Ice-Core Micro-CT Image Segmentation With Deep Learning and Gaussian Mixture Model

Abstract

Ice cores of polar regions (ice sheets) are one of the most prominent natural archives that can reveal essential historical information from the past environment of our planet. The ice core microstructure is a key feature in determining the principal properties of ice such as pore close-off, albedo, and melt events. Micro-CT scans can provide valuable information about the microstructure of materials, although achieving a highquality automated segmentation of porous materials, especially with phase/density changes is still a challenge. This work proposes a new method for improving the segmentation of porous microstructures where a weak segmentation (Gaussian Mixture Model) on high-resolution (30 µm) data is used as ground truth to train a deep learning model (U-net) for segmentation of low-resolution (60 µm) data. This approach has reached high segmentation accuracy in terms of quantitative metrics having the F1-score of 92.5% and an intersection over the union of 91%, with a considerable improvement compared to thresholding and unsupervised methods. Also, the segmentation results of U-net are closer to the real weight, density, and specific surface area of the specimen.

Ice-Core Micro-CT Image Segmentation with Dual Stream Spectrum Deconvolution Neural Network and Gaussian Mixture Model

“…Numerous investigation studies were presented in the literature linked to deep learning depend ICMCTS, some current works are reviewed here, Bagherzadeh, et al [22] have suggested ICMCTS with DL and GMM. Here, presents new method to enhance segmentation of porous microstructures: DL method (U-net) was trained on higher-resolution (30 µm) data using weak segmentation [GMM] as ground truth, in order to segment low-resolution (60 µm) data.…”

“…It is one indicator of ML method's performance the quality ofpositive prediction made by method. It refers to number of true positives divided by total positive predictions as given in equation (22).…”