• Title/Summary/Keyword: 기하학적 오차

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Enhanced Mesh Simplification using Extended Quadric Error Metric (확장된 이차오차 척도를 이용한 개선된 메쉬 간략화)

  • Han Tae-hwa;Chun Jun-chul
    • The KIPS Transactions:PartA
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    • v.11A no.5
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    • pp.365-372
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    • 2004

  • Recently, the studies for mesh simplification have been increased according to the application area of the complicate 3D mesh models has been expanded. This paper introduces a novel method for mesh simplification which uses the properties of the mesh model in addition to the geometric locations of the model. The information of the 3D mesh model Includes surface properties such as color, texture, and curvature information as well as geometic information of the model. The most of current simplification methods adopt such geometric information and surface properties individually for mesh simplification. However, the proposed simplification method combines the geometric information and solace properties and applies them to the simplification process simultaneously. In this paper, we exploit the extended geometry based quadric error metric(QEM) which relatively allows fast and accurate geometric simplification of mesh. Thus, the proposed mesh simplification utilizes the quadric error metric based on geometric information and the surface properties such as color, normal, and texture. The proposed mesh simplification method can be expressed as a simple quadric equation which expands the quadric error metric based on geometric information by adding surface properties such as color, normal, and texture. From the experimental results, the simplification of the mesh model based on the proposed method shows the high fidelity to original model in some respects such as global appearance rather than using current geometry based simplification.

  • https://doi.org/10.3745/KIPSTA.2004.11A.5.365 인용 PDF KSCI

Measurement Method for Geometric Errors of Ultra-precision Roll Mold Machine Tool: Simulation (초정밀 롤 금형 가공기의 기하학적 오차 측정 방법: 모의실험)

  • Lee, Kwang-Il;Yang, Seung-Han
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.10
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    • pp.1087-1093
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    • 2013

  • In this study, a measurement method of double ball-bar is proposed to measure the geometric errors of an ultra-precision roll mold machine tool. A volumetric error model of the machine tool is established to investigate the effects of the geometric errors to a radius error and a cylindricity of the roll mold. A measurement path is suggested for the geometric errors, and a ball-bar equation is derived to represent the relation between the geometric errors and a measured data of the double ball-bar. Set-up errors, which are inevitable at the double ball-bar installation, also are analyzed and are removed mathematically for the measurement accuracy. In addition, standard uncertainty of the measured geometric errors is analyzed to determine the experimental condition. Finally, the proposed method is tested and verified through simulation.

  • https://doi.org/10.7736/KSPE.2013.30.10.1087 인용 PDF KSCI