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KMID : 0361920110410020076
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Korean Journal of Orthodontics
2011 Volume.41 No. 2 p.76 ~ p.86
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Influence of the angles and number of scans on the accuracy of 3D laser scanning
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Lee Kyung-Min
Song Hyo-Young
Lee Ki-Heon
Hwang Hye-Nam
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Abstract
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Objective : To investigate whether the accuracy of 3D laser scanning is influenced by the angles and number of scans.
Methods: Using a 3D laser scanner, 10 manikins with facial markers were scanned at 7 horizontal angles (front view and at 20o, 45o, and 60o angles on the right and left sides). Three-dimensional facial images were reconstructed by 6 methods differing in the number and angles of scans, and measurements of these images were compared to the physical measurements from the manikins.
Results: The laser scan images were magnified by 0.14 - 0.26%. For images reconstructed by merging 2 scans, excluding the front view; and by merging 3 scans, including the front view and scans obtained at 20° on both sides; several measurements were significantly different than the physical measurements. However, for images reconstructed by merging 3 scans, including the front view; and 5 scans, including the front view and scans obtained at 20o and 60o on both sides; only 1 measurement was significantly different.
Conclusions : These results suggest that the number and angle of scans influence the accuracy of 3D laser scanning. A minimum of 3 scans, including the front view and scans obtained at more than 45o on both sides, should be integrated to obtain accurate 3D facial images.
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KEYWORD
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3D laser scanner, Scan angle, Number of scans
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