固态体积式真三维显示中的灰度级修正研究  

Study on Gray Scale Correction in SolidState Three Dimensional Volumetric Display

作　　者：方勇[1,2] 芦云龙 吴华夏[1,2] 吕国强[1,2] 胡跃辉[1,2] 

机构地区：[1]合肥工业大学光电技术研究院现代显示技术省部共建国家重点实验室,安徽合肥230009 [2]合肥工业大学计算机与信息学院,安徽合肥230009 [3]合肥工业大学科学技术研究院,安徽合肥230009

出　　处：《光学学报》2016年第11期342-349,共8页Acta Optica Sinica

基　　金：国家863计划(2012AA011901)

摘　　要：基于聚合物稳定胆甾相液晶(PSCT)光阀的固态体积式真三维(3D)显示体,在状态转换瞬间其雾度和透射率的非线性变化会引起成像亮度变化,并引起深度图像间的串扰。通过分析PSCT光阀的光电响应特性和显示体驱动方式,推导出显示体成像亮度的变化函数,并据此计算出子帧亮度和灰度级偏差。通过调整光阀的驱动时序和重新分配数字微镜器件子帧,结合伽马校正,实现了灰度级的修正。给出了在真3D样机上显示的灰度级修正前后的3D成像,实验结果表明,该方法在亮度损失较小(约6%)的前提下,有效地修正了真三维成像的灰度级偏差,并基本消除了深度图像间的串扰,在一定程度上提高了3D显示的成像质量。The screen of solid-state volumetric three-dimensional（3D）display system is based on a polymer stabilized cholesteric texture normal-mode（PSCT）shutter array structure.The nonlinear variation of haze and transmittance of the shutter causes the image luminance deviation,as well as the image crosstalk between adjacent shutters.The photoelectric response characteristic and driving method of the PSCT shutter array are analyzed.Based on the analysis,the image luminance variation function of shutter array is derived,and thus the luminance of sub-frames and grayscale deviations are calculated.Grayscale correction is implemented through adjusting the driving timing of shutters and reallocating sub-frames,combined with Gamma correction.3Dimages before and after grayscale correction are displayed on the solid-state 3D volumetric display system.Experimental results indicate that the proposed method can correct the grayscale deviations efficiently and eliminate the image crosstalk between adjacent shutters mainly at the cost of a minor luminance loss（about 6%）.The proposed approach can improve the 3Dimage quality to some extent.

关 键 词：视觉光学 固态体积式真三维显示 灰度级修正 聚合物稳定胆甾相液晶光阀 子帧 伽马校正 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]