Three-dimensional shape measurement method and device based on double-angle single-frequency fringe projection
A technology of three-dimensional shape and fringe projection, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems that affect the reliability of measurement results, and the measurement results cannot be obtained in shadow areas on the surface of objects, etc., to achieve strong usability and practicality performance, avoid dead angles, and improve reliability
Active Publication Date: 2018-08-14
SHENZHEN INST OF ADVANCED TECH
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Problems solved by technology
[0004] However, most of the existing fringe projection measurement methods are only suitable for single-angle projection, but the shadow area on the surface of the object produced by single-angle projection cannot obtain measurement results, which affects the reliability of the measurement results
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[0024] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
[0025] In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.
[0026] see figure 1 , figure 1 It is a schematic diagram of projection fringe measurement provided by the prior art, which includes a projector and a camera. When there is no object to be measured, a digital light generated by the projector is reflected to the camera ...
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The present invention is applicable to the technical field of machine vision and provides a three-dimensional shape measuring method and device based on dual-angle single-frequency fringe projection. The method comprises a step of controlling two projector to project fringes with the same frequency to the surface of a measured object from different angles through a computer, a step of capturing the fringe images projected by the projectors through a camera, a step of calculating the phase map function of each angle fringe according to the captured fringe images, a step of carrying out phase unwrapping on the phase map function of each angle fringe through a space phase unwrapping method, and a step of carrying out data fusion according to the result of phase unwrapping and obtaining the three-dimensional shape data of the measured. Through the method and the device, the shadow area brought by single angle measurement can be eliminated, and the SNR of a measurement result is improved.
Description
technical field [0001] The invention belongs to the technical field of machine vision, and in particular relates to a three-dimensional shape measurement method and device based on dual-angle single-frequency fringe projection. Background technique [0002] Three-dimensional shape measurement technology has gradually become an important direction of information technology development. Due to its high measurement accuracy, the 3D shape measurement technology based on fringe projection has been widely used in industrial inspection, robot vision, medical treatment, security, and cultural relic protection. [0003] The basic principle of the three-dimensional shape measurement technology based on fringe projection is to project the sinusoidal fringe signal generated by the computer onto the object to be measured and the surface of the reference plane, and then use the camera to capture the deformed fringe image and the reference fringe image, and then analyze and process the fri...
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IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 程俊
Owner SHENZHEN INST OF ADVANCED TECH