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A three-dimensional measurement method and system

A three-dimensional measurement and color technology, applied in measuring devices, instruments, optical devices, etc., can solve the problems of easy period dislocation in decoding, difficulty in determining the order of stripes, and reduced measurement accuracy, so as to reduce the amount of calculation and speed up the processing , Strong anti-interference ability

Active Publication Date: 2020-04-28
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0004] At present, the three-dimensional measurement method of structured light based on gray-scale time coding in the prior art has the disadvantages of large number of projections and slow measurement speed. However, in the color-coded measurement method with few projections, the method based on color trapezoidal phase shift plus Gray code or When the method of sinusoidal phase shift plus Gray code requires high spatial resolution, the number of stripes increases, and the number of color Gray code patterns of the same primary color also increases, and it becomes difficult to judge the gray code corresponding to the stripe level, and it is difficult to decode. Prone to problems such as period dislocation, resulting in reduced measurement accuracy

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  • A three-dimensional measurement method and system

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Embodiment 1

[0064] Please refer to the attached figure 1 , is a schematic flow chart of a three-dimensional measurement method provided in Embodiment 1 of the present invention. The method is suitable for dynamic three-dimensional measurement scenes with slow moving speeds. The method is executed by a three-dimensional measurement system, which can be implemented by software and / or hardware accomplish. The method specifically includes the following steps:

[0065] S101. Using the RGB three color channels of the image, respectively perform grayscale encoding on each channel to generate a color trapezoidal phase shift fringe pattern and a color ladder phase encoding fringe pattern.

[0066] The present invention integrates the three-dimensional measurement method of the color trapezoidal phase shift fringe and the color (segmented) step phase encoding fringe, and utilizes the coding principle of the color trapezoidal phase shifting fringe, the coding principle of the color step phase fring...

Embodiment 2

[0131] Please refer to the attached figure 2 , is a schematic structural diagram of a three-dimensional measurement system provided in Embodiment 2 of the present invention, and the system is suitable for implementing the three-dimensional measurement method provided in the embodiment of the present invention. The system specifically includes the following modules:

[0132] The pattern generating module 21 is used to utilize the RGB three color channels of the image to carry out gray-scale coding on each channel respectively, so as to generate a color trapezoidal phase shift fringe pattern and a color ladder phase coding fringe pattern;

[0133] The first projection module 22 is configured to sequentially project the color trapezoidal phase shift fringe pattern and the color ladder phase encoding fringe pattern to the reference plane to obtain a first group of projection patterns, the first group of projection patterns includes The color trapezoidal phase shift fringe projec...

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Abstract

The embodiment of the invention discloses a three-dimensional measurement method and system. Based on a principle of color step phase encoding stripe auxiliary color trapezoid phase shift stripe decoding, a triangle principle is employed to achieve that two color patterns are employed to complete three-dimensional measurement so as to effectively reduce the number of projection patterns, reduce the calculated amount and speed up the processing speed, and the three-dimensional measurement method and system are not sensitive to the camera noise and the ambient light, is high in anti-jamming capability and improves the measurement precision.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of three-dimensional optical measurement, and in particular, to a three-dimensional measurement method and system. Background technique [0002] Structured light measurement technology has the advantages of non-contact, full-field lossless measurement, high precision, and fast speed. It has been widely used in industrial inspection, machine vision, digitalization of cultural relics, and medicine. Among the existing structured light measurement systems, the structured light 3D measurement system consisting of a camera and a projector is widely used because of its simple structure and high efficiency of point cloud reconstruction. In a typical single-camera structured light 3D measurement system, the projection device projects the coded fringe pattern onto the surface of the measured object during the measurement process. The image is processed, and the phase information representing the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/25
CPCG01B11/2509
Inventor 高健周浩源胡浩晖罗瑞荣陈新汤晖陈云贺云波
Owner GUANGDONG UNIV OF TECH
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