Superpixel segmentations for thin sections: evaluation of methods to enable the generation of machine learning training data sets

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Authors

Jiaxin Yu , Florian Wellmann , Simon Virgo , Marven von Domarus, Mingze Jiang, Joyce Schmatz, Bastian Leibe 

Abstract

Training data is the backbone of developing either Machine Learning (ML) models or specific deep learning algorithms. The paucity of well-labeled training image data has significantly impeded the applications of ML-based approaches, especially the development of novel Deep Learning (DL) methods like Convolutional Neural Networks (CNNs) in mineral thin section images identification. However, image annotation, especially pixel-wise annotation is always a costly process. Manually creating dense semantic labels for rock thin section images has been long considered as an unprecedented challenge in view of the ubiquitous variety and complexity of minerals in thin sections. To speed up the annotation, we propose a human-computer collaborative pipeline in which superpixel segmentation is used as a boundary extractor to avoid hand delineation of instances boundaries. The pipeline consists of two steps: superpixel segmentation using MultiSLIC, and superpixel labeling through a specific-designed tool. We use a cutting-edge methodology Virtual Petroscopy (ViP) for automatic image acquisition. Bentheimer sandstone sample is used to conduct performance testing of the pipeline. Three standard error metrics are used to evaluate the performance of MultiSLIC. The result indicates that MultiSLIC is able to extract compact superpixels with satisfying boundary adherence given multiple input images. According to our test results, large and complex thin section images with pixel-wisely accurate labels can be annotated with the labeling tool more efficiently than in a conventional, purely manual work, and generate data of high quality.

DOI

https://doi.org/10.31223/X55S65

Subjects

Earth Sciences, Physical Sciences and Mathematics

Keywords

Mineral thin section images, Pixel-wise labeling, Image annotation, Superpixel segmentation

Dates

Published: 2021-10-16 09:33

Last Updated: 2021-10-16 16:33

License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
None

Data Availability (Reason not available):
Code and data are available, this is specified in the paper.

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