I. Introduction
A HIGH-SPEED and high-resolution three-dimensional (3-D) imaging system has a wide variety of applications including gesture recognition, depth-key object extraction, position adjustment, computer vision and security systems. In recent years, we have often seen 3-D computer graphics in movies and televisions and handled them interactively using personal computers and video game machines. Moreover, ultra-high-speed range finding provides the possibility of additional applications such as shape measurement of structural deformation and destruction, quick inspection of industrial components, observation of high-speed moving objects, and fast visual feedback systems in robot vision.