1. a University of Dayton, Department of Electrical Engineering, 300 College Park, Dayton, OH 45469-0226, USA
2. b Optical Image Processing Laboratory, The Bradley Department of Electrical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
3. c Hamamatsu Corporation, Bridgewater, NJ 08807, USA
4. d Hamamatsu Photonics K.K., Hamamatsu City, Japan