近接デジタル写真測量におけるマクロレンズの有効性について

摘要

Recently, documentation and visualization of various cultural heritages have been receiving attention, and small Buddha such as less than 10 cm tall which was stored in the womb of Buddha is also included in cultural heritages. In order to document these small objects in conservation of cultural heritage, zoom lenses are generally used. However, there are still issues for digital documentation of these small objects using zoom lenses. These problems include sharp imaging and distortions which occur with changes in focal length setting. On the other hand, macro lenses have ability in sharp imaging of small objects from the view point of working distance.rnWith this motive, zoom and macro lens was mounted on digital single lens reflect camera, and accuracy and performance evaluations of the both lenses were investigated in this paper.%本研究ではズームレンズとの比較の下にマクロレンrnズによる近接デジタル写真測量の可能性および実用性rnについて検討を行った。その主な結果を表4に示す。rn以上表4の結果より，ズームレンズは広角撮影からrn望遠撮影まで幅広く対応できる特徴を持ち，レンズ歪rnみはマクロレンズより大きいものの撮影モードの選びrn方によってはマクロレンズに匹敵する計測精度が得らrnれることが確認されたが，胎内像のような小物体の近rn接デジタル写真測量における課題である影の影響などrnの照明条件，ワーキングディスタンスおよびカメラrnキャリブレーションの安定性においてマクロレンズのrn有効性が示された。