Abstract

This contribution proposes a methodological approach for the transfer of annotations between orthophotos and 3D digital heritage models, relying on a mesh-based/point-based representation. The workflow leverages on the exploitation of 2D/3D projective relations and on the identification, propagation, modelling and tiling of virtual models of architectural heritage. Referring to the significant case study of Pisa Cathedral, the method is tested to ensure an informative continuum between 2D medias and 3D representations, in terms of morphology, geometry and semantic enrichment. At first, a high resolution ortho-photo is created to support studies related to conservation and restoration, e.g. to highlight degradation patterns and materials as well as to distinguish cracks, frescoed surfaces, decorations. Then, the information is translated from the 2D support to a virtual 3D mockup: this step is essential to ensure a complete understanding of the architectural heritage object, that can thus be studied in its entirety, considering its morphological complexities. The proposed approach provides a more effective system for the transfer and exchange of semantic information from high-resolution orthophotos to semantically rich 3D models, that can be fundamental even in view of the construction of Heritage-Building Information Modeling (H-BIM) environments.

摘要

该贡献提出了一种方法论方法，用于在正射影像和 3D 数字遗产模型之间传输注释，依赖于基于网格/基于点的表示。该工作流利用 2D/3D 投影关系的开发以及建筑遗产虚拟模型的识别、传播、建模和平铺。参考比萨大教堂的重要案例研究，该方法经过测试以确保 2D 媒体和 3D 表示之间的信息连续性，在形态学、几何学和语义丰富方面。首先，创建高分辨率正射照片以支持与保护和修复相关的研究，例如突出显示退化模式和材料以及区分裂缝、壁画表面、装饰。然后，信息从 2D 支持转换为虚拟 3D 模型：这一步对于确保对建筑遗产对象的完整理解至关重要，因此可以在考虑其形态复杂性的情况下对其进行整体研究。所提出的方法为将语义信息从高分辨率正射影像传输和交换到语义丰富的 3D 模型提供了一个更有效的系统，即使考虑到遗产建筑信息模型 (H-BIM) 环境的构建，这也可能是基础。