Mr. Hideharu Yanagi Profile

Hideharu Yanagi

at Tokyo Denki Univ

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Proceedings Article | 4 September 2009 Paper

Performance evaluation of macro lens in digital close range photogrammetry

H. Yanagi, H. Chikatsu

Proceedings Volume 7447, 74470J (2009) https://doi.org/10.1117/12.825817

KEYWORDS: Zoom lenses, Cameras, Cultural heritage, Calibration, Photogrammetry, Digital photography, 3D modeling, Visualization, 3D metrology, Robot vision

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Recently, the documentation and visualization of various cultural heritages have been receiving attention, and a small Buddha such as less than 10 cm tall which was stored in the womb of Buddha is also included in cultural heritages. Zoom lenses are generally used to document these small objects and thus conserve the cultural heritage. However, there exist certain issues pertaining to the use of zoom lenses for such digital documentation. These issues include image sharpness and distortions that occur with changes in focal length setting, and in particular, the depth of field is issue from application standpoint such as documentation of the small cultural heritage. On the other hand, macro lenses can be used to capture sharp images of small objects from the view point of working distance, and its depth of field is related to the aperture of the camera. In order to evaluate the effectiveness of macro lenses in digital close range photogrammetry, macro lens and zoom lens were mounted on a digital single lens reflex camera (Canon EOS20D, 8.2 Mega pixels). This paper deals in a first part with comparative evaluations for both lenses with respect to their lens distortion, imaging mode, and calibration aspects. The results indicated that macro lenses were more suitable for digital close range photogrammetry. Calibration tests are performed to demonstrate the effectiveness and practicability of macro lens in close range photogrammetic applications.

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