Method and system for measruing object two-dimensiond surface outline

A technology of object surface and three-dimensional contour, applied in the direction of measuring device, 3D image processing, image data processing, etc., can solve the problems of difficult practical application and poor system operability

Inactive Publication Date: 2004-03-24
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The big problem with the projected grating phase method is that its system operability is not good, and it is difficult to realize practical application

Method used

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  • Method and system for measruing object two-dimensiond surface outline
  • Method and system for measruing object two-dimensiond surface outline
  • Method and system for measruing object two-dimensiond surface outline

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Embodiment Construction

[0093] A kind of three-dimensional measurement method proposed by the present invention and the embodiment of the system are described as follows:

[0094] The measurement system of this embodiment is as figure 1 shown. The system is composed of CCD cameras 1, 3, projector 2, computer 4 and so on.

[0095] The computer is PIII 1G with 1394 graphics card, and the graphics card supports dual monitor output.

[0096] The ASK C20+ high-definition digital projector used in the system has a brightness of 1500 ANSI lumens and a resolution of 800×600.

[0097] The CCD adopts the A302f digital camera of Germany Basler Company, its resolution reaches 780×582, conforms to the IEEE1394 industrial standard, and is used with the Computar M1214-MP fixed-focus lens. The steps taken by the method are as follows, wherein the implementation of the software is developed using the Visual C++6.0 platform:

[0098] 1) Use a computer to generate a virtual grating, including a coded grating and a ...

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Abstract

The invention is a method to measure the object's three-dimensional surface outline and the system, its characters: adopting the combination of phase and stereo visual techniques to project grating on the object's surface, using coding light and phase-shifting method to obtain the phase of each point in the images shot by the left and right vidicons, and phase and outer polar line to realize the matching of the points, to calculate the three-dimensional space coordinates of the points, which realizes the measurement. For measuring single surface, it can obtain extremely high-density data only within 2 seconds, up to 400,000 points, and the measuring precision above 0.05mm.

Description

technical field [0001] A method and system for measuring a three-dimensional profile of an object's surface belong to the technical field of object three-dimensional measurement methods. Background technique [0002] The three-dimensional measurement technology of objects is widely used in product design and manufacturing, quality inspection and control, robot vision and other fields. In recent years, its application has also expanded to product imitation, rapid manufacturing system, product reverse design, online inspection, clothing production, film and television special effects, virtual reality, art sculpture and other fields. [0003] There are two main types of methods for 3D profile measurement, contact and non-contact. The main method of contact measurement is a three-coordinate measuring instrument, which has a high measurement accuracy of up to 0.5 μm. But this method is not suitable for the measurement of soft objects, the measurement speed is slow, and it has h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24G01B21/20G06T15/00
Inventor 钟约先李仁举张吴明马扬飚袁朝龙叶成蔚
Owner TSINGHUA UNIV
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