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Time domain and space domain hybrid coding based structured light fringe projection method

A technology of structured light stripes and hybrid coding, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of complex coding process and difficulty in extracting sub-pixel coordinates of stripes, and achieve the effect of good technical advantages.

Inactive Publication Date: 2017-05-10
TIANJIN UNIV
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Problems solved by technology

However, this method is difficult to extract sub-pixel coordinates of stripes, and there are many constraints between stripes, so the encoding process is more complicated

Method used

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  • Time domain and space domain hybrid coding based structured light fringe projection method
  • Time domain and space domain hybrid coding based structured light fringe projection method
  • Time domain and space domain hybrid coding based structured light fringe projection method

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Embodiment Construction

[0036] The technical scheme that the present invention adopts is,

[0037] 1. Stripe Coding Rules

[0038] The present invention designs a fringe projection encoding method. This fringe projection method uses a projector to project three images for each measurement, and performs image processing to obtain the fringe center coordinates and corresponding encoding values ​​of each cycle, which are used to establish a projector. Correspondence between cameras.

[0039] In order to simplify the expression of the variation of the fringe pattern with time, the encoding method in the time domain of the present invention is expressed in decimal notation. There are six encoding situations of 001, 010, 011, 100, 101, and 110 in the projected fringes of a single period as time changes, that is, six encoding values ​​of 1, 2, 3, 4, 5, and 6. Here, 001 means that the stripe code value of the first image and the second image projected by the projector is 0, and the code value of the corres...

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Abstract

The invention relates to a structured light projection fringe coding method in a vision inspection technology. In order to enable a structured light measuring method to have the advantages of simple coding principle, high measurement speed, high robustness and ability of enabling an acquired result to have sub-pixel precision and the like, the invention adopts the technical scheme that the time domain and space domain hybrid coding based structured light fringe projection method comprises the steps of coding projection and fringe detection, wherein the step of coding projection comprises time domain coding and space domain coding, and then fringe detection is performed. The structured light fringe projection method is mainly applied to occasions of vision inspection.

Description

technical field [0001] The invention relates to a structured light projection fringe coding method in visual detection technology, in particular to a structured light fringe projection method based on time domain and space domain hybrid coding. Background technique [0002] Structured light three-dimensional visual measurement technology has the advantages of non-contact visual measurement, high speed, high degree of automation, and good flexibility. Structured light 3D vision is based on the principle of optical triangulation, and calculates the surface profile of the measured object by calculating the offset information of various light mode feature points in the collected image. The optical projector projects a certain light pattern, which makes the structured light image information easy to extract, so the measurement accuracy is high, and it is widely used in the online detection of various industrial products. [0003] Compared with point structured light and line str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 孙长库陆鹏王鹏
Owner TIANJIN UNIV
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