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

Abstract

The invention provides a method for obtaining three-primary-color trapezoidal 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 a third encoding period by selecting different encoding periods of three primary color spaces; and furthermore, not only can the anti-interference capacity be improved, but also the influences on a three-dimensional information obtaining result, which are caused by the environment illumination and the different reflection coefficients of the surface of an object to be measured, are reduced by projecting three encoding patterns which are shifted for 1 / 3 period for the same primary color space. According to the method disclosed by the invention, the light measurement range of a phase shift encoding structure can be improved, the measurement error is reduced, the measurement precision is improved, and the influences of the measurement, which are brought about by the different reflection coefficients of the surface of the 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 in which the coding periods of the three primary colors are mutually prime and the levels of the primary colors are distributed in a trapezoid. 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 poin...

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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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