• Title/Summary/Keyword: moire detection

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Application of 3-Dimensional MOIRE Topography to the School Screening Program for Adolescent Scoliosis (모아레 체형측정법이 청소년기 척추측만증의 조기집단검진 활용 가능성에 대한 평가)

  • Han, Myeng-Gum;Shin, Byung-Cheul
    • The Journal of Korea CHUNA Manual Medicine
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    • v.4 no.1
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    • pp.1-16
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    • 2003
  • Objectives : The purpose of this study is researching for possibility that Moire topography be applied in group school screening for scoliosis known school health problem, and find acceptable method of early detection and early treatment for scoliosis Methods : The authors practiced Moire topography for primary & middle school 1,895 students[male 976, female 919] in Jeonju, korea in 2001. After we distinguished students who had abnormal finding in Moire topography and then re-examined spinal X-ray analysis. The data was analysed and evaluated statistically Results : According to this research, the abnormal finding in Moire topography was 53.7% (1,018 students), and students needed X-ray re-examination were 11.2% (213 students). Students diagnosed scoliosis by X-ray re-examination were 1.8%. According to statistical analysis, interval between vertical base line of pelvis and vertical base line of neck, gap between left distance and right distance to the vertical base line of pelvis and difference of contour lines have strong correlations with deformity degree of the body surface examined by Moire. Conclusions : Following this research, throughout early detection for scoliosis by Moire topography could reduce exposure from scoliosis radiographs, and could detect trunk asymmetry that couldn't be found existing X-ray examination, so it made selecting students under observation who have bad posture possible.

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Spinal Deformity Detection Based on the Evaluation of Middle Line´s Displacement on a Moire Image of a Human Back

  • Kim, Hyoungseop;Seiji Ishikawa;Yoshinori Otsuka;Hisashi Shimizu;Takashi Shinomiya
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.105.1-105
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    • 2001
  • In this paper, a technique is described for classifying normal cases and abnormal cases in automatic spinal deformity detection by computer based on moire topographic images of human backs. Displacement is evaluated statistically between the middle line extracted from the entire moire image and the middle line obtained from a small rectangle area defined on the moire image. The middle line is calculated employing a developed potential symmetry analysis technique. The displacement is calculated in several regions and the mean and the standard deviation of the displacement values are chosen as two features. A linear discriminant function (LDF) is defined on the 2-D feature space based on the Mahalanobis distance and the features are classified into two categories, i.e., normal and ...

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Recognizing asymmetric moire patterns for human spinal deformity detection

  • Kim, Hyoung-Seop;Hiroshi UENO;Seiji ISHIKAWA;Yoshinori Otsuka
    • 제어로봇시스템학회:학술대회논문집
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    • 1997.10a
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    • pp.568-571
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    • 1997
  • Recently, the number of techniques for analyzing medical images has been increasing in computer vision, employing X-ray CT images, ultrasound images, MR images, moire topographic images, etc. Spinal deformity is a serious problem especially for teenagers and medical doctors inspect moire topographic images of their backs visually for the primary screening. If a subject is normal, the moire image is almost symmetric with respect to the middle line of the subject's back, otherwise it shows asymmetric shape. In this paper, an image analysis technique is described for discriminating suspicious cases from normal in human spinal deformity by recognizing asymmetric moire images of human backs. The principal axes which are sensitive to asymmetry of the moire image are extracted at two parts on a subject's back and their angles are evaluated with respect to the detected middle line of the back. The two angles compose a 2-D feature space and inspected cases are divided into two clusters in the space by a linear discriminant function based on the Mahalanobis distance. Given 120 cases, 60 normal and 60 abnormal, the leave-out method was applied for the recognition and 75% recognition rate was achieved.

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Visual Measurement of Rotational Displacements by Using Two Different Moire Fringes Simultaneously Generated by Repeated Sinusoidal Gratings (반복사인격자에서 동시에 생기는 두 가지 무아레 무늬를 이용한 회전변위의 가시적 측정)

  • Jeong, Youn-Hong;Oh, Jeong-Hyo;Jo, Jae-Heung
    • Korean Journal of Optics and Photonics
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    • v.19 no.4
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    • pp.302-309
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    • 2008
  • We present the precise visual measurement method of rotational displacements using two different moire fringes simultaneously generated by repeated sinusoidal gratings. We investigate the variation of moire fringes depending on rotational displacements through computer simulation and experiment using a rotator in detail. The moire fringes are composed of the wide linear fringe part with a long period and the narrow linear fringe part with a short period. These parts are superior to the angle detection of more than 12 degrees and less than 12 degree, respectively. Additionally, the method can be visually used in the determination of the rotational direction by observing the moire fringe's direction.

The Factors Causing Change of Lifestyle by the Outcome of Oriental Medical Examination (한방건강검진(韓方建康檢診) 결과(結果)에 따른 생활행동(生活行動) 변화(變化)에 영향(影響)을 미치는 요인(要因))

  • Na Sam-Sik;Kwon So-Hui;Seo Ji-Yeon;Jung Hae-Kyoung;Kim Yoo-Chul;Song Yung-Sun;Jang Du-Seop;Lee Ki-Nam
    • Journal of Society of Preventive Korean Medicine
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    • v.7 no.1
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    • pp.139-150
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    • 2003
  • This study tried to know the chang of lifestyle and the factors causing of lifestyle change by the outcome of oriental medical examination for labors in one of the automobile factories in Jeon Buk area. The results will be helpful to the effective health care for the labors in factory. Oriental medical examination was done 22 times from May 20 to June 19, 2002. The numbers of labor who received oriental medical examination were 531, and 300 questionnaires among them were collected. The results were as follows: 1) General characteristics of examinee for oriental medical examination; total 300 labors, high percentage in age range $31{\sim}45$ years old, mostly married, high percentage of high school in completion of study. High percentages in drinking, smoking, and working hour were less than 1 time per week, non-smoking, and above 10 hours, respectively. High percentages in working year and salary were $11{\sim}15$ years. 2) The degree of lifestyle change by the oriental medical examination had the highest score with consult of oriental medicine doctor, and the lowest score was from moire typography result. 3) The degree of lifestyle change by medical examination was highly influenced by the subject characteristics that were less than 1 time per week for drinking, non-smoking, and less than 10 years of working year. 4) For the lifestyle change by the cognition of subject, the subjects who had high confidence for oriental medical examination, high recognition for oriental medical examination's requirement, high concern for health. effective cognition for early detection of disease, had high degree of lifestyle change. 5) The variables that cause lifestyle change in Sasang constitutional analysis result were early detection of disease, type of smoking, working year, moire typography result, interview for health. The variables that cause lifestyle change in moire typography result were type of drinking, ages, working year, consult for health, moire typography result. The variables that cause lifestyle change in interview with oriental medicine doctor were constitutional analysis and moire typography result.

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Moire Reduction in Digital Still Camera by Using Inflection Point in Frequency Domain (주파수 도메인의 변곡점을 이용한 디지털 카메라의 moire 제거 방법)

  • Kim, Dae-Chul;Kyung, Wang-Jun;Lee, Cheol-Hee;Ha, Yeong-Ho
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.1
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    • pp.152-157
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    • 2014
  • Digital still camera generally uses optical low-pass filter(OLPF) to enhance its image quality because it removes high spatial frequencies causing aliasing. However, the use of OLPF causes some loss of detail. On the other hand, when image are captured by using no OLPF, the moir$\acute{e}$ is generally existed in high spatial frequency region of an image. Therefore, in this paper, moir$\acute{e}$ reduction method in case of using no OLPF is suggested. To detect the moir$\acute{e}$, spatial frequency response(SFR) of camera was firstly analyzed by using ISO 12233 resolution chart. Then, moir$\acute{e}$ region is detected by using the patterns that are related to the SFR of camera. next, this region is analysed in the frequency domain. Then, the moir$\acute{e}$ is reduced by removing its frequency component, which represents inflection point between high frequency and DC components. Through the experimental results, it is shown that the proposed method can achieve moir$\acute{e}$ reduction with preserving the detail.

The review on the need for early screening of scoliosis (척추측만증 조기검진의 필요성)

  • Gong, Sang-Eun;Oh, Min-Seok
    • Journal of Haehwa Medicine
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    • v.20 no.1
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    • pp.137-142
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    • 2011
  • Objective : The purpose of this study was to review on the need for early screening of scoliosis. Methods : We have researched and analyzed theories and literatures of scoliosis screening program. Result : The following results were obtained in this study. 1. Scoliosis screening should be carried out to improve middle and high school students's health and learning abilities. 2. The methods are the forward bending test, Moire test and X-Ray. 3. After the examination held by differentiating the degree of scoliosis, surgery or brace treatment for students should be carried out. 4. After the examination, appropriate acupuncture, exercise therapy and orthodontic treatment for students should be carried out. 5. Spinal health courses for young people should be held regularly to equip and encourage a healthy body and healthy mind and contribute to improve the learning efficiency. Conclusion : Scoliosis screening and early detection should be done in the Daejeon city middle school or high school students, and appropriate treatment should be performed as soon as possible.

Solder Region Detection and Height Calculation by the Characteristics and Phase Difference of the 3D Profiles in Moire Images (모아레 영상에서 3차원 형상정보의 특성과 위상차에 의한 솔더영역 검출 및 높이 계산)

  • Song, Jun Ho;Rhee, Eun Joo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.8
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    • pp.5269-5279
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    • 2014
  • The cause of defects in the PCB SMT assembly is mostly solder paste deposits. Conventional inspection methods for solder paste deposits suffer from slow speed, low reliability and high cost. Therefore, this paper proposes a method for calculating the height and region of solder paste on PCB using the 3D profiles without measuring the 2D image. The solder paste region is detected by the phase difference in the measurement points and the average phase on the whole surface of PCB. The high reliable height of the solder paste region is computed by the average of the measurement points' phase with repeatability and reliability. The experimental results revealed improvements of 17% in inspection time and 29% repeatability in the height calculation of the solder paste region, resulting in a high speed and less expensive system.

A Study on Oriental Medical Diagnosis of Musculoskeletal Disorders using Moire Image (Moire 영상을 이용한 근골격계 질환의 한의학적 진단에 관한 연구)

  • Lee Eun-Kyoung;Yu Seung-Hyun;Lee Su-Kyung;Kang Sung-Ho;Han Jong-Min;Chong Myong-Soo;Chun Eun-Joo;Song Yung-Sun;Lee Ki-Nam
    • Journal of Society of Preventive Korean Medicine
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    • v.4 no.2
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    • pp.72-92
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    • 2000
  • This research has conducted studies on an Oriental medicine-based method of diagnosing of occupational musculoskeletal system diseases. This researcher has searched through existing relevant medical literature. Also, this researcher has worked on a moire topography using moire topography. In this course, this researcher has reached the following conclusion in relation to the possibility of using a moire topography as a diagnosing device of musculoskeletal system diseases under Oriental medicine . 1 The Western medicine outlines its criteria of screening occupational musculoskeletal system diseases as follows A. The occupational musculoskeletal diseases must clearly include one or more of the subjective symptoms characterized by pain, hypoesthesia dysaesthesia, anaesthesia. etc . B, There should be clinically admitted objective observations and diagnosis outlining that the disease concerned shows symptoms such as tenderness, induration. and edema that can appear with occupational musculoskeletal system diseases. dyscinesia should be admitted with the disease concerned, or there should be observations and diagnosis outlining that abnormality exists in electric muscular or nervous diagnosis and examination . C. It should be admitted that prior to the occurrence of symptoms or observations and diagnosis on musculoskeletal system-related diseases, a patient has been engaged in works with conditions requiring improper work posture or work movement. That is, this is an approach whereby they see abnormality in the musculoskeletal system come from material and structural defect, and adjust and control abnormality in the musculoskeletal system and secreta . 2. The Oriental medicines sees that a patient develops the pain of occupational musculoskeletal diseases as he cannot properly activate the flow of his life force and blood thus not only causing formation of lumps in the body and blocking the flow of life force and blood in some parts of the body. Hence, The Oriental medicine focuses on resolving the cause of weakening the flow of life force and blood, instead of taking material approach of correcting structural abnormality Furthermore , Oriental medicine sees that when muscle tension builds up, this presses blood vessels and nerves passing by, triggering circulation dyscrasia and neurological reaction and thus leading to lesion. Thus, instead of taking skeletal or neurophysiological approach. it seeks to fundamentally resolve the cause of the flow of the life force and blood in muscles not being activated. As a result Oriental medicine attributes the main cause of musculoskeletal system diseases to muscle tension and its build-up that stem from an individual's long formed chronicle habit and work environment. This approach considers not only the social structure aspect including companies owners and work environment that the existing methods have looked at, but also individual workers' responsibility and their environmental factors. Hence, this is a step forward method. 3 The diagnosis of musculoskeletal diseases under Oriental medicine is characterized by the fact that an Oriental medicine doctor uses not only photos taken by himself, but also various detection devices to gather information and pass comprehensive judgment on it. Thus, it is the core of diagnosis under Oriental medicine to develop diagnosing devices matching the characteristics of information to be induced and to interpret information so induced from the views of Oriental medicine. Diagnosis using diagnosing devices values the whole state of a patient and formal abnormality alike, and the whole balance and muscular state of a patient serves as the basis of diagnosis. Hence, this method, instead of depending on the information gathered from devices under Western medicine, requires devices that provide information on the whole state of a patient in addition to the local abnormality information that X-ray. CT, etc., can offer. This method sees muscle as the central part of the abnormality in the musculoskeletal system and thus requires diagnosing devices enabling the muscular state. 4. The diagnosing device using moire topography under Oriental medicine has advantages below and can be used for diagnosing musculoskeletal system diseases with industrial workers . First, the device can Provide information on the body in an unbalanced state. and thus identify the imbalance and difference of height in the left and right stature that a patient can not notice at normal times. Second, the device shows the twisting of muscles or induration regions in a contour map. This is not possible with existing shooting machines such as X-ray, CT, etc., thus differentiating itself from existing machines. Third, this device makes it possible for Oriental medicine to take its unique approach to the abnormality in the musculoskeletal system. Oriental medicine sees the state and imbalance state in muscles as major factors in determining the lesion of musculoskeletal system, and the device makes it possible to shoot the state of muscles in detail. In this respect, the device is significant. Fourth, the device has an advantage as non-aggression diagnosing device.

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A Proposal for Improvement of Detection of User Based on Facial Authentication Using Digital Projection Moire (디지털 영사식 무아레를 이용한 얼굴 인증 기반 출입자 탐지 개선 방법 제안)

  • Seo, Cho-Rong;Lee, Jeong-Pil;Lee, Keun-Ho;Jeon, You-Boo;Park, JinSoo
    • Proceedings of the Korea Information Processing Society Conference
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    • 2017.04a
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    • pp.366-367
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    • 2017
  • 생체인식 기술의 발달에 의해 생체 인증 수단 또한 늘어남에 따라 사용자의 얼굴을 이용한 인증방법이 점차 실용화 되어가고 있다. 그러나 주변 환경에 제약받을 경우 완벽한 인식률을 보여주지 못하는 경우가 발생한다. 본 논문에서는 기존의 얼굴인식 방법의 오탐지 부분에 대한 개선방법을 제안 하고자 하였다. 디지털 영사식 방법을 통한 무아레 현상을 얼굴인증에 접목시켜 보다 정확한 얼굴 인증을 진행할 수 있도록 개선된 인증 방법을 제시한다.