S. Ohno and S. Komatsu: Image Restoration and Object Distance Evaluation from a Defocused Photon Image, Extended Abstracts (Optics Japan 2000) , The Optical Society of Japan, 41-42.

In our laboratory the filter bank method has been developed, which enables to extract the defocus amount from a defocused image which can be imaged only with a photon counting camera. Experimental results show the information of the defocus amount is extracted and the original object is successfully restored.