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Surface normal guided method for two-dimensional phase unwrapping

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A novel phase unwraping method has been presented and evaluated in this paper. This method works by first constructing a quality map based on the characteristic of the active triangulation system from the wrapped phase data. The quality map is then used to guide the unwrapping. In order to reduce the execution time of phase unwrapping, we tessellate the whole wrapped phase map into blocks. Blocks with higher confidence will be unwrapped first. Experiment shows that this method can unwrap the wrapped phase map derived from the digital moiré system successfully. In data integration stage, only data with higher confidence will be reserved and used to merge together to form a complete 3D model.
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Keywords: Phase unwrapping; digital moiré; flood-fill; quality map

Document Type: Original Article

Affiliations: 1: Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 2: College of Precision Instrumentation and Optoelectronic Engineering, Tianjin University, 300072 Tianjin, China

Publication date: 2002-11-01

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