Alex Filip

co-author(s): Stella Graßhof

Towards Digitisation of Technical Drawings in Architecture: Evaluation of CNN Classification on the Perdaw Dataset - Springer Nature Switzerland

In a highly digitalised world, this paper aims at closing the gap towards automatic digitisation from 2D architectural drawings. We present the new image dataset Plan, and Elevation Representations of Doors And Windows (Perdaw) which provides a baseline for different classification problems with varying complexity. We investigate the per formance of three machine learning models in distinguishing different types of doors and windows in their plan and elevation views. Our findings show that Inception V3 slightly outperforms MobileNet V2, which suggests that the latter solves the same classification tasks with less computational resources with only a minimal compromise in accuracy. Among the three investigated models, ResNet50 yields the lowest quality metrics within a small margin. Overall, all models perform better at classifying building components in their elevation views compared to their plan views. We consistently observed that the models yield the best results with 100% accuracy for the binary classification problems, and dropped to close to 70% accuracy for the 40-class classification problems.

3D reconstruction of buildings based on architectural floor plans, using Open Computer Vision and Optical Character Recognition - No publisher

The following Research Paper sets out to investigate possible solution for an automatized 3D Reconstruction method based on architectural floor plans. Having an emphasis on Computer Science, the paper sets out to explore the larger context of the topic through astructured literature review whilst also presenting terminologies and prevalent technologies within the architecture, engineering and construction (AEC) field, as well as the relationships and dependencies between them. The second part of the paper focuses on the process of experimentation with different Computer Vision and Optical Character Recognition libraries, in an attempt to design and test an initial reconstruction program prototype from a 2D architectural floor plan onto a 3D environment. Finally, the paper concludes with the literature review, the results of the implementations, and key takeaways and sets a course for future work.