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Analysing and evaluating a dual sensor autofocusing method for measuring the position of patterns of small holes on complex curved surfaces

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Figure

Fig. 2.  Focusing curves based on image DCT evaluation function for a hole on an elliptic cylinder shell under different illuminating light intensity (LI) and a hardness indentation on a flat workpiece
Fig. 3. Dual-sensor autofocusing configurations with (a) parallel and (b) perpendicular to each other, where L=L0
Fig. 4. Schematic of a tactile probe contacting a small hole on the protruding part of a complex-curved cylinder
Fig. 7. Focusing deviations versus slope of the higher edge of small hole on complex-curved surface f (x,y) (∆l = r =      0.25 mm)
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