1. A. Mennucciy, S. Soatto, On observing shape from defocused images, Int. Conf. Image Anal. Process. (1999) 550–555.
2. F.S. Helmli, S. Scherer, Adaptive shape from focus with an error estimation in light microscopy, Second International Symposium on Image and Signal Processing and Analysis, 2001.
3. Shape from focus: an effective approach for rough surfaces;Nayar;International conference on Robotics and Automation,1990
4. Shape from focus;Nayar;IEEE Trans. Pattern Anal. Mach. Intell.,1994
5. Real time focus range sensors;Nayar;IEEE Trans. Pattern Anal. Mach. Intell.,1996