Abstract
In this paper, a method for determining the position of an object in a 3-dimensional space is proposed. An M-array LED pattern is projected onto the object through a lens and the projected array is observed with a CCD camera. Each element of the M-array is time modulated with an M-sequence having different phase. The crosscorrelation function between the observed signal and the reference gives us the information about the phase, and thus the point-to-point correspondence. Then simple trigonometric relations are used to determine the exact 3-dimensional position of the object. The proposed method is robust to noise and highly efficient.
