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(a) Type I evaluation of each texture method at different levels of B-spline distortion degree at 2, 4, 8 and 16 at 20× magnification under focal plane with even illumination; (b) Type II evaluation of each texture method at different levels of B-spline distortion degree at 2, 4, 8 and 16 at 20× magnification under focal plane with even illumination
