This paper consists of two chapters. In chapter 1, researches on depth measurement methods for 3-D objects using active illuminations are reviewed. Many techniques are described and discussed. In chapter 2, a new technique for high speed ranging system is mentioned. The system has a specially developed sensing device. This technique enables a real-time 3-D shape measurement.

Keywords: 3-D object measurement, range finder, active illumination, structured lighting

Received December 15, 1989; revised June 15, 1990.
Communicated by Jun S. Huang.