The repository contains pre-trained models using the segmentation-models-pytorch package to segment RGB images 416x416 pixels.
The resulting classes are "background," "matrix," "crack," and "pore".The purpose is a segmentation of test specimens made from building materials such as cement, alkali-activated materials or geopolymers.

The use is to segment cracks on test specimens or on images fully filled with a binder matrix containing cracks. The background should be darker than the speicmen itself. The segmentation is aimed at fine cracks from starting from 20 um up to 10 mm.

The background and matrix classes may sometimes be with, if the texture of specimens is too dark or smudged, it is, therefore, important to make a segmentation on possible clean specimens. The models of the current version have not been trained in exterior and may lead to bad segmentation. The pores are usually in circular shape, but there can be a situation where a crack is found on the edge of the pore. It is therefore recommended to avoid the usage of models on highly porous materials.

The models originate from https://github.com/qubvel-org/segmentation_models.pytorch library, and are retrained on dataset crackenpy_dataset.

The dataset for training can be downloaded from Brno University of Technology upon filling the form. The dataset is free for use in ressearch and education area under the BSD v2 license. The dataset was created under the research project of Grant Agency of Czech Republic No. 22-02098S with the title: "Experimental analysis of the shrinkage, creep and cracking mechanism of the materials based on the alkali-activated slag".

The training was done using Pytorch library, where CrossEntropyLoss() together with AdamW optimizer function.

The dataset has 1207 images in resolution of 416x416 pixels together with 1207 masks. The overall accuracy of training for all classes reaches 98%, the mean intersection of union reaches 73%.

The training was done using NVIDIA Quadro P4000 with CUDA support.

The models were trained using Pytorch in Python, the segmentation and dataset preparation was done using LabKit plugin in software FIJI.

Richard Dvorak, Brno University of Technology, Faculty of Civil Engineering, Institute of building testing

Rostislav Krc, Brno University of Technology, Faculty of Civil Engineering, Institute of building testing

Vlastimil Bilek, Brno University of Technology, Faculty of Chemistry, Institute of material chemistry

Barbara Kucharczyková, Brno University of Technology, Faculty of Civil Engineering, Institute of building testing

The model was trained on the CrackenPy Dataset, and is used in CrackenPy library:

If you use this model, please cite our work:

The author of the dataset is Richard Dvorak Ph.D., richard.dvorak@vutbr.cz, tel.: +420 777 678 613, employee of Brno University Of Technology of the Faculty of Civil Engineering, institute of building testing.