Phase unwrapping method and device

Abstract

The invention provides a phase unwrapping method and device, and the method comprises the steps: obtaining a first picture sequence obtained when a generated measurement fringe sequence is projected to the surface of an object, carrying out processing of the first picture sequence, and obtaining a first average intensity diagram and a wrapped phase diagram; obtaining a second picture sequence obtained when the generated composite stripe sequence is projected to the surface of the object, and obtaining a phase coding stripe order and a gray coding stripe order of the object based on a coding phase diagram, a second average intensity diagram and an intensity modulation diagram obtained by processing the second picture sequence; and processing the wrapped phase diagram based on the gray coding stripe order and the phase coding stripe order to obtain a standard absolute phase diagram used for performing three-dimensional construction on the object. According to the invention, phase code words and gray code words are embedded from an intensity domain and a phase domain, the limitation of the number of traditional phase coding code words is broken through, and the obtained standard absolute phase diagram can be used for constructing a high-precision three-dimensional model of an object.

Description

technical field [0001] The invention relates to the technical field of optical three-dimensional measurement, in particular to a phase unwrapping method and device. Background technique [0002] At present, optical three-dimensional measurement technology has begun to be widely used in various fields such as virtual reality, cultural relics protection, mechanical processing, and film and television special effects production. Among them, one of the key technologies of optical three-dimensional measurement technology is phase unwrapping technology. Using phase unwrapping technology The continuous phase distribution of the object can be obtained when the optical three-dimensional measurement technology is used. The continuous phase distribution of the object directly affects the accuracy of the three-dimensional construction of the object. Therefore, the phase unwrapping technology has become a popular research direction for researchers. [0003] Phase unwrapping techniques ar...

AI Technical Summary

Problems solved by technology

The phase encoding method belongs to the category of time-domain unwrapping. The codeword is embedded in the periodic cosine stripes in the form of phase, which is insensitive to ambient light, camera noise and surface contrast. However, the traditional phase encoding method is not perfect. However, due to factors such as projector nonlinearity and ambiguity, the number of codewords is limited and there are misalignment defects between the package phase and codewords

Therefore, the method based on phase encoding is prone to errors in unwrapping the high-frequency wrapping phase, which has certain limitations, which affects the high-precision 3D reconstruction of objects.

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