大型三维网格模型远程绘制的新机理研究

With rapid progress of digital archiving technology, we can obtain and store large 3D mesh models of high-precision digital cultural heritage. The goal of this project is to let ordinary users better sharing them by internet. Then, it can let our national cultural heritage better-known. For large three-dimensional mesh models of the subsequent applications, the topic of this research is how to make the ordinary users through internet can access all kinds of costliness of large 3D mesh models. We address a theory of image-based mixed remote rendering, and propose a noval method for geometric correction by ray of image-based rendering on a single server/clients structure. We sample texture images from rendered large 3D mesh models, and build texture image database using hash functions. We also build objective ray functions on surface of large 3D mesh models. We realise a method of interactive viewpoint reconstruction in remote clients. We distinctly render remote large 3D mesh models using 3D low-level mesh and texture images' database. Then, the digital copyright of costliness large 3D mesh models also is protected to prevent piracy. This proposal addresses a novel thought for mesh models of remote rendering to compare with being pure image-based and model-based remote rendering.

随着数字化存档技术的快速进步，我们能获取和储存高精度数字文化遗产的大型三维网格模型。让普通用户通过互联网更多地分享数字文化遗产，能进一步提升我国文化遗产的知名度。针对大型三维网格模型的后续应用问题，本课题研究如何让普通用户通过互联网访问高价值数字文化遗产的各种大型三维网格模型的问题。研究基于图像的混合远程绘制原理，提出单一服务器/多客户端结构的基于光线几何修正的图像绘制方法。对绘制的大型三维网格模型实现纹理图像的采样，利用哈希函数构建纹理图像库。建立大型三维网格模型表面的目标光线函数，实现远程交互式视点重建方法。利用基于三维低分辨率网格和纹理图像库逼真地远程绘制大型三维网格模型，而高价值的大型三维网格模型的数字版权又可以得到保护。相比现有单纯基于图像的远程绘制和基于模型的远程绘制，本课题为网格模型的远程绘制提供一种新的思路。

针对高价值数字文化遗产的大型三维网格模型的特性，提出了一种新的基于图像的远程绘制方法。在服务器端，预先绘制大型三维网格模型，结合层次细节方法构建大型三维网格模型的混合数据结构。在客户端，我们提出了一种新的基于图像的混合远程绘制方法。通过计算漫射颜色信息，实现了修正几何信息的栅格化远程绘制，得到带精确纹理映射的视点重建效果。实现了单一服务器和多客户端之间的高效负载均衡，使得每个客户端与网络之间的单一数据流量不大于0.3MB/s，浏览时延不大于100ms（帧率不低于10fps）。实现了大型三维网格模型任何角度视点的实时远程高逼真绘制。开发了一个基于图像的大型三维网格模型远程人机智能交互式绘制的原型系统。培养研究生5人。通过本项目的研究形成了理论研究成果包括5篇SCI国际期刊论文（影响因子大于1.5的两篇，IEEE Transactions论文两篇）。国家发明专利2项。计算机软件著作权2项。