基于频域合成的计算机制半周视彩色彩虹全息  

Computer Generated Half-Circle View-Able Color Rainbow Hologram Based on Frequency Domain Synthesis

作　　者：杨鑫[1,2] 王辉[2,3] 李勇[2,3] 李志光 Yang Xin1,2, Wang Hui2,3, Li Yong2,3, Li Zhiguang2,3(Institute of Information Optics Engineering, Soochozv University, Suzhou, Jiangsu 215006, China ; 2Institute of Information Optics, Zhejiang Normal University, Jinhua, Zhejiang 321004, China; 3Key Laboratory of Optical Information Detecting and Display Technology of Zhej iang Province, J inhua , Zhej iang 321004, Chin)

机构地区：[1]苏州大学信息光学工程研究所,江苏苏州215006 [2]浙江师范大学信息光学研究所,浙江金华321004 [3]浙江省光信息检测与显示技术研究重点实验室,浙江金华321004

出　　处：《中国激光》2018年第3期293-299,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(11374267;61505177)

摘　　要：根据光路可逆的原理,提出了一种基于频域合成的计算机制半周视彩色彩虹全息算法。首先对半周视彩色彩虹全息的原理进行分析,总结了观察窗口与频域的对应关系,指出半周视彩色彩虹全息图物光的频谱由三原色的半环形频谱组合而成;使用彩色三维物体在特定方向上的多个投影图像分别进行分色、插值,再进行二维傅里叶变换,在频域内合成半周视彩色彩虹全息的物光频谱,对合成的物光频谱进行二维傅里叶逆变换,取实部,加上一个偏置分量,得到半周视彩色彩虹全息图。采用该算法计算了一个面积为47 mm×47 mm、分辨率为84000pixel×84000pixel的全息图,通过全息输出系统输出,再进行显影定影漂白,实现了可白光再现的半周视彩色彩虹全息图,其显示的三维效果逼真,颜色绚丽,可以同时供多人观赏。According to the reversible principle of optical path, a computer generated half-circle view-able color rainbow holographic algorithm based on frequency domain synthesis is proposed. Firstly, the principle of half-circle view-able color rainbow hologram is analyzed, and the corresponding relationship between observation window and frequency domain is summarized. It is pointed out that the frequency spectrum of half-circle view-able color rainbow hologram object light is composed of the half-ring frequency spectrum of three primary colors. A plurality of projection images in a specific direction of a color three-dimensional object are used to separately perform color separation and interpolation, and perform a two-dimensional Fourier transform. The object light frequency spectrum of the half-circle view-able color rainbow hologram in the frequency domain is synthesized. And the synthesis object light frequency spectrum is transformed by two-dimensional inverse Fourier transform. Half-circle view-able color rainbow hologram is got by taking the real part and adding a bias component. Using this algorithm, a hologram with the area of 47 mm × 47 mm and a resolution of 84000 pixel × 84000 pixel is calculated and output by the holographic output system. Then it is followed by development, fixation and bleaching. Half-circle view-able color rainbow hologram with white light reconstruction is realized. The hologram shows vivid three-dimensional effect, brilliant colors, and can be watched by many people at the same time.

关 键 词：全息 半周视彩色彩虹全息 计算机制全息 彩虹全息 傅里叶变换 傅里叶逆变换 

分 类 号：O438.1[机械工程—光学工程]