(3) S. Beucher and F. Mayer,“The Morphological Approach to Segmentation: The Watershed Transformation,” Mathematics of Morphology in Image Processing, pp. 433-482, E. R. Dougherty, ed. , Marchel Dekker, New York 1993
(5) K. Okazaki, H. Mitsumoto, S. Tamura, H. Kawai, K. Kani, H. Taketani and Y. Fukui,“Contour Extraction and Complement of Corneal Endothelial Cell Using Energy Function,”Proceedings of First KOREA-JAPAN Joint Conference on Computer Vision, pp. 495-499, 1991