An important step of phase calculation-based fringe projection\udsystems is 3D calibration, which builds up the relationship between an\udabsolute phase map and 3D shape data. The existing 3D calibration\udmethods are complicated and hard to implement in practical environments\uddue to the requirement of a precise translating stage or gauge block. This\udpaper presents a 3D calibration method which uses a white plate with\uddiscrete markers on the surface. Placing the plate at several random\udpositions can determine the relationship of absolute phase and depth, as\udwell as pixel position and X, Y coordinates. Experimental results and\udperformance evaluations show that the proposed calibration method can\udeasily build up the relationship between absolute phase map and 3D shape\uddata in a simple, flexible and automatic way.
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