Automatic preparation body neck-edge line extraction method based on MS complex

An automatic extraction and cervical margin line technology, applied in the field of oral restoration, can solve the problems of undetected, noise-sensitive, cervical margin line extraction, etc., and achieve the effect of high efficiency, reduced impact, and noise insensitivity

Inactive Publication Date: 2015-10-21
GUANGDONG UNIV OF TECH
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AI Technical Summary

Problems solved by technology

There are also some neckline extraction algorithms in China, but there are more or less the following shortcomings: (1) the extraction accuracy is not high; (2) the robustness is not good, and it is more sensitive to noise; (3) the degree of automation is not high, It is necessary to manually pick an initial point or several feature points
However, the feature lines extracted by this method include valley lines and boundary lines, which cannot be directly used for cervical line extraction, and no method based on MS complex has been found for oral restoration, especially for cervical line extraction.

Method used

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  • Automatic preparation body neck-edge line extraction method based on MS complex
  • Automatic preparation body neck-edge line extraction method based on MS complex
  • Automatic preparation body neck-edge line extraction method based on MS complex

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Experimental program
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Embodiment Construction

[0049] refer to figure 1 , an automatic extraction method for the cervical margin line of preparations based on MS complex, including:

[0050] S1, establish MS complex structure;

[0051] S2, noise reduction processing;

[0052] S3, MS complex simplification;

[0053] S4, screening characteristic lines;

[0054] S5. Evolving the characteristic line into a cervical margin line.

[0055] refer to figure 2 , further as a preferred embodiment, the step S1 includes:

[0056] S11. Build index function: Calculate the average curvature K of each vertex by moving least squares surface method H (p i ), and with K H (p i ) as the index function of each vertex;

[0057] S12. Discrimination critical point: use the index function described in S11 as the basis to determine the critical point of MS complex, including minimum value point, maximum value point and saddle point;

[0058] S13. Construct ascending and descending arcs: starting from the saddle point, search along the gr...

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Abstract

The invention discloses an automatic preparation body neck-edge line extraction method based on MS complex. The method comprises the following steps: S1) establishing an MS complex structure; S2) carrying out noise reduction processing; S3) carrying out MS complex simplification; S4) screening feature lines; and S5) evolving the feature lines into neck-edge lines. The method is high in efficiency and insensitive to noise, can automatically extract more accurate neck-edge lines, and can be widely applied to the mouth rehabilitation field.

Description

technical field [0001] The invention relates to a method for automatically extracting cervical margin lines based on MS reconstruction, which belongs to the field of oral restoration. Background technique [0002] The extraction technology of the cervical margin of the preparation is the key technology of oral CAD / CAM restoration. At present, foreign advanced dental prosthetic CAD / CAM systems generally have the function of automatic or interactive extraction of cervical margin, and most of the algorithms are unknown. There are also some neckline extraction algorithms in China, but there are more or less the following shortcomings: (1) the extraction accuracy is not high; (2) the robustness is not good, and it is more sensitive to noise; (3) the degree of automation is not high, It is necessary to manually pick an initial point or several feature points. [0003] Compared with the neckline extraction technology, there have been a lot of researches on the feature line extrac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/20
Inventor 魏昕肖兵谢小柱黄飞邹建军
Owner GUANGDONG UNIV OF TECH
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