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The classification accuracy and runtime of recognizing one VOI (except feature extraction) of SR2 (K-Means+OMP) and SR3 (K-Means+OMP1). The patch size was 3 × 3 × 3 and the number of nonzero atoms was 3000. Replacement of the OMP by the OMP1 can reduce the runtime of the method and achieve good performance when the value of the sparsity is small.
