Surface profile measurement using color fringe projection

A novel method for noncontact visual measurement of the profile of surfaces is described. Sinusoidal color fringe patterns are projected onto the surface to be measured, which is then viewed with a color camera. From examination of the red, green, and blue components of a single color image the depth at each point on the surface is determined from the calculation of relative phase shifts.A description of the system is given together with experimental results. The system has been tested for several objects with neutral colored surfaces, including the measurement of three-dimensional profiles of turbine blades.

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