1. Blazquez, C.H.: Computer-Based Image Analysis and Tree Counting with Aerial Color Infrared Photography. Journal of Imaging Technology 15(4), 163–168 (1989)
2. Brandtberg, T., Walter, F.: Automated delineation of individual tree crown in high spatial resolution aerial images by multiple-scale analysis. Machine Vision and Applications 11, 64–73 (1998)
3. Firestone, L., Rupert, S., Olson, J., Mueller, W.: Automated Feature Extraction: The Key to Future Productivity. Photogrammetric Engineering and Remote Sensing 62(6), 671–674 (1996)
4. Gonzalez, R.C., Woods, R.E.: Digital image processing. Addison-Wesley, Reading, Mass (1987)
5. Butt, M.A., Maragos, P.: Optimal design of chamfer distance transforms. IEEE Transactions on Image Processing 7, 1477–1484 (1998)