1. Nakatani, H., Abe, K., Miyakawa, A., Terakawa, S.: Three-dimensional measurement endoscope system with virtual rulers. Journal of Biomedical Optics 12(5), 051803-05–051803-06 (2007)
2. Mourgues, F.: Devernay, F.: 3d reconstruction of the operating field for image overlay in 3d-endoscopic surgery. In: Proceedings of the IEEE and ACM International Symposium on Augmented Reality (ISAR), pp. 191–192. IEEE and ACM (2001)
3. Thormaehlen, T., Broszio, H.: Threedimensional endoscopy. In: Falk Symposium, Falk, pp. 199–212 (2001)
4. Horn, B.K.: Obtaining shape from shading information. In: Psychology of Computer Vision, Winston, pp. 115–155. McGraw-Hill (1975)
5. Woodham, R.J.: Photometric method for determining surface orientation from multiple images. Optical Engineering 19(1), 139–144 (1980)