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A psychophysical experiment is performed on two large-size liquid crystal displays under three viewing conditions to assess perceptual contrast.Based on the visual data,the performance of CIECAM02 in predicting perceptual contrast under different viewing conditions is tested and compared with other models by F-test.Results show that the perceptual contrast models in the form of Weber contrast using CIECAM02 brightness Q agreed better with the contrast perception of human visual system compared to the models using luminance,CIELAB lightness L?,and CIECAM02 lightness J. 相似文献
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可调谐液晶滤波器的调谐性能研究 总被引:6,自引:0,他引:6
在电调谐液晶法布里一珀罗腔滤波器的连续调谐过程中,存在“透射峰跳跃”现象,影响器件的单调调谐性。为了改善器件的单调调谐性能,对此现象进行了分析,表明这是由于法布里—珀罗腔干涉级次在调谐过程中发生改变引起的;进而给出了法布里一珀罗腔透射波长λ,干涉级次m与腔内介质折射率n的关系,以及器件实际的有效调谐范围。当腔长为10μm、折射率差为0.05时,就可以使器件的单调调谐范围达到整个C波段。数值模拟与实验结果相吻合。并针对改善器件的单调调谐性能,提出了几种可行的方案。 相似文献
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多腔薄膜梳状滤波器中心波长温度稳定性分析 总被引:3,自引:0,他引:3
利用高桥模型详细分析了多腔薄膜梳状滤波器的中心波长温度稳定性问题。发现由于多腔薄膜梳状滤波器的固体腔较厚而反射镜膜系的厚度相对较薄,因此膜系与固体腔之间的温度引起的弹性应力导致的膜系光学常数的变化已经不是主要影响因素,而固体腔材料的折射率温度系数引起的中心波长漂移对整个器件的影响较大。计算表明对于一个密集波分复用中使用的100 G信道间隔的三腔薄膜梳状滤波器而言,当固体腔材料(熔融石英)的折射率温度系数为1×10-5/℃时,器件的中心波长漂移在-40 ℃~85 ℃的温度范围内可达±1 nm。 相似文献
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为了研究不同空间频率和颜色方向的彩色对比灵敏度特性,在O.5~11.7 cycle/(°)的空间频率范围内分别在6°和10°视场下以灰色或红色为颜色中心,在CIELAB颜色空间的等亮度面上选取6个颜色方向,采用交叉阶梯法通过心理物理视觉实验测得以色差阈值倒数定义的彩色对比灵敏度.基于实验数据比较了不同颜色方向上低通形式... 相似文献
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Radiometric compensation algorithm for color reproduction of projection display on patterned surface
<正>A novel radiometric compensation algorithm is proposed to correct the color distortions of the projection display on patterned surface.Two choices of the objective image are investigated in this algorithm.A linear compression followed by a sigmoid-function transformation based on the statistical parameters of the compensating radiance map is performed to reduce the clippings of the compensating color and expected to properly reproduce the dynamic range and the visibility of the image content.Three types of projection displays are produced for each test image.The parameter analysis indicates that the compensated displays could well conceal the surface pattern and tend to exhibit higher lightness or lightness contrast in the camera.The comparison results in a psychophysical experiment demonstrate that all the compensated displays outperform the uncompensated ones.The original input images seem more appropriate to be selected as the objective images,and the predicted objectives on the white screen are just proper for the bright and low-contrast input images displayed on the faint surface. 相似文献
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