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Extraction of 3D Haar-like features. The gray cubic indicated a patch R centered at x. (a) If b = 0, a Haar-like feature is computed as the local mean intensity of any randomly displaced cubical region R1 within the image patch R. (b) If b = 1, a Haar-like feature is computed as the mean intensity difference over any two randomly displaced, asymmetric cubical regions (R1 and R2) within the image patch R.
