{"title":"Speckle Characterization in Laser Projector Display","authors":"Meifang Xu, Yunbo Shi, Guoxian Tang, Jun Liu, Xuyuan Chen","volume":63,"journal":"International Journal of Physical and Mathematical Sciences","pagesStart":261,"pagesEnd":265,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/7816","abstract":"Speckle phenomena results from when coherent\nradiation is reflected from a rough surface. Characterizing the speckle\nstrongly depends on the measurement condition and experimental\nsetup. In this paper we report the experimental results produced with\ndifferent parameters in the setup. We investigated the factors which\naffects the speckle contrast, such as, F-number, gamma value and\nexposure time of the camera, rather than geometric factors like the\ndistance between the projector lens to the screen, the viewing distance,\netc. The measurement results show that the speckle contrast decreases\nby decreasing F-number, by increasing gamma value, and slightly\naffects by exposure time of the camera and the gain value of the\ncamera.","references":"[1] P. Janssens, K. Malfait, \"Future prospects of high-end laser projectors\",\nProc. SPIE 7232, 7232-34 (2009).\n[2] Victor Yurlov, Anatoly Lapchuk, Sangkyeong Yun, Jonghyeong Song,\nInjae Yeo, Haengseok Yang, and Seungdo An. \"Speckle suppression in\nscanning laser displays: aberration and defocusing of the projection\nsystem\". APPLIED OPTICS,Vol. 48, No.1,80-90 (2009).\n[3] M. Nadeem Akram, Zhaomin Tong, Guangmin Ouyang, Xuyuan Chen,\nand Vladimir Kartashov, \"Laser speckle reduction due to spatial and\nangular diversity introduced by fast scanning micromirror\", Appl. Opt.,\nVol. 49, No. 17, 3297-3304(2010).\n[4] M. Nadeem Akram, Vladimir Kartashov, and Zhaomin Tong, \"Speckle\nreduction in line-scan laser projectors using binary phase codes\", Opt.\nLett., Vol. 35, No. 3, 444-446(2010).\n[5] Guangmin Ouyang, Zhaomin Tong, M. Nadeem Akram, Kaiying Wang,\nVladimir Kartashov, Xin Yan, and Xuyuan Chen, \"Speckle reduction\nusing a motionless diffractive optical element\", Opt. Lett., Vol. 35, No.\n17, 2852-2854(2010).\n[6] A.C. V\u00f6lker, P. Zakharov, B. Weber, F. Buck and F. Scheffold, \"Laser\nspeckle imaging with an active noise reduction scheme\", Opt. Expr., Vol.\n13, No. 24, 9782-9787(2005).\n[7] Ichiro Fujieda, Takashi Kosugi, and Yuta Inaba, \"Speckle Noise\nEvaluation and Reduction of an Edge-Lit Backlight System Utilizing\nLaser Diodes and an Optical Fiber\", Journal of Display Technology,\nVol.5, No.11, 414-417(2009).\n[8] Lee, Y. M., Park, J. M., Park, S. Y. and Lee, S. G., \"A study of the\nrelationships between human perception and the physical phenomenon of\nspeckle\", SID Int. Symp. Digest Tech. Papers P-45, 1347-1350 (2008).\n[9] ICDM Home Page. http:\/\/icdm-sid.org\/.\n[10] J.W. Goodman, \"Speckle Phenomena in Optics\", Roberts and Company,\nEnglewood, Colorado, 2007.\n[11] A. Ennos, \"Speckle interferometry,\" in Laser Speckle and Related\nPhenomena, J.C. Dainty, ed. (Springer-Verlag, 1975).\n[12] http:\/\/www.osiris-project.eu\/uploads\/presentations\/laser_projector_spec\nkle_measurements_sideurodisplay09.pdf.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 63, 2012"}