Effects of spatiotemporal averaging processes on the estimation of spectral reflectance in color digital holography using speckle illuminations
Effects of spatiotemporal averaging processes on the estimation of spectral reflectance in color digital holography using speckle illuminations
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DOI：
10.1364/ao.53.007072
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发表时间：
2014-10-20
期刊：
影响因子：
1.9
通讯作者：
Aizu, Yoshihisa
中科院分区：
文献类型：
--
作者：
Funamizu, Hideki;Shimoma, Shohei;Aizu, Yoshihisa
我们展示了时空平均过程对使用散斑照明的彩色数字全息术中光谱反射率估计的影响。在该技术中，从多模光纤发射的散斑场既用作参考波又用作照亮物体的波前。三个波长的两个相干波的干涉图案被记录为 CCD 相机上的数字全息图。通过使用振动器振动多模光纤来改变散斑场，并获取多个全息图以平均重建图像。在使用从多个全息图重建的图像执行平均过程（在本研究中我们称为时间平均过程）之后，使用平滑窗函数应用空间平均过程。为了估计重建图像中的光谱反射率，我们使用维纳估计方法。平均过程对颜色再现性的影响通过色品图、均方根误差和色差进行评估。 (C) 2014年美国光学学会
We present the effects of spatiotemporal averaging processes on an estimation of spectral reflectance in color digital holography using speckle illuminations. In this technique, speckle fields emitted from a multimode fiber are used as both a reference wave and a wavefront illuminating an object. The interference patterns of two coherent waves for three wavelengths are recorded as digital holograms on a CCD camera. Speckle fields are changed by vibrating the multimode fiber using a vibrator, and a number of holograms are acquired to average reconstructed images. After performing an averaging process, which we refer to as a temporal averaging process in this study, using images reconstructed from multiple holograms, a spatial averaging process is applied using a smoothing window function. For the estimation of spectral reflectance in reconstructed images, we use the Wiener estimation method. The effects of the averaging processes on color reproducibility are evaluated by a chromaticity diagram, the root-meansquare error, and color differences. (C) 2014 Optical Society of America