This paper introduces a non contact 3-D range image measurement system using a structured light system. By means of a LCD projector

eight stripe patterns encoded the measured space into 253 sections. A CCD camera sequentially recorded eight gray images corresponding to the eight patterns

respectively. The range data of the object surface is demodulated using the pixel based triangulation. This paper also introduces a software to produce highly efficient binary spatial coding patterns. The error caused by projector lens distortion and camera lens distortion are analyzed

and the error formulae to rectify the error of radial lens distortion is set up in order to obtain a good measured resolution. As a pixel based evaluation method

range data being got from only a single pixel

it can be used in measuring sharply discontinuous surfaces

and works smoothly in a less structured environment.