A fast three-dimensional measurement method based on dual-frequency coding

A technology of three-dimensional measurement and dual-frequency coding, which is applied in the field of three-dimensional measurement, can solve problems such as the inability to use an odd number of pictures, achieve fast three-dimensional reconstruction effects, and suppress the interference of environmental noise

Active Publication Date: 2017-01-04
成都天拓众成科技有限公司
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Problems solved by technology

However, as mentioned in the article, in the process of using the lookup table, at least 6 pictures are required. The reason is that using the lookup table to generate structured light pictures using the coding method mentioned in the article cannot use an odd number of pictures. picture, get relevant phase information

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  • A fast three-dimensional measurement method based on dual-frequency coding
  • A fast three-dimensional measurement method based on dual-frequency coding
  • A fast three-dimensional measurement method based on dual-frequency coding

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Embodiment Construction

[0078] The present invention will be further explained below in conjunction with the drawings:

[0079] The fast three-dimensional measurement method based on dual-frequency coding of the present invention includes the following steps:

[0080] (1) Build a three-dimensional measurement system: place the target in the range that the camera can capture, and the light emitted by the projector can cover the scanning range;

[0081] (2) According to the following formulas (1)-(5), generate 5 structured light scanning patterns based on dual-frequency coding along the longitudinal encoding of the projector, or generate 5 structured light scanning patterns of dual-frequency encoding strategy along the horizontal encoding of the projector , Then the H and y in formulas (1)-(4) p Change to the width W of the projector resolution and the column x corresponding to the projector p :

[0082] I 0 p = A p + B 1 p s i n ( 2 πf h y p H ) + ...

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Abstract

The invention discloses a rapid three-dimensional measurement method based on double-frequency coding. The rapid three-dimensional measurement method includes the following steps that a three-dimensional measurement system is constructed; five structured light scanned patterns based on double-frequency coding are generated through longitudinal or transverse coding along a projector; the generated structured light scanned pictures are grabbed through a camera, the pictures which are grabbed through the camera and correspond to the coordinates (img file=' DDA0000464237580000011. TIF' wi=81' he='95' / ) are processed; high-frequency phases phi h are expanded by means of low-frequency phases phi u, and three-dimensional coordinates are calculated combined with the expanded phases. The double-frequency strategic coding mode is adopted, coded pictures simultaneously containing high frequency and low frequency can be generated, so that only the five pictures are needed to achieve real-time three-dimensional reconstruction, the rapider three-dimensional reconstruction effect is achieved, and interference of environmental noise can be effectively restrained.

Description

Technical field [0001] The invention relates to a three-dimensional measurement method, in particular to a fast three-dimensional measurement method based on dual-frequency coding. Background technique [0002] Structured light measurement technology is an optical three-position measurement technology with active stereo vision. Among them, the phase measurement technology has been the most widely used. It has the characteristics of non-contact, fast speed, high precision, wide working distance and wide application range of materials. It has been widely promoted in industrial inspection, cultural relic digitization and reverse engineering. Traditional phase measurement technology uses a single frequency encoding method, which only contains high frequency or fundamental frequency. During the measurement process, it is often necessary to combine patterns of high frequency encoding and fundamental frequency encoding at the same time to achieve better results. [0003] At present, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/00
Inventor 刘凯王帅军胡子阳
Owner 成都天拓众成科技有限公司
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