• Title/Summary/Keyword: Moire topography

Search Result 54, Processing Time 0.029 seconds

A Study on Projective Calibration for Arbitrary Display Surface using Digital Moire Method. (Digital Moire를 이용한 임의의 영사면에 대한 투영보정에 관한 연구)

  • 유원재;김도훈;강영준;백성훈
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2003.06a
    • /
    • pp.292-295
    • /
    • 2003
  • Moire topography method is a well-known non-contacting 3-D measurement method. the automatic 3-D measurement by moire topography has been required since the method was frequently applied to the engineering and medical fields. 3-D measurement using digital projection moire topography is very attractive because of its high measuring speed and high sensitivity. In this study, digital two-wavelength phase shilling moire is applied to the entertainment fields. recently. as promoting the growth of the VR-Game, display devices which attract public attention such as HMD or Projector are being appeared in order to deliver effectively the absorption sense. this study realized the Auto-calibrating system for arbitrary display surface using digital moire method which satisfied the shape measurement of display surface and the request of FOV(Field of View) output. also when large screen wasn't prepared, this auto-calibrating system was applied to enjoy games or movies at home with a projector and walls

  • PDF

A Study on the Improvement of Accuracy of Surface Measurement in the Phase-Shifting Shadow Moir$\'{e}$ Method (위상이동 그림자 무아레방법을 이용한 형상측정법의 정확도 개선에 관한 연구)

  • 강영준;유원재;권용기
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.15 no.10
    • /
    • pp.96-102
    • /
    • 1998
  • In this study, the theory and application of phase-shifting shadow moire topography is focused on the non-contact measurement of object surfaces for practical use in the field of production engineering. Shadow moire topography has been studied during last few decades in the area of the optical physics, and now its mathmatical theory has been established. Generally, in case of the classical shadow moire topography, the sensitivity is a few tenths of millimeter in best cases. Here we tried the application of phase-shifting method to the conventional shadow moire topography. But the reference grating and the deformed grating are mutually dependent because it is impossible to obtain uniform phase shifts on the whole Held. Therefore it is difficult to use a phase-shifting method in shadow moire topography. However, it was shown that constant phase-shifting was able to be measured by moving both the grating and light source. Finally we obtained a better result by using this procedure and applied the phase-shifting shadow moire to three dimensional object measurement.

  • PDF

A study on 3-D shape measurement for the composition of human bust (인체흉상 합성을 위한 3차원 형상 측정에 관한 연구)

  • 안중근;강영준;최정표;유원재
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 1997.10a
    • /
    • pp.220-223
    • /
    • 1997
  • Moire topography method is a well-known non-contacting 3-D measuement method. Recently, the automatic 3-D measurement by moire topography has been required since the method was frequently applied to the engineering and medical fields. 3-D measurement using projection moire topography is very attractive because of it's high measuring speed and high sensitivity. In this paper, using two-wavelength method of projection moire topography tested to measuring object with the 2x-ambiguity problem. Experimental results prove that the proposed scheme is capable of finding absolute fringe orders, so that the 2x-ambiguity problem can be effectively overcome so as to treat large step discontinuities in measured objects.

  • PDF

A Study about Interpretation of Moire' topography (Moire'무늬의 영상해석(影像解釋)에 관한 고찰(考察))

  • Park, Young-Hoi;Chung, Seok-Hee;Kim, Sung-Soo;Shin, Hyun-Dae;Lee, Jong-Soo
    • The Journal of Korean Medicine
    • /
    • v.20 no.2
    • /
    • pp.157-164
    • /
    • 1999
  • This study focused on the method of interpreting Moire's topography. There has been no standard of interpretation which informed, this study, The conclusions arc as follows: Miore's image closed contour lines which is consisted of points. These points in one contour have the same distances from the screen to the patient's back. Moire's index means the number of contour gaps from symmetrical point of a specific point with the axis of central line. The number of contours which pass the median line means the degree of antero-posterior curvature.

  • PDF

Effect of Body Shaping by Wearing Girdle (거들 착용이 체형보정에 미치는 효과)

  • Park, Eun-Joo
    • Fashion & Textile Research Journal
    • /
    • v.3 no.3
    • /
    • pp.235-240
    • /
    • 2001
  • This paper was intended to grasp an effect of body shaping by wearing girdle using moire topography. In wearing test, four type girdle were used, panty type, long leg type, high waist type, long leg and high waist type. Subjects were ten female college student (18-24 years old), they were selected on the size of the hip girth, waist girth that are within 25~75% in percent on the National Anthropometric survey of Korea in 1997. Three-dimentional characteristic of body shaping was analyzed by the moire topograph. As a result, body shaping effect was confirmed by moire pattern and horizantal section map. In case of the comparison through the moire topography, all the subjects have an effect on body shaping in part of waist girth, abdomen, and hip. Especially backside silhouettes on hip all the ten female subjects showed hip-up effect. Long leg type girdle was smooth side line in the hip and thigh. Further study required for the effect of wearing the girdle on the body shapeability and comfort.

  • PDF

The Characteristics of the Moire Topography in Patients of HIVD of Cx-spine (경추 추간판 탈출증 환자의 경근무늬 측정상의 특징)

  • Park, Jung-Hyuk;Yoo, Han-Gil
    • The Journal of Korea CHUNA Manual Medicine
    • /
    • v.6 no.1
    • /
    • pp.21-30
    • /
    • 2005
  • Objectives : This study was designed to find The characteristics of the Moire topography in patients of HIVD of Cx-spine. Methods : The Moire topography using IBS(Intek-plus Body Scanner 2000, Seoul, Korea) were obtained in 688 people of control group and 105 patients of HIVD of Cx-spine. Each values were studied to determine the difference between controls and patients. Results : There were significantly difference between controls and patients in thoracic ratio, lumbar ratio, top of the thoracic depth ratio, top of the lumbar depth ratio, Z axis distance and DZ/DY. Conclusions : There were increase of the thoracic kyphosis and lower position in top of the thoracic kyphosis in patients of HIVD of Cx-spine than controls.

  • PDF

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

  • Lim, Sang-Hoon;Park, Dong-Su;Lee, Kyung-Moo;Jeong, Su-Hyeon;Kim, Soon-Joong
    • Journal of Korean Medicine Rehabilitation
    • /
    • v.18 no.1
    • /
    • pp.141-151
    • /
    • 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.

Fringe Sensitivity of Projection Moire Topography Due to Position of Light Source and Object Distance According to Grating Periods (영사식 무아레 토포그래피에서 격자 주기에 따른 물체거리와 광원의 위치에 대한 무늬 민감도 변화)

  • Oh, Hyun Seock;Ju, Yun Jae;Jo, Jae Heung
    • Korean Journal of Optics and Photonics
    • /
    • v.27 no.2
    • /
    • pp.67-72
    • /
    • 2016
  • In projection moire topography, the investigation of fringe sensitivity, which means the change rate of fringe order according to object height, is important and necessary to reduce the measurement error of the shape of an object. Using the fringe sensitivity, the determination of the absolute orders of moire fringes can be performed very easily and rapidly. The important parameters in the determination of absolute orders of fringes are the positions of light source and object, and the grating period in projection moire topography. Among these parameters, the fringe sensitivity due to the transverse motion of the light source and the longitudinal motion of the object according to grating periods are analyzed and compared. As a result, whereas the fringe sensitivity in the transverse-motion method increases linearly and gradually as the distance between light source and imaging sensor increases, the fringe sensitivity due to the longitudinal-motion method decreases dramatically as the distance between imaging lens and object increases. In these methods, the fringe sensitivity and its change increase as the grating period increases.

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

  • Chun Eun-Joo;Lee Young-Gil;Jahng Doo-Sub;Lee Ki-Nam;Song Yung-Sun
    • Journal of Society of Preventive Korean Medicine
    • /
    • v.5 no.2
    • /
    • pp.69-92
    • /
    • 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.

  • PDF

East 3-Dimensional Shape Reconstruction Using Phase-Shifting Grating Projection Moire Method (위상천이 영사식 모아레법을 이용한 고속 3차원 형상복원)

  • 최이배;구본기;정연구
    • Proceedings of the Korean Society for Emotion and Sensibility Conference
    • /
    • 1998.11a
    • /
    • pp.111-115
    • /
    • 1998
  • A phase-shifting projection moire method particularly intended for high-speed three-dimensional shape reconstruction of diffuse objects is presented. Emphasis is on realization of phase-shifting fringe analysis in projection moire topography using a set of line grating pairs designed to provide different phase shifts in sequence. Further a time-integral fringe capturing scheme is devised to remove undesirable high frequency original grating patterns in real-time without time-consuming software image processing. Finally the performances of the proposed method are discussed with measurement results.

  • PDF