Three coding period gray scale trapezoid phase shift structured light three dimensional information obtaining method

A technology of encoding period, three-dimensional information, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of large amount of calculation, many projected coding patterns, no obvious improvement of sampling accuracy, etc., to improve the speed and expand the range of representation. , Improve the effect of anti-interference ability

Inactive Publication Date: 2015-01-07
HARBIN UNIV OF SCI & TECH
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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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  • Three coding period gray scale trapezoid phase shift structured light three dimensional information obtaining method
  • Three coding period gray scale trapezoid phase shift structured light three dimensional information obtaining method
  • Three coding period gray scale trapezoid phase shift structured light three dimensional information obtaining method

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[0029] Below in conjunction with accompanying drawing and specific embodiment the present invention will be further described:

[0030] The implementation of the method of the present invention requires a projection source, a fringe image acquisition device and a computer for control and calculation. It is used to measure the three-dimensional information of the sampled points on the surface of the measured object. The three-dimensional information of the sampled points includes, taking the optical center of the projection optical system of the projection source as the origin, the direction of the line connecting the origin and the optical center of the photographic optical system of the fringe image acquisition device as the X-axis direction, and the optical axis of the projection optical system of the projection source In the left-handed space coordinate system (world coordinate system) whose direction is the Z-axis direction, the distance x, y, z of the sampled point from t...

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Abstract

The invention provides a three coding period gray scale trapezoid phase shift structured light three dimensional information obtaining method. According to the method, three different coding periods are selected; an advantage of continuous dividing of a projection angle in a phase coding method is preserved and simultaneously, third coding period doubling is expanded for a measuring range of the phase coding method. And for a same coding period, three coding patterns that are moved by a one-third period are projected; therefore, anti-interference capability is improved; and meanwhile, influences of environmental illumination and inconsistency of surface reflection coefficients of a tested object on an obtained result of three dimensional information can be reduced. According to the invention, a phase shift coding structured light measuring range is improved; and a measuring error is reduced and measuring precision is improved; besides, influences of inconsistency of surface reflection coefficients of a tested object and environmental lighting on measurement can be eliminated.

Description

technical field [0001] The invention relates to a method for acquiring three-dimensional information, in particular to a technology for acquiring three-dimensional information of gray-scale trapezoidal phase-shift structured light with three encoding periods. 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 principle based on the image obtained from another angle through the imagin...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/24G01B11/25
Inventor 于晓洋王洋于双吴海滨于舒春陈德运
Owner HARBIN UNIV OF SCI & TECH
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