• Corpus ID: 238253318

Machine learning aided noise filtration and signalc lassification for CREDO experiment

@inproceedings{Bibrzycki2021MachineLA,
  title={Machine learning aided noise filtration and signalc lassification for CREDO experiment},
  author={Lukasz Bibrzycki and David E. Alvarez-Castillo and Olaf Bar and Dariusz G{\'o}ra and Piotr Homola and P'eter Kov'acs and Michal Nied'zwiecki and Marcin Piekarczyk and Krzysztof Rzecki and Jaroslaw Stasielak and Sławomir Stuglik and Oleksandr Sushchov and Arman Tursunov},
  year={2021}
}

• L. Bibrzycki, D. Alvarez-Castillo, +10 authors A. Tursunov
• Published 1 October 2021
• Physics, Engineering

The wealth of smartphone data collected by the Cosmic Ray Extremely Distributed Observatory (CREDO) greatly surpasses the capabilities of manual analysis. So, efficient means of rejecting the non-cosmic-ray noise and identification of signals attributable to extensive air showers are necessary. To address these problems we discuss a Convolutional Neural Network-based method of artefact rejection and complementary method of particle identification based on common statistical classifiers as well as their ensemble extensions. These approaches are based on supervised learning, so we need to provide a representative subset of the CREDO dataset for training and validation. According to this approach over 2300 images were chosen and manually labeled by 5 judges. The images were split into spot, track, worm (collectively named signals) and artefact classes. Then the preprocessing consisting of luminance summation of RGB channels (grayscaling) and background removal by adaptive thresholding was performed. For purposes of artefact rejection the binary CNN-based classifier was proposed which is able to distinguish between artefacts and signals. The classifier was fed with input data in the form of Daubechies wavelet transformed images. In the case of cosmic ray signal classification, the well-known feature-based classifiers were considered. As feature descriptors, we used Zernike moments with additional feature related to total image luminance. For the problem of artefact rejection, we obtained an accuracy of 99%. For the 4-class signal classification, the best performing classifiers achieved a recognition rate of 88%.