Phase error compensation method in fringe projection three-dimensional measurement
A technology for phase error and three-dimensional measurement, which is applied to measuring devices, instruments, and optical devices, etc., can solve problems such as complex process and low compensation efficiency, and achieve the effects of improving efficiency, accurate phase value, and avoiding motion errors
Pending Publication Date: 2022-07-01
HEBEI UNIV OF ENG
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[0004] The purpose of the present invention is to provide a phase error compensation method in fringe projection three-dimensional measurement for the problems of low compensation efficiency and complicated process in the prior art
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[0037] The embodiments of the present invention will be clearly and completely described below in conjunction with the specific embodiments involved in the accompanying drawings. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, such as embodiments that only change the usage without changing the basic principles involved in the claims, fall within the protection scope of the present invention.
[0038] First of all, the phase error compensation method of the present invention is based on fringe projection measurement, and proposes multiple initial phase error compensation, which requires a computer to generate fringe images with different initial phase values, such as figure 2 As shown in the figure, the phase distribution of fringe images with different initial phases is obtained by the phase...
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The invention discloses a phase error compensation method in fringe projection three-dimensional measurement, and the method comprises the steps: generating three groups of different initial phase fringe images through a computer, projecting the images to the surface of a measured object through a projector, and collecting deformed fringe images through a camera; adopting a four-step phase shift algorithm to extract phase information, and calculating to obtain wrapped phase diagram data containing phase errors; according to the periodicity of phase errors, selecting a specific threshold value K for phase values in the three wrapped phase diagrams by taking pixel positions as a set; phase values in the wrapped phase diagram are accepted and rejected by using a given threshold value, pixel points are traversed, wrapped phase data are fused and calculated to correct original phase values, and phase distribution after phase error compensation is obtained. According to the invention, a simple operation process is adopted, and phase error compensation of fringe projection three-dimensional measurement is effectively realized.
Description
technical field [0001] The invention relates to the technical field of fringe projection three-dimensional measurement, in particular to a phase error compensation method in fringe projection three-dimensional measurement. Background technique [0002] At present, fringe projection 3D measurement technology has developed rapidly and has the advantages of non-contact, high precision, and wide applicability. It is not only suitable for industrial inspection, reverse engineering, target recognition, etc. gradually appear. Fringe projection 3D measurement is a kind of active 3D measurement, and fringe projection is more widely used as surface structured light 3D measurement. The fringe projection 3D measurement technology projects the fringe images generated by the computer to the surface of the object to be measured in turn through the projector. At the same time, the camera obtains the deformed fringe image that is highly modulated by the measured object, obtains the phase in...
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Login to View More IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 邓文爽张雷李浩天
Owner HEBEI UNIV OF ENG