Three-dimensional feet data measuring method to sparse grid based on curve subdivision

A sparse grid and surface subdivision technology, applied in image data processing, image data processing, diagnostic recording/measurement, etc., can solve the problems of costly post-processing time, time-consuming and labor-intensive, etc.

Inactive Publication Date: 2007-01-17
ZHEJIANG UNIV
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The direct impact of this kind of motion noise makes the user need to spend a l...

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  • Three-dimensional feet data measuring method to sparse grid based on curve subdivision
  • Three-dimensional feet data measuring method to sparse grid based on curve subdivision
  • Three-dimensional feet data measuring method to sparse grid based on curve subdivision

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[0050] First, load the sparse mesh foot model, see Image 6 . Since the loaded sparse grid foot model cannot be used for direct measurement, it can be seen in the figure that it has many edges and corners. If it is measured directly, it will cause a large error, and the obtained data is basically unusable. For use in shoemaking. Therefore, it needs to be subdivided to turn this sparse grid foot model into a three-dimensional feature foot model, see the attached Figure 7. After such transformation, we can see that the edges and corners in the sparse grid foot model have disappeared, and such data can be used for measurement. In the next step, project the generated 3D foot model onto the XOY plane, see attached Figure 8 , to get the proportion map of the outline of the foot. After observation, we found that all the foot shape parameters for shoemaking can be calculated by only getting the seven feature points on the foot shape. The seven characteristic points are: the ter...

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Abstract

A sparse lattice-oriented method based on the fine division of curved surface for measuring the data about 3D foot type includes such steps as reading the 3D foot model on sparse lattice, setting up the iterative parameters for fine division, finely dividing the 3D foot model on sparse lattice, smoothing the generated 3D foot model, examining the terminating conditions of said model, 2D projection of generated 3D foot model, choosing the characteristic dots on the 2D profile of 3D foot model, obtaining the peripheral length of foot type, and outputting the characteristic parameters about foot type.

Description

technical field [0001] The invention relates to a fast measurement method for three-dimensional foot shape data, in particular to a sparse grid-oriented three-dimensional foot shape data measurement method based on surface subdivision. Background technique [0002] As far as the acquisition of foot shape data is concerned, the current mainstream technical approach is based on optical systems, including: [0003] 1) Laser-based triangulation technology. It is a very popular three-dimensional data acquisition method at present, with high precision and wide application range, but the equipment is expensive. The main components are high-speed camera, laser transmitter, signal processor, high-precision stepping motor, etc. [0004] 2) Measurement technology based on structured light. The main components are dedicated projectors, cameras, etc. The accuracy is medium, and the price is medium. [0005] 3) Measurement technology based on computer vision. The main device is the ...

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Application Information

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IPC IPC(8): A61B5/107G06T1/00
Inventor 潘云鹤耿卫东高飞徐兴华王毅刚
Owner ZHEJIANG UNIV
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