大视角高分辨彩色全息3D图像的多孔径拼接全息打印方法

Digital holographic 3D printing technique is the research hotspot of 3D display at home and abroad, and has significant application values in the field of 3D information visualization, such as heritage conservation & exhibition, 3D medical imaging, and holographic 3D maps & sand tables, etc. This project aims at the key issues of digital holographic printing method for full-color holographic 3D imaging, such as imaging quality, viewing angle and printing efficiency. The research emphasis are as follows: ①. Analyze the relationships between viewing angle of printed holographic 3D images and maximum diffraction angle of recording materials and viewing angle of imaging objective, and improve the viewing angle of the holographic 3D image by using multiple-aperture stitching holographic print. ②. Analyze the influence factors of imaging resolution of holographic printing system, such as imaging performance of objective, etc.; Research the preprocessing method of elemental images for correcting the image distortion and stitching of central area of multiple objective-apertures for improving the resolution of holographic printing with large angle of view; exploring the methods of improving the imaging quality of holographic printing. The research results can provide new methods and technical supports for promoting the development and applications of holographic 3D printing technique.

数字化全息3D打印在文物保护与展示、医学3D成像、全息3D地图(沙盘)等3D可视化领域具有重要的应用价值，是国内外3D显示领域的研究热点。本项目针对全息打印3D图像的成像质量、可视角度等问题，开展如下研究工作：①.分析全息3D图像的可视角度与记录材料极限衍射角、缩微镜头视场角的相互关系，研究多孔径拼接大视角全息打印方法，以获得大视角全息3D打印图像；②.分析全息打印系统成像分辨率与缩微镜头成像性能等因素的关系，研究通过基元图像预处理的方式对缩微成像镜头的像场畸变进行补偿，通过多个物镜中心高分辨视场的拼接提高大视角全息3D图像的成像分辨率。研究成果可为推动全息3D打印技术的发展和应用提供新的方法和技术支持。

大幅面大视角高精度的彩色全息3D打印是国内外3D显示领域的研究热点和难点。在国家自然科学基金的支持下，本研究针对大幅面大视角全息打印3D技术，开展了以下研究工作：①. 设计了基于4个缩微成像镜头空间对称分布的多孔径拼接方式的大视角全息打印方案；构建了一套基于直立式二维移动平台的大幅面全息打印实验系统。②.分析了全息打印系统成像分辨率与缩微镜头成像性能等因素的关系，研究了通过基元图像预处理的方式对缩微成像镜头的像场畸变进行补偿；③.分析了全息3D图像的可视角度与记录材料极限衍射角、缩微镜头视场角的相互关系;④. 构建了基于GPU+CPU协同并行计算环境，实现了基元图像的快速编码生成和图像预处理。 研究成果可为大幅面高分辨全息3D打印技术提供新的方法和技术支持。