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Feature extraction. For each vowel, v, a patch I(v) is used to construct the features. f 1 gives the intensity variation inside I(v) and f 2…, f 16 represent the textural information. The final feature vector is ϕ(v). By its contribution ϕ(v) is 16 times the number of voxels in I(v). Note that I(v) is three‐dimensional. [Color figure can be viewed in the online issue, which is available at http://wileyonlinelibrary.com.]
