Visible fingerprint of X-ray images of epoxy resins using singular value decomposition of deep learning features

Edgar Avalos, Kazuto Akagi, Yasumasa Nishiura

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Although the process variables of epoxy resins alter their mechanical properties, recently it was found that the total variation of the X-ray images of these resins is one of the key features that affect the toughness of these materials. However it is still not clear how to visualize such a difference in a clear way. To facilitate the visualization, we use a robust approximation of the gradient of the intensity field of the X-ray images of different kinds of epoxy resins and then we use deep learning to discover the most representative features of the transformed images. In this solution of the inverse problem to find characteristic features to discriminate samples of heterogeneous materials, we use the eigenvectors obtained from the singular value decomposition of all the channels of the response maps of the early layers in a convolutional neural network. While the strongest activated channel gives a visual representation of the characteristic features, often these are not robust enough in some practical settings. On the other hand, the left singular vectors of the matrix decomposition of the response maps barely change when variables such as the capacity of the network or the network architecture change. High classification accuracy and robustness of characteristic features are presented in this work.

Original languageEnglish
Article number109996
JournalComputational Materials Science
Publication statusPublished - 2021 Jan


  • Computer vision
  • Convolutional neural network
  • Deep learning
  • Epoxy resin
  • Structure-property mapping
  • X-ray CT scan


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