• 제목/요약/키워드: Size Inspection

검색결과 639건 처리시간 0.025초

크기와 회전 변화에 불변 모멘트 알고리즘을 이용한 자동 검사 시스템에 관한 연구 (A Study on the Automatic Inspection System using Invariant Moments Algorithm with the Change of Size and Rotation)

  • Lee, Yong-Joong
    • 한국공작기계학회논문집
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    • 제13권3호
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    • pp.37-43
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    • 2004
  • The purpose of this study is to develop a practical image inspection system that could recognize it correctly, endowing flexibility to the productive field, although the same object for work will be changed in the size and rotated. In this experiment, it selected a fighter, rotating the direction from $30^{\circ}$ to $45^{\circ}$ simultaneously while changing the size from 1/4 to 1/16, as an object inspection without using another hardware for exclusive image processing. The invariant moments, Hu has suggested, was used as feature vector moment descriptor. As a result of the experiment, the image inspection system developed from this research was operated in real-time regardless of the chance of size and rotation for the object inspection, and it maintained the correspondent rates steadily above from 94% to 96%. Accordingly, it is considered as the flexibility can be considerably endowed to the factory automation when the image inspection system developed from this research is applied to the productive field.

공정 중심의 검사 방식에 대한 로트 품질보증 및 검사비용 추정 시스템 개발 (Development of A Lot Quality Assurance and Inspection Cost Estimation System for Process-Centered Inspections)

  • 이도경;이승우
    • 산업경영시스템학회지
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    • 제29권1호
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    • pp.34-40
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    • 2006
  • Many producers put sampling inspection policy into the way of their convenience. Examples of the convenience are irregular lot size and too small sample size. Because they don't use a standard sampling inspection policy, they can not guarantee the quality level of their products. In this study, we developed a user-centered design program which can calculate the AOQL of their products to their buyers in the case of irregular lot size and too small sample size. Also this program propose a linear inspection cost by Hald's model.

A Study on the Automatic Inspection System using Invariant Moments Algorithm with the Change of Size and Rotation

  • 이용중;이양범;정기화
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2004년도 춘계학술대회 논문집
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    • pp.479-485
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    • 2004
  • The purpose of this study is to develop a practical image inspection system that could recognize it correctly, endowing flexibility to the productive field, although the same object for work will be changed in the size and rotated. In this experiment, it selected a fighter, rotating the direction from $30^{\circ}\;to\;45^{\circ}$ simultaneously while changing the size from 1/4 to 1/16, as an object inspection without using another hardware for exclusive image processing. The invariant moments, Hu has suggested, was used as feature vector moment descriptor. As a result of the experiment the image inspection system developed from this research was operated in real-time regardless of the chance of size and rotation for the object inspection, and it maintained the correspondent rates steadily above from 94% to 96%. Accordingly, it is considered as the flexibility can be considerably endowed to the factory automation when the image inspection system developed from this research is applied to the productive field.

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소형 머신 비전 검사 장비에 기반한 O링 치수 측정 (O-ring Size Measurement Based on a Small Machine Vision Inspection Equipment)

  • 정유수;박길흠
    • 한국산업정보학회논문지
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    • 제19권4호
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    • pp.41-52
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    • 2014
  • 본 논문은 O링의 치수 측정에 있어 고가의 대 중형 머신비전 장비를 대체할 수 있는 소형 머신 비전 검사 장비에 기반한 O링 부품 내 외경 측정 알고리즘을 제안한다. 백라이트 조명하에 하나의 CCD 카메라를 이용하여 측정 평면으로 부터 영상을 획득하는 소형 머신 비전 검사장비에 의해 획득된 영상을 제안한 영상처리 기법 알고리즘을 이용하여 O링의 외경 및 내경치수를 측정한다. 치수 측정의 정확도를 높이기 위해 렌즈계 왜곡 보정과 원근 왜곡 보정을 소프트웨어적 기법으로 보정 하였고 O링 형상을 고려하여 타원정합 모델을 적용하였으며 보다 타원 정합의 신뢰성을 높이기 위해 RANSAC알고리즘을 적용하였다.

결함크기 측정오차로 인한 오검률의 통계적 예측 (Statistical Prediction of False Alarm Rates in Automatic Vision Inspection System)

  • 주영복;허경무;박길흠
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2009년도 정보 및 제어 심포지움 논문집
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    • pp.163-165
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    • 2009
  • Automatic Vision Inspection(AVI) systems automatically detect defect features and measure their sizes via camera vision. It is important to predict the performance of an AVI to meet customer's specification in advance. In this paper, we propose a statistical method for prediction of false alarm rate regarding inconsistency of defect size measuremet process. We only need are a simple experimental trial for repeated defect size measurement test. The statistical features from the experiement are utilized in the prediction process. Therefore, the proposed method is swift and easy to implement and use. The experiment shows a close prediction compared to manual inspection results.

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Cluster Sampling in Sampling Inspection: Bayes Estimation

  • Juyoung Lee
    • Communications for Statistical Applications and Methods
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    • 제6권1호
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    • pp.107-116
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    • 1999
  • We propose a sample design which minimize Bayes risk for cluster smpling in sampling inspection. We treat a pilot sample and an additional sample size as random variable. In addition we compute an appropriate cluster size for handling over-dispersion.

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A Study on the Automatic Inspection System using Invariant Moments Algorithm with the Change of Size and Rotation

  • 이용중
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2003년도 추계학술대회
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    • pp.164-169
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    • 2003
  • The purpose of this study is to develop a practical image inspect ion system that could recognize it correctly, endowing flexibility to the productive field, although the same object for work will be changed in the size and rotated. In this experiment, it selected a fighter, rotating the direction from 30$^{\circ}$ to 45 simultaneously while changing the size from 1/4 to 1/16, as an object inspection without using another hardware for exclusive image processing. The invariant moments, Hu has suggested, was used as feature vector moment descriptor. As a result of the experiment, the image inspect ion system developed from this research was operated in real-time regardless of the chance of size and rotation for the object inspection, and it maintained the correspondent rates steadily above from 94% to 96%. Accordingly, it is considered as the flexibility can be considerably endowed to the factory automat ion when the image inspect ion system developed from this research is applied to the product ive field.

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저항용접에서의 용접성 평가에 관한 연구 (A Study on the Evaluation of Weldability in Spot Welding)

  • 홍민성;김종민
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2003년도 추계학술대회
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    • pp.301-306
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    • 2003
  • Spot welding is frequently used for industrial purpose, such as automobile and aerospace industries and household appliances due to its high performance. In these day, robotization and systemization of welding process made it possible to produce more precise or smaller electric parts. And when it comes to welding of steel sheet, the size of nugget must be getting smaller. Therefore, welding conditions are limited to avoid defects, such as deformation, damage, weakening of joining area. In this research, the measurement of the nugget size by the nondestructive inspection has been conducted. As a result, the right estimation of the nugget size and void defects, the detection of corona bond near joining area, the selection of the optimum ultrasonic mode, and set up for ultrasonic inspection are studied. From the trustworthy solutions of nugget size estimated by results of measurement, the optimum inspection conditions depending upon the width of welding parts are determined as well.

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초음파를 이용한 미세저항용접에서의 용접성 평가에 관한 연구 (A Study on the Evaluation of Weldability Using Ultrasonic in Thin Spot Welding)

  • 홍민성;김종민
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2004년도 추계학술대회 논문집
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    • pp.49-53
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    • 2004
  • Thin spot welding is frequently used for industrial purpose, such as automobile and aerospace industries and household appliances due to its high performance. In these days, the systemization of welding process made it possible to produce more precise or smaller electric parts. And when it comes to welding of steel sheets, the size of nugget must be getting smaller. Therefore, welding conditions are limited to avoid defects, such as deformation, damage and weakening of joining area. In this research, thin spot welding establishes the welding conditions, and then the measurement of the nugget size by the nondestructive inspection has been conducted. As a result, the right estimation of the nugget size, the detection of corona bond near joining area, the selection of the optimum ultrasonic mode, and setup for ultrasonic inspection are studied. From the trustworthy solutions of the nugget size estimated by results of measurement, the optimum inspection conditions depending upon the width of welding parts are determined as well.

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선형검사과오(線型檢査過誤)를 고려한 최소비용(最少費用)의 선별검사방식(選別檢査方式) (Economic Screening Inspection Plan Under Linear Inspection Error)

  • 김광섭;황의철
    • 품질경영학회지
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    • 제16권2호
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    • pp.82-91
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    • 1988
  • This study is concerned with the development of the economic sampling inspection plan when it is possible to carry out a nondestructive screening inspection for the rejected lots by substitutive characteristics closely related to the original quality characteristic. It is assumed that the probabilities of those errors depend linearly on the fraction defective of the process. The inspection policies considered are as follows: take a random sample of size n from the lot of size N and perform a destructive test on the sample. If the number of the defective items is not greater than a critical number C, accept the lot. Expected cost functions are obtained when the process average can be considered to follow a beta distribution and the way of finding the optimal values of (n, c) is to be explored.

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