Dual-frequency phase multiplexing (DFPM) and period coded phase measuring (PCPM) pattern strategies in 3-D structured light systems, and lookup table (LUT) based data processing

摘要

A computer-implemented process, system, and computer-readable storage medium having stored thereon, program code and instructions for 3-D triangulation-based image acquisition of a contoured surface/object-of-interest under observation by at least one camera, by projecting onto the surface-of-interest 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;Inp=Ap+∑k=1K⁢Bkp⁢cos⁡(2⁢π⁢⁢fk⁢yp+2⁢π⁢⁢knN)Eq.⁢(1.1)
where Inp is the intensity of a pixel in the projector for nth projected image in a particular instant in time; K is an integer representing the number of component sinusoids (e.g., K=2 for a dual-frequency sinusoid pattern, K=3 for a triple-frequency sinusoid, each component sinusoid having a distinct temporal frequency, where K is ≦(N+1)/2.

主权项

1. A system for 3-D triangulation-based image acquisition of a surface-of-interest under observation by at least one camera, by projecting onto the surface-of-interest 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 satisfyInp=Ap+∑k=1K⁢⁢Bkp⁢cos(2⁢π⁢⁢fk⁢yp+2⁢π⁢⁢knN)where Inp is an intensity of a pixel in a projector for an nth projected image in a particular moment in time; K represents a number of component sinusoids comprising the first and second superimposed sinusoids, where K is less than or equal to (N+1)/2, the multi-frequency pattern comprising at least N projected patterns; a parameter Bkp represents constants for determining at least one parameter of each of said component sinusoids; Ap is a scalar; fk is a spatial frequency of a kth sinusoid corresponding with temporal frequency k; and yp represents a spatial coordinate in an image projected comprising the multi-frequency pattern.