Large-scale three dimensional shape and appearance measuring and splicing method without being based on adhesive mark

A shape measurement and marking technology, which is applied in the field of precision measurement, can solve the problems of destroying the characteristics of the measured shape itself, increasing the error of automatic recognition, and affecting the authenticity of the measurement, so as to achieve true and reliable measurement data, deceleration errors, and high efficiency. Effect

Inactive Publication Date: 2005-04-13
TIANJIN UNIV
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Problems solved by technology

[0005] The above method has obvious limitations: 1) For the appearance measurement of large objects, many marking points must be set, which is very cumbersome, and as the number of marking points increases, the error ...

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  • Large-scale three dimensional shape and appearance measuring and splicing method without being based on adhesive mark
  • Large-scale three dimensional shape and appearance measuring and splicing method without being based on adhesive mark
  • Large-scale three dimensional shape and appearance measuring and splicing method without being based on adhesive mark

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Embodiment approach

[0022] Such as figure 2 As shown, more than 4 global control points are placed in the measured space. The number of global points can be determined according to the actual requirements (the size of the measured object). The global control points are positioned at the center of the precision sphere. Three (or more) probe control points are fixed on the optical probe, and the probe control points are positioned by the center of a precision sphere or the center of a plane circle. The coordinates of the control points on the probe in the probe measurement coordinate system are pre-calibrated.

[0023] When measuring, first, use a digital camera to take images containing all global control points from multiple angles, and obtain the global control points in the global coordinate system O g x g Y g Z g The spatial coordinate value in ; secondly, the optical probe measures each area of ​​the measured object one by one, and when measuring each area S i when, such as image 3, u...

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Abstract

The large 3D body appearance measuring and splicing method without adhered mark converts the local position measuring data of local measuring head data with the measuring head controlling points to the global coordinates to realize splicing. The splicing process includes the following steps: setting in the measurement space one reference ruler with two mark points; obtaining images of the global marks and reference ruler in different posture with high resolution digital camera from different directions; photographing one image frame with the measuring head controlling point and at least 3 global control points; converting the measuring head measured data of all areas to the global coordinate system, etc. to complete the splicing of single area measuring data to the integral. No marks adhered to the measured body has no influence on the self characteristic of the measured appearance, true and reliable measurement data and high operation efficiency.

Description

technical field [0001] The invention relates to a precision measurement method, in particular to a splicing method for measuring the shape of a large object (body) not based on sticky marking points. Background technique [0002] Body shape measurement refers to the measurement of the surface shape of the body. It is the basic support technology for modern reverse engineering and product digital design, management and manufacturing. It is also an advanced product testing method. It has a wide range of application backgrounds in the field of advanced manufacturing. has drawn people's attention. [0003] Traditionally, there are two main types of schemes for realizing shape measurement: direct use of coordinate measuring machine (CMM) and indirect use of CMM measurement principles. The former directly applies the CMM, puts the object to be measured on the CMM, samples the object with the CMM probe, and obtains the shape data of the object. However, due to the limitation of th...

Claims

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Application Information

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IPC IPC(8): G01B11/03G01B11/24G01B21/04G01B21/20
Inventor 邾继贵吴斌刘常杰
Owner TIANJIN UNIV
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