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

A technology of encoding cycle and three-dimensional information, which is applied in the direction of measuring devices, instruments, and optical devices, etc., can solve the problems of numerous projected encoding patterns and large amount of calculation, expand the range of representation, avoid accumulated large errors, and improve anti-interference ability Effect

CN102494638BInactive Publication Date: 2014-06-11HARBIN UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2014-06-11
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[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 the three coordinate axes, or according to (x, y, z) and the necessary spatial analytic geometry calculation method , information ...