调频加网对于全息再现图像的影响  

Effect of Frequency Modulation Screening on Quality of Holographic Reproduction Image

作　　者：解文博 王庆[1] XIE Wen-bo;WANG Qing(Qilu University of Technology,Jinan 250353,China)

机构地区：[1]齐鲁工业大学,济南250353

出　　处：《包装工程》2023年第9期282-288,共7页Packaging Engineering

摘　　要：目的对全息图进行加网处理,实现计算全息图的二值化,将计算全息图应用于印刷领域。方法本文设计计算全息图进行调频加网的整体方案,讨论不同的加网算法对计算全息再现图像的质量影响。首先,对3幅不同类型的灰度图片进行计算全息编码得到全息图;然后利用误差扩散算法和抖动算法对全息图进行调频加网获得二值化全息图;之后通过光场重建得到全息再现图像。结果对全息再现图像进行峰值信噪比和结构相似性数据比较发现,误差扩散算法更适用于计算全息二值化处理,抖动加网使计算全息图产生周期性图案,导致再现全息图产生混频现象,全息再现图像的质量下降。结论加网导致全息图再现质量下降,误差扩散算法可以得到较好的再现像,适用于全息图的二值化处理;与此同时,抖动算法会产生混频现象,因此抖动算法并不适用于全息图二值化处理。The work aims to screen the hologram to realize the binarization of the computational hologram and apply the computational hologram to the printing field.An overall scheme of frequency modulation screening for computational hologram was designed and the effects of different screening algorithms on the quality of holographic reproduction image were discussed.Firstly,three types of grayscale images were holographically encoded to obtain holograms and then these holograms were subject to frequency modulation screening to gain binarized holograms by the error diffusion and dithering algorithms.Finally,the binarized holograms were transformed holographic reproduction images by means of light field.According to the comparison between the peak signal-to-noise ratio(PSNR)and the structure similarity index measure(SSIM)data of holographic reproduction images,the error diffusion algorithm was more suitable for computing holographic binarization and the dithering screening caused periodic patterns on the holograms,which resulted in frequency mixing phenomena on the holographic reproduction images,so the quality of the holographic reproduction images was reduced.Screening degrades the quality of holographic reproduction images.The error diffusion algorithm has better reproduction images and is suitable for hologram binarization.Furthermore,the dithering algorithm produces frequency mixing,so it is not suitable for hologram binarization.

关 键 词：计算全息 相位恢复算法 数字加网 误差扩散算法 抖动算法 

分 类 号：TS801.8[轻工技术与工程]