Digitalization of existing buildings and the creation of 3D BIM models for them has become crucial for many tasks. Of particular importance are floor plans, which contain information about building layouts and are vital for processes such as construction, maintenance or refurbishing. However, this data is not always available in digital form, especially for older buildings constructed before CAD tools were widely available, or lacks semantic information. The digitalization of such information usually requires manual work of an expert that must reconstruct the layouts by hand, which is a cumbersome and error-prone process. In this paper, we present a pipeline for reconstruction of vectorized 3D models from scanned 2D plans, aiming at increasing the efficiency of this process. The method presented achieves state-of-the-art results in the public dataset CubiCasa5k, and shows good generalization to different types of plans. Our vectorization approach is particularly effective, outperforming previous methods.

翻译：现有建筑数字化及其三维BIM模型构建已成为许多任务的关键环节。其中，包含建筑布局信息的平面图对于施工、维护或翻新等过程至关重要。然而，这类数据并非总是以数字形式存在——尤其是在计算机辅助设计工具普及前建造的老旧建筑中，或缺乏语义信息。此类信息的数字化通常需要专家手动重建布局，流程繁琐且易出错。本文提出了一种从扫描二维图纸重建矢量化三维模型的流水线，旨在提升该流程的效率。所提出的方法在公开数据集CubiCasa5k上取得了当前最佳结果，并对不同类型平面图展现出良好的泛化能力。我们的矢量化方法尤其有效，性能优于先前方法。