• 제목/요약/키워드: Moire

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사방격자를 이용한 그림자식 무아레 토포그래피에서의 무아레 무늬의 절대차수 결정법 (Determination of the absolute order of moire fringes of moire shadow topography with a criss crossed grating)

  • 조선미;육근철;조재흥;장수
    • 한국광학회지
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    • 제9권1호
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    • pp.9-14
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    • 1998
  • 그림자식 무아레 무늬의 절대차수를 결정할 수 있는 새로운 방법으로 카메라와 광원의 위치좌표는 변화시키지 않고 사방격자의 피치 간격을 일정한 비율로 변화시키는 방법과, 사방격자의 피치간격은 변화시키지 않고 광원과 카메라 사이의 평면위치좌표를 변화시켜서 주기적인 무아레 무늬를 얻었다. 그 결과 사방격자에 의한 큰 주기의 무아레 무늬와 직선격자에 의한 작은 주기의 무아레 무늬를 비교함으로써 직선격자에 의한 무아레 무늬의 절대차수를 결정할 수 있음을 확인하였다.

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다중 도메인 학습을 이용한 화면 촬영 영상 내 모아레 무늬 제거 기법 (Screen-shot Image Demorieing Using Multiple Domain Learning)

  • 박현국;비엔지아안;이철
    • 방송공학회논문지
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    • 제26권1호
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    • pp.3-13
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    • 2021
  • 본 논문은 다중 도메인 학습을 이용하여 화면 촬영 영상 내 모아레 무늬를 효과적으로 제거하는 기법을 제안한다. 제안하는 기법은 먼저 화소값 영역과 주파수 영역에서 입력 영상의 모아레 무늬를 각각 제거한다. 다음으로 모아레 영상에서 clean edge map을 추정하고, 추정된 clean edge map을 가이드 정보로 사용하여 화소값 영역과 주파수 영역에서 얻은 결과 영상의 품질을 향상시킨다. 마지막으로, 독립적으로 향상된 두 결과 영상을 적응적으로 결합하며 모아레 무늬가 제거된 최종 결과 영상을 생성한다. 컴퓨터 모의 실험결과를 통해 제안하는 기법이 기존의 알고리즘보다 모아레 무늬를 더욱 효과적으로 제거할 수 있음을 확인한다.

장기근속 남성 택시기사와 일반인의 근골격계 균형에 관한 비교 연구 - 모아레 체형측정법을 통해 (A Comparative Study on the Balance of Musculoskelectal System between Long-Term Employed Male Taxi Drivers and General People - through Moire Topography)

  • 임상훈;박동수;이경무;정수현;김순중
    • 한방재활의학과학회지
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    • 제18권1호
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    • pp.141-151
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    • 2008
  • Objectives : The purpose of this study was to investigate effects of long-term taxi driving posture on the balance of musculoskelectal system. Methods : The author practiced Moire topography by using IBS-2000 for 30 male taxi drivers and general people. Then we measured difference of contour lines, difference of shoulder joint height, interval between vertical baseline of pelvis and vertical baseline of neck, ratio of thoracic curve and lumbar curve, difference of width between right and left through Moire topography. After we statistically analyzed difference of Moire topography's data between long-term employed male taxi drivers and general people. Results : 1. Taxi drivers, difference of contour lines in scapular, lumbar, gluteal region was bigger than general people and significant difference(p<0.05) was observed between subject group. 2. Taxi drivers, diference of shoulder joint height was more large than general people and significant difference(p<0.01) was observed between subject group. 3. Taxi drivers, diference of interval between vertical baseline of pelvis and vertical baseline of neck was more large than general people and significant difference((p<0.05) was observed between subject group. 4. Taxi drivers, ratio of thoracic curve was more large than general people and ratio of lumbar curve was more less than general people and significant difference(p<0.05) was observed between subject group. Conclusions : According to above results long-term taxi driving posture might cause musculoskelectal system unbalance.

사상체질별 상안부의 형태학적인 특징에 관한 연구 -모아레의 횡단면의 특성을 중심으로- (A MORPHOLOGICAL STUDY OF UPPER FACE ACCORDING TO THE SA-SANG CONSTITUTION)

  • 홍석철;이수경;송일병
    • 사상체질의학회지
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    • 제10권1호
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    • pp.161-170
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    • 1998
  • 1. 연구목적 : 외형적 특징을 통한 사상체질진단을 연구하기 위한 목적이다. 특별히 상안부에서 모아레 영상을 이용한 형태학적 차이를 찾고자 하였다. 2. 방법 : 1996년 4월부터 1997년 2월까지 경희의료원 부속한방병원 왜래환자 및 직원을 대상으로 설문지 및 임상적치료 경과를 통하여 체질적 경향성이 뚜렷한 대상자를 선별하였다. 이들을 동일촬영 조건을 통하여 얻은 얼굴 사진중 형태특이자를 제외한 113례의 모아레 사진을 분석하여 50항목을 측정하고 70항목의 공식을 제작하여 체질별 상이점을 도출하였다. 3. 결과 : 상안부 모아레 영상을 분석하여 체질에 따른 특징은 따로 도표로 제시한다. 4. 결론 : 소양인은 태음인 혹은 소음인에 비하여 좌측상안의 일부가 전방으로 돌출되었고, 태음인은 좌우측 상안의 비교에서 우측상안의 일부부위에서 소음인 혹은 소양인에 비하여 전방으로 돌출되었다. 모아레 영상을 이용하여 체질에 따른 상안부의 형태학적인 특징을 도출하였다.

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자동차회사 근로자를 대상으로 한 근골격계 자각증상과 moire 영상 진단과의 관계 연구 (Research on the Relation between Musculoskeletal symptoms and Diagnosis using Moire Topography among Workers at an Automobile Manufacturing Plant)

  • 천은주;이영길;장두섭;이기남;송용선
    • 대한예방한의학회지
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    • 제5권2호
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    • pp.69-92
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    • 2001
  • The purposes of this study were to offer foundation making more certain standards of musculoskeletal disorder diagnosis, We researched musculoskeletal symptoms degrees, frequencies, and cares and then examined relation between musculoskeletal symptoms and diagnosis of musculoskeletal conditions using moire topography among workers at an automobile manufacturing plant. Therefore we propose the possibility of moire topography as diagnosing utilities of musculoskeletal disorders. Methods: This study was to examine the general characteristics, complaints of musculoskeletal symptoms, and work-related musculoskeletal disorder rates of cervicobrachial and lumbar area by survey among 435 workers at an automobile manufacturing plant and then to show each frequency and percentage, In the diagnosis using moire topography, we studied pain control necessity of cervicobrachial and lumbar area, 435 subjects were classified by 5 levels: A(no symptoms), B(need management), C(need treatment) and then more divided by B1(light symptoms)/B2(heavy symptoms), C1(light symptoms)/C2(heavy symptoms), And musculoskeletal areas were divided by 2 parts, cervicobrachial area(neck, shoulder, arm&elbow, and wrist&hand) and lumbar area, Then, frequency and percentage of each musculoskeletal areas(cervicobrachial and lumbar area) were appeared. At last, Pearson's chi-square test analysis was utilized to observe the relation between diagnosis using moire topography and general characteristics and the relation between diagnosis using moire topography and work-related complaint of musculoskeletal symptoms of cervicobrachial and lumbar area, Results: The subjects employed for this research were categorized into; by gender, all of them were males(l00%): by age, under 35 years 12 %, 36-40 years 56.3%, 41-45 years 26.3 %, and above 46 years 5.3% with 36-40 years accounting for most of it. By living location, owned houses represented 69.7%, rented houses 23.4%, monthly-rented 1.6%, the others 5.3%; by education, middle school and lower represented 3.0%, high school 89.4%, and junior college and higher 7.6% with high school occupying most of the group. By marital status, married represented 95.2%, unmarried 4.1%, and the others 0.7% with most of them married; by alcohol, drinking represented 81.8% and non-drinking 18.2%; by smoking status, smoking represented 53.6%, non-smoking 46.4% with no big difference between them. By working time(hours/week), below 50 represented 26.9%, 50-60 67.6%, above 60 5.5%; by working time(hours/day), below 9 represented 21.6%, 10-12 73.1%, above 13 5.3%; by job tenure(years), below 10 represented 25.1%, 11-15 54.3%, 16-20 15.2%, above 21 5.5%. By personal income per year, below 30 million won represented 11.0%, 30-40 84.8%, above 40 4.1%; by sleeping hours, below 6 hours represented 26.7%, 7-8 hours 69.9%, above 9 hours 3.4%. Complaint rates of musculoskeletal symptoms and work-related musculoskeletal disorder rates were 63.9% and 54.9% with shoulder area occupying most of both them. By pain degree of musculoskeletal symptoms, shoulder area represented $2.73{\pm}0.84$, lumbar area $2.66{\pm}0.86$, wrist and hand area $2.59{\pm}0.86$, neck area $2.55{\pm}0.74$, and arm and elbow area $2.48{\pm}0.71$. By cares about musculoskeletal symptoms, taking medication or care represented 34.4%-46.7%, absence or leave 15.4%-28.7%, and job transfer 6.3%-11.5%. So experienced cases more than one thing among cares about musculoskeletal symptoms represented 39.6%-54%. In the diagnosis using moire topography, pain control necessity of cervicobrachial area was shown below; A(no symptoms) 20.7%, B1(need management/light symptoms) 64.6%, B2(need management/heavy symptoms) 11.5%, C1(need treatment/light symptoms) 3.0%, C2(need treatment/heavy symptoms) 0.2%. By lumbar area, A(no symptoms) 8.7%, B1(need management/light symptoms) 52.2%, B2(need management/heavy symptoms) 30.3%, C1(need treatment/light symptoms) 8.7%, C2(need treatment/heavy symptoms) was none. In the relation between pain control necessity and general characteristics, age(P=0.013), education(P=0.000), and job tenure(P=0.012) with pain control necessity showed differences with significance. The relation between pain control necessity and complaint of musculoskeletal symptoms of cervicobrachial and lumbar area showed no difference with significance; in cervicobrachial area represented P=0.708, lumbar area P=0.318 Conclusions: This study for musculoskeletal symptoms on workers at automobile manufacturing plant showed that complaint rates of musculoskeletal symptoms for cervicobrachial and lumbar area were so high, 63.9%. But Pearson's chi-square test analysis was utilized to study the relation between musculoskeletal symptoms and the diagnosis using moire topography, showed no differences with significance. They have no differences with significance, but the prevalence rates of diagnosis using moire topography for cervicobrachial and lumbar area were more higher than complaint rates of musculoskeletal symptoms; complaint rates of musculoskeletal symptoms were 52.4%, 34.5% and the diagnosis using moire topography were 79.3%, 91.3% for cervicobrachial and lumbar area. The results of this study indicate that the diagnosis using moire topography can find weak musculoskeletal disorders that an individual can not feel, not be judged work-related musculoskeletal disease. Therefore, this study has an important meaning that diagnosis using moire topography can predict and control own physical condition complete musculoskeletal disorders beforehand, since oriental medicine theory considers that prevention is important.

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Fourier 변환 모아레 간섭에 의한 이차원적 변형률 해석 (Tow-dimensional Strain Analysis by Fourier Transform Moire Interferometry)

  • 박두원;도전 태조;삼본 길춘;한응교
    • 비파괴검사학회지
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    • 제12권1호
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    • pp.16-24
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    • 1992
  • Moire interferometry using a diffraction grating and a laser is a powerful technique for analizing small deformation of a specimen. In the method, the x and y-directional fringe patterns are obtained by using the x and y-directional sets of two beams. If the both sets of two beams are simultaneously incident to the specimen, the x and y-directional fringe patterns are super imposed. In this case, it is difficult to separate each directional fringe pattern. Therefore each fringe pattern has been separately recorded by selecting each set of two beams. In order to analyze a two-dimensional strain changing with time, Moire interferometry using the two-dimensional fourier transform method is proposed and the x and y-directional fringes are separated. By this method, the thermal deformation of a glass plate is analyzed.

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피치가변격자를 이용한 자유곡선 형상측정에 관한 연구 (A Study on the Measurement of 3-D object, make use of grid fringe generator)

  • 박윤창;정경민;박경근;장석준
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 추계학술대회 논문집
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    • pp.19-22
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    • 2000
  • Noncontact measuring methodology of 3-dimensional profile using CCD camera are very attractive because of it's high measuring speed and its's high sensitivity. Especially, when projecting a grid pattern over the object the captured image have 3 dimensional information of the object. Projection moire extract 3-D information with another grid pattern in front of CCD camera. However phase measuring profilometry(PMP) obtain similar results without additional grid pattern. In this paper, new method for grid pattern generation system by polygonal mirror and Laser Diode. This system is applied the projection moire and the PMP.

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모아레 간섭계를 이용한 BGA 패키지의 비선형 열변형 해석 (Non-linear Temperature Dependent Deformation Analysis of BGA Package Using Moire Interferometry)

  • 주진원
    • 한국마이크로전자및패키징학회:학술대회논문집
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    • 한국마이크로전자및패키징학회 2003년도 기술심포지움 논문집
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    • pp.28-32
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    • 2003
  • Thermo-mechanical behavior of a ceramic ball grid array(CBGA) package assembly and wire bond ball grid array(WB-PBGA) package assemblies are characterized by high sensitive moire interferometry. Moire fringe patterns are recorded and analyzed at various temperatures in a temperature cycle. Thermal-history dependent analyses of global and local deformations are presented, and bending deformation(warpage) of the package and shear strain in the rightmost solder ball are discussed. A significant non-linear global behavior is documented due to stress relaxation at high temperature. The locations of the critical solder ball in WB-PBGA package assemblies are documented.

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모아레 원리를 이용한 스핀들의 반경방향 회전정도 측정 (Measurement of Radial Error Motions of a Rotating Spindle by Moire Topography)

  • 박윤창;김승우
    • 대한기계학회논문집
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    • 제17권11호
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    • pp.2723-2729
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    • 1993
  • Moire principles are applied to the measurement of the spindle radial error motion. As opposed to conventional techniques, no master cylinder or ball is needed in the measurement so that the offset and out-of-roundness errors of the master can be inherently eliminated. Two periodic circular gratings are used, one is made on the spindle and the other is held stationary on the reference frame. When the two gratings are seen superimposed during spindle rotation, an interference fringe pattern is observed from which the information on the eccentricity between the two gratings can be extracted with high precision. The optical design and fringe analysis techniques of a prototype measurement system are described in detail with exemplary measurement results.

초정밀 엔코더를 위한 신호처리기법 개발 (Signal Processing Algorithm for High Precision Encoder)

  • 정규원
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 1999년도 추계학술대회 논문집 - 한국공작기계학회
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    • pp.320-325
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    • 1999
  • An absolute type shaft encoder which utilized moire fringe will be presented in this paper. Linear moire fringe is commonly used to measure the displacement of the linear motion. However, an absolute encoder which measure the rotation angle of a shaft is operated usually with a code disk which the gray code pattern is printed on. Such encoder has inherently resolution limit because of the patterning mechanism and sensing mechanism. In order to measure the position of fringes which move as the code disk rotates, neural network was developed in this paper. Formerly fringe position is usually measured by a sophisticated software, which needs a little long calculation time. However, using neural network method can eliminate such calculation time, even though it needs learning job. The proposed method is verified through several experiments.

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