu C, Hu L F, Mu Q Q 2012 Acta Phys. Sin. 61 129501 (in Chinese) [刘超, 胡立发, 穆全全 2012 61 129501]
[9] Zheng J H, Zhong Y W, Wen K 2010 Acta Phys. Sin. 59 1831 (in Chinese) [郑继红, 钟阳万, 温垦 2010 59 1831]
[10] Tang Y H, Zhang R X, Gao H Y, Liu K, Zhao G X, Yang X S, Li Q, Liang Y, Ye N, Liu H C, Liu S L 2010 Opt. Express 18 10616
[11] Tang Y H, Yang X S, Gao H Y, Wu Y, Wang S W, Cao X G, Jia W L 2013 J. Quant Spectrosc Radiat Transf 122 87
[12] Tang Y H, Zhang R X, Liu H C, Liu S L, Liu K, Gao H Y 2010 J. Liquid Crystals and Display 25 200 (in Chinese) [唐远河, 张瑞霞, 刘汉臣, 刘术林, 刘锴, 郜海阳 2010 液晶与显示 25 200]
[13] Tang Y H, Wu Y, Yang X S, Wang S W 2013 Patent 201310011154.6 [2013.1.11]
[14] Pescador F, Maturana G, Garrido M, Juarez E, Sanz C 2009 IEEE Transactions on Consumer Electronics 55 205
[15] Tang Y H, Liu H C 1999 Practical technology and art of photography (Xian: Xian MapPress) (in Chinese) 27 [唐远河, 刘汉臣 1999 实用摄影技术与艺术 (西安: 西安地图出版社) 第27页]
[16] Zhao J L, Ren G J 2006 J. Liquid Crystals and Display 21 384 (in Chinese) [赵阶林, 任广军 2006 液晶与显示 21 384]
[17] Liu Y J, Xu K S, Zhang B 2004 Acta Phys. Sin. 53 1850 (in Chinese) [刘言军, 徐克璹, 张斌 2004 53 1850]
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