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(A) Acquisition of face models (Face_A by 3dMD scanner, Face_B by FaceScan scanner, Face_R by Faro scanner); (B) Registration of reference and test models (green: Faro model, yellow: FaceScan model, purple: 3dMD model); (C) Trimming superimposed models by the same boundary and dividing into upper, middle, and lower parts. (D) 3D comparison between reference and test models in 3D error for partial and global accuracy of the test facial scanners.
