Abstract
In this paper, we provide a technique using a hologram as a diffractive element for finding the absolute shape of an object with large depth discontinuities. The proposed method offers following major advantages: (1) a large depth-of-field in the projection system, (2) very low fringe distortion (even for a large field of view), (3) only one phase measurement needed for operation, (4) easiness for calibration, (5) robust performance to analyze surfaces with lots of discontinuities, especially for automatic phase unwrapping, and (6) a very compact design for the measurement system. The single-shot property also makes it possible for measurements of dynamic objects with large depth discontinuities.
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