• 대한치과교정학회지
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• 제45권3호
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• pp.105-112
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• 2015

Objective: A recently developed facial scanning method uses three-dimensional (3D) surface imaging with a light-emitting diode. Such scanning enables surface data to be captured in high-resolution color and at relatively fast speeds. The purpose of this study was to evaluate the accuracy and precision of 3D images obtained using the Morpheus 3D$^{(R)}$ scanner (Morpheus Co., Seoul, Korea). Methods: The sample comprised 30 subjects aged 24.34 years (mean $29.0{\pm}2.5$ years). To test the correlation between direct and 3D image measurements, 21 landmarks were labeled on the face of each subject. Sixteen direct measurements were obtained twice using digital calipers; the same measurements were then made on two sets of 3D facial images. The mean values of measurements obtained from both methods were compared. To investigate the precision, a comparison was made between two sets of measurements taken with each method. Results: When comparing the variables from both methods, five of the 16 possible anthropometric variables were found to be significantly different. However, in 12 of the 16 cases, the mean difference was under 1 mm. The average value of the differences for all variables was 0.75 mm. Precision was high in both methods, with error magnitudes under 0.5 mm. Conclusions: 3D scanning images have high levels of precision and fairly good congruence with traditional anthropometry methods, with mean differences of less than 1 mm. 3D surface imaging using the Morpheus 3D$^{(R)}$ scanner is therefore a clinically acceptable method of recording facial integumental data.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2001년도 학술발표회 논문집(Proceedings of the Korean Textile Conference) 상
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• pp.247-250
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• 2001

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.1427-1429
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• 2003

In our contribution, the new idea of parking/moving discrimination is proposed by using Three Line Scanner Imagery. The framework of our study consists of three main stages: preprocessing, vehicle detection and parking/moving detection respectively. First two stages of framework have been done in our previous work. Parking/ Moving Discrimination algorithm have been developed by using generic vehicle characteristics and some principle of photogrammetry. By using detected vehicles from our previous work, stopping/moving vehicles are able to discriminate. Moving vehicle is detected by detecting generic moving vehicle in TLS, inter-band gap. Stopping vehicle is verified by 3 dimensional viewing of Stereoscopic measurement. Finally, the conceptual framework has been done and the result will been realized soon.

• 한국지능시스템학회논문지
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• 제23권6호
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• pp.539-544
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• 2013

본 논문에서는 다항식 기반 RBFNNs를 이용하여 3차원 얼굴인식 알고리즘을 설계하고 인식률을 산출하는 방법을 제시한다. 2차원 얼굴인식의 경우 얼굴 포즈, 조명 등과 같은 외부 환경에 의해 인식률이 저하된다. 이러한 단점을 보완하기 위해 3차원 영상을 획득하여 얼굴인식을 수행한다. 얼굴인식을 수행하기 전에 3D스캐너를 통해 얻은 얼굴영상의 포즈 보상을 실시하고 얼굴의 형상을 정면으로 향하게 한다. 그리고 Point Signature 기법을 이용하여 얼굴의 깊이 값을 추출하게 된다. 추출된 데이터는 고차원 데이터로서 학습 및 인식을 수행함에 있어 문제가 생길 수 있기 때문에 PCA알고리즘을 수행하여 차원을 축소한 데이터를 사용한다. 효율적인 학습을 위해 최적화 알고리즘을 통해 파라미터 최적화를 수행하며 PSO, DE, GA 알고리즘을 사용하여 인식 성능을 확인한다.

• Restorative Dentistry and Endodontics
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• 제24권1호
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• pp.129-135
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• 1999

In this review article, in vivo and in vitro wear test methods which measure the wear of tooth and restorative material were discribed. In vivo test, the criteria of each test were reviewed. The merits and limitations were also commented. In vitro tests, three dimensional scanning methods which scan the occlusal tooth surface three dimensionally were described. Profilometer method, Pin on disk method, laser scanner method were reviewed and the limitations of each test were commented. Additionally, the structer of the three dimensional scanner which has been developed in Zurich university and has been reputated as the most accurate one was described. This study was partly supported by 1997 post-doctoral foreign study program.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2001년도 추계학술대회(한국공작기계학회)
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• pp.375-380
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• 2001

This study is on the precision of the optical scanner which is suitable for shape modeling and non-contact equipment, comparing with a razer scanner. The optical scanner not only has all merits that non-contact methods have but also improve a veil phenomenon which is a razer scanner's demerits. However, the optical scanner has not been used extensively because the measurements are not very precise and there are not the definite methods of measurement. Hence, this study is to find out how parameters such as camera's hight, angle, luminous intensity, distance to object, and so on have an influence on measuring using the optical scanner and to establish the methods of measuring precision.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.1013-1017
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• 1997

This study is on the precision of the optical scanner which is suitable for shape modeling and non-contact equipment, comparing with a razer scanner. The optical scanner not only has all merits that non-contact methods have but also improve a veil phenomenon which is a razer scanner's demerits. However, the optical scanner has not been used extensively because the measurements are not very precise and there are not the definite methods of measurements, Hence, this study is to find out how parameters such as camera's hight, angle, luminous intensity, distance to object, and so on have an influence on measuring using the optical scanner and to establish the methods of measuring precision.

• 복식
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• 제55권5호
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• pp.55-64
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• 2005

The concern with three-dimensional measurement has been growing in recent years. And over the last few years, several studies have been made on three-dimensional measurement. Some of the studies using a three-dimensional measurement have focused on type of form of human body and evaluation of fitness. But there has been no study about applications of three-dimensional measurement system for shape analysis. So, the purpose of this study was to investigate about application of three-dimensional mea-surement system lot shape analysis. The instrument and tools for three-dimensional measurement was Whole Body 3D scanner(model name: Exyma-WBS2H). Analysis program used in experiment is Rapid Form 2004 PPI (INUS technology, Int, Korea). The following results were obtained; 1. The point data using three-dimensional measurement system built 3D model. 2. The three-dimensional data were used to analyze length and curvature of shape. 3. The shape using three-dimensional measurement system could be used in variety field.

• 한국가시화정보학회:학술대회논문집
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• 한국가시화정보학회 2004년도 Proceedings of 2004 Korea-Japan Joint Seminar on Particle Image Velocimetry
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• pp.1-13
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• 2004

A scanning stereo-PIV system was developed to measure the three-dimensional distribution of three-component velocity in a turbulent round jet. A laser light beam produced by a high repetition rate YLF pulse laser was expanded vertically by a cylindrical lens to form a laser light sheet. The light sheet is scanned in a direction normal to the sheet by a flat mirror mounted on an optical scanner, which is controlled by a programmable scanner controller. Two high-speed mega-pixel resolution C-MOS cameras captured the particle images illuminated by the light sheet, and stereoscopic PIV method was adopted to acquire the 3D-3C-velocity distribution of turbulent round jet in an octagonal tank filled with water. The jet Reynolds number was set at Re=1000 and the streamwise location of the measurement was fixed at approximately x = 40D. Time evolution of three-dimensional vortical structure, which is identified by vorticity, is visualized. It revealed that the existence of a group of hairpin-like vortex structures was quite evident around the rim of the shear layer of the jet. Turbulence statistics shows good agreement with the previous data, and divergence of a filtered (unfiltered) velocity vector field was $7\%\;(22\%)$ of root-me an-squared vorticity value.

• 대한치과재료학회지
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• 제45권4호
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• pp.287-300
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• 2018

본 연구의 목적은 3차원 스캐너를 이용하여 현재 시판중인 두 종류의 대구치용 기성금속관의 형태적 특성을 비교하는 것이며, 또한 crimping 후의 치경부측 형태 변화를 분석 후 비교하는 것이다. 3차원 스캐너를 이용하여 상, 하악 대구치용 기성금속관인 PO-96과 PERMACROWN의 크기, crown index, 치경부 수렴도를 계측하였다. 이후 기성금속관들은 crimping을 통하여 치경부 형태를 조정하였고 3차원 스캐너를 통해 다시 스캔을 시행한 후 형태적 변화를 분석하였다. 상악 기성금속관의 폭경은 PERMACROWN이 PO-96에 비해 협설로 더 컸고 근원심으로는 더 작았으며, 치경부의 근원심 형태는 더 볼록하였다. 하악에서는 PERMACROWN이 PO-96에 비해 폭경은 협설로 작고 근원심으로 컸으며, 치경부의 근원심, 협설측 모두 더 볼록한 형태를 보였다. 그리고 두 기성금속관 모두 crimping 이후 치경부 변연 둘레는 감소하였다. 두 기성금속관은 크기, 형태, 치경부 수렴도에서 형태학적 차이를 보였다. 두 대구치용 기성금속관 모두 치경부 형태가 부여되어있지만 더 나은 변연적합을 위해서는 추가적인 crimping이 필요하다.