Structured Light 3-D Measurement Module and System for Illuminating a Subject-under-test in Relative Linear Motion with a Fixed-pattern Optic

摘要

A surface measurement module for 3-D triangulation-based image acquisition of a subject-under-inspection and under observation by at least one camera. The module having: (a) casing housing an optical system comprising a plurality of lens elements positioned between a fixed-pattern optic and a light source; (b) an output of said fixed-pattern optic comprising a multi-frequency pattern comprising a plurality of pixels representing at least a first and second superimposed sinusoid projected simultaneously, each of the sinusoids represented by the pixels having a unique temporal frequency and each of the pixels projected to satisfy I n p = A p + ∑ k = 1 K  B k p  cos  ( 2   &pgr;   f k  y p + 2   &pgr;   kn N ) Eq .  ( 1.1 ) (c) the subject-under-inspection and fixed-pattern optic in relative linear motion during projection onto the subject-under-inspection of the output of the fixed-pattern optic; and (d) plurality of images captured of this output during projection onto the subject-under-inspection are used for the image acquisition.