Three-dimensional rapid measurement method for raster projection based on defocusing phase-unwrapping of projector

A technology of grating projection and measurement method, applied in measurement devices, instruments, optical devices, etc., can solve problems such as slow speed, increased system hardware cost and time cost, and higher requirements.

Active Publication Date: 2015-09-09
SOUTHEAST UNIV
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Problems solved by technology

The phase obtained by this method is accurate, convenient, and the algorithm is simple, but it needs to add a number of auxiliary grating stripes,

Method used

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  • Three-dimensional rapid measurement method for raster projection based on defocusing phase-unwrapping of projector
  • Three-dimensional rapid measurement method for raster projection based on defocusing phase-unwrapping of projector
  • Three-dimensional rapid measurement method for raster projection based on defocusing phase-unwrapping of projector

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Embodiment Construction

[0048] Under the Windows operating system, MATLAB is selected as the programming tool to design and generate the required grating, and Visual Studio is selected as the programming tool to process the deformed grating collected by the camera. In this example, the human hand is used as the measured object, and an additional binary raster image can be used to obtain a relatively accurate absolute phase distribution containing three-dimensional information, and generate three-dimensional point cloud data.

[0049] Such as figure 1 Shown, be method flowchart of the present invention, comprise the steps:

[0050] (1) Utilize the computer to generate a standard sinusoidal grating image I with a size of M rows and N columns, and the grayscale calculation formula of each point is:

[0051]

[0052] Among them, I(i,j) is the gray value of grating image I at row i, column j, and p is the period of grating stripes, is the phase shift of the grating;

[0053] (2) I generates binary ...

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Abstract

The invention discloses a three-dimensional rapid measurement method for raster projection based on defocusing phase-unwrapping of a projector, and the method comprises the following steps: generating various types of raster patterns through a computer; enabling the raster patterns to be projected on a to-be-measured object in a defocusing manner through the projector; employing a camera to collect raster images; employing a four-step phase shift method to obtain a main value phase; employing an additional raster pattern to obtain a standardized auxiliary raster pattern; employing a gray-scale code method to achieve the phase expansion of the main value phase; calibrating the camera and the projector, and calculating three-dimensional coordinates according to a spatial intersection method. The beneficial effects of the invention are that a measurement speed reaches the maximum refresh rate of the projector, thereby achieving great improvement; the projector does not need to be corrector in a non-linear manner; the additional two-value raster pattern is added, and is used for the accurate conversion of the phase-unwrapping auxiliary raster pattern into standard two-value distribution, thereby obtaining a precise gray-scale code for solving an absolute phase, solving a problem that the absolute phase of a complex surface target is not accurate, and improving the phase quality.

Description

technical field [0001] The invention relates to the field of three-dimensional information reconstruction, in particular to a grating projection three-dimensional rapid measurement method based on projector defocus and phase resolution. Background technique [0002] Optical three-dimensional measurement technology can accurately obtain three-dimensional surface data of objects, which can be used for three-dimensional model reconstruction, object surface profile measurement, detection of size and shape parameters in industrial environments, etc., so it is used in virtual reality, projection special effects, medical plastic surgery and Beauty, appearance design of industrial products, art sculpture and cultural relics protection and other fields have broad application prospects. [0003] The grating projection method is an important three-dimensional measurement technology. By projecting a sinusoidal grating to the surface of the object, the height information of the object is...

Claims

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Application Information

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IPC IPC(8): G01B11/25
Inventor 达飞鹏郑东亮赵立伟肖毅鹏戴鲜强张璞
Owner SOUTHEAST UNIV
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