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Lookup NU author(s): Professor Gui Yun TianORCiD
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Errors due to magnification variations are caused in optical systems when three-dimensional shape measurements based on depth-from-focus (DFF) are performed. These magnification variations cause focus measures to be incorrectly interpreted. In this paper, a DFF-based system which considers the magnification variations has been developed to undertake accurate measurements of surface morphology with depth discontinuity. The image magnification can be represented by magnification factors, which are computed using the ratio of diagonal image lengths of a rectangular calibration block, according to optical system movements. The image calibration is performed using the magnification factors. The calibration makes the image size of the object features identical, in spite of magnification variations resulting from optical system movements. Therefore, the application of accurate and reliable focus measures is made in the calibrated images. The performance of our presented system has been verified through experiments with actual objects with depth discontinuity. © 2008 Springer-Verlag London Limited.
Author(s): Kim GB, Tian GY
Publication type: Article
Publication status: Published
Journal: The International Journal of Advanced Manufacturing Technology
Print publication date: 01/02/2009
ISSN (print): 0268-3768
ISSN (electronic): 1433-3015
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