Method for obtaining three-primary-color triangular phase shift three-dimensional information based on three encoding periods

Abstract

The invention provides a method for obtaining three-primary-color triangular phase shift three-dimensional information based on three encoding periods. According to the method disclosed by the invention, the advantage of using a phase encoding method for continuously dividing a projection angle is kept while the measurement range of the phase encoding method is widened by times of the a third encoding period by selecting different encoding periods of three primary color spaces. The invention provides the technology for obtaining three-dimensional information through three-primary-color triangular phase shift sampling points based on the three encoding periods, so that the light measurement range of a phase shift encoding structure can be enlarged, the measurement error is reduced, the measurement precision is improved, and the influences on the measurement, which are brought about by the different reflection coefficients of the surface of an object to be measured and the environment illumination, are overcome.

Description

technical field [0001] The invention relates to a three-dimensional information acquisition method, in particular to a three-dimensional information acquisition technology of phase-shift structured light sampling points with mutually prime three-primary-color coding periods and symmetrically distributed primary-color levels. Background technique [0002] A large number of optical non-contact three-dimensional information acquisition technologies are widely used in modern industrial and agricultural production processes, among which structured light technology is widely used in reverse engineering, archaeology, In fields such as medicine, clothing, anthropometry, etc., it is necessary to restore the three-dimensional shape of the object. Structured light technology uses ordinary or laser as a light source to project a known pattern onto the surface of the object to be measured, and obtains three-dimensional information of the sampling point by using the triangulation principl...

AI Technical Summary

Problems solved by technology

[0006]Da Yanqiuyi was introduced into continuous sinusoidal coding structured light decoding. The current coding method uses two coding frequencies to sample the measured object. In addition to solving In addition to the congruence equation, it is also necessary to query the pre-calibrated error table for correction. The sampling accuracy of this type of technology has not been significantly improved.

[0007]The three-period sinusoidal encoding method is also used to unwrap the sinusoidal phase shift, but this method inevitably has a large amount of calculation in the sinusoidal phase shift method, and the projection encoding The problem with many patterns

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