Andrea Fiori
Application of Convolutional Neural Networks for the analysis of soap film surface.
Rel. Luca Bergamasco, Eliodoro Chiavazzo. Politecnico di Torino, Master of science program in Energy And Nuclear Engineering, 2025
Abstract
The quantitative characterization of thin-film dynamics is fundamental to understanding complex fluid-dynamic phenomena of a soap film. The chaotic nature, rapid evolution, and tendency of flow patterns on soap films to merge make their analysis based on image processing via traditional methods exceedingly difficult. This thesis presents a hybrid computational pipeline that integrates supervised and unsupervised deep learning with classic computer vision approaches to address this challenge. For semantic segmentation, a U-Net architecture was trained on a dataset of manually annotated masks, enhanced by a sophisticated localized data augmentation strategy and a weighted loss function. In parallel, a Convolutional Autoencoder was employed for unsupervised clustering via K-Means to identify different flow regimes.
Finally, the pattern dynamics were quantified using an IoU-based tracking algorithm and a velocity field analysis with the Farnebäck method
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