Automatic seizure detection based on kernel robust probabilistic collaborative representation
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Visual inspection of electroencephalogram (EEG) recordings for epilepsy diagnosis is very time-consuming. Therefore, much research is devoted to developing a computer-assisted diagnostic system to relieve the workload of neurologists. In this study, a kernel version of the robust probabilistic collaborative representation-based classifier (R-ProCRC) is proposed for the detection of epileptic EEG signals. The kernel R-ProCRC jointly maximizes the likelihood that a test EEG sample belongs to each of the two classes (seizure and non-seizure), and uses the kernel function method to map the EEG samples into the higher dimensional space to relieve the problem that they are linearly non-separable in the original space. The wavelet transform with five scales is first employed to process the raw EEG signals. Next, the test EEG samples are collaboratively represented on the training sets by the kernel R-ProCRC and they are categorized by checking which class has the maximum likelihood. Finally, post-processing is deployed to reduce misjudgment and acquire more stable results. This method is evaluated on two EEG databases and yields an accuracy of 99.3% for interictal and ictal EEGs on the Bonn database. In addition, the average sensitivity of 97.48% and specificity of 96.81% are achieved from the Freiburg database.
KeywordsEEG Seizure detection Probabilistic collaborative representation Kernel function method
This work was jointly financially supported by the National Natural Science Foundation of China (No. 61501283, No. 61701279, No. 61701270 and No. 61401259), the Shandong Provincial Natural Science Foundation (No. ZR2015PF012 and No. ZR2017PF006), and the China Postdoctoral Science Foundation (No. 2015 M582129 and No. 2015 M582128).
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