利用数值再现实现彩虹全息色差评价

Color Difference of Computer Generated Rainbow Hologram Based on Numerical Reconstruction

为了在计算机制彩色彩虹全息图输出之前定量得到再现像的色彩保真度,提出了一种采用数值再现进行色差评价的方法.首先对彩虹全息图进行了频谱分析,得到再现参量与频谱分布之间的关系;然后采用频域滤波算法实现彩色彩虹全息图数值再现,得到再现像的相对功率谱分布;最后采用CIE1976UCS均匀颜色空间对再现像色差情况进行了计算.设计了7个色块并制作了计算机制真彩色彩虹全息图,以金卤射灯作为照明光源进行了光学再现实验,给出实验结果及分析.研究证明了采用数值再现方法实现对计算彩虹全息再现像光谱分布和色差进行计算分析是一种快速经济的方法.

In order to obtain color fidelity of reconstructed image before the computer generated rainbow hologram printed and reconstructed optically,a color difference test method based on numerical reconstruction is proposed.Firstly,the computer generated rainbow hologram is analyzed in special frequency domain.The relationships between reconstruction parameters and special frequency distribution are concluded.Then,the spectrum distributions of reconstructed images are obtained through simulated reconstruction of computer generated rainbow hologram by filtering in frequency domain.Moreover,the color difference of reconstructed image is calculated in CIE1976UCS uniform color space.Seven color cards are designed and with its computer generated rainbow holograms.The color differences are tested with the proposed method.The optical experiments are designed with the illumination of halogen light source.The results and analysis are presented and show that the proposed method is effective and fast way for the analysis of spectral distribution and color difference of computer generated rainbow hologram.