• 대한의용생체공학회:의공학회지
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• 제39권4호
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• pp.153-160
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• 2018

3D ultrasound bladder scanners are getting popular in hospitals for the patients with bladder dysfunction. A current bladder scanner adopts a mechanical scan to acquire 3D images and requires two motors and complicated mechanical devices. In this paper, we propose a new ultrasound bladder scanner using hand-motion scan. Instead of two motors and mechanical devices, it has a motion sensor to record transducer positions during hand-motion scan. The experiments with a bladder phantom and volunteers showed similar measurement accuracy to a conventional 3D ultrasound bladder scanner. We expect that the proposed method will reduce the cost and size of the bladder scanner.

• 복식
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• 제53권5호
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• pp.1-12
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• 2003

This paper proposes a system for measuring the 3D human bodies using the multiple 2D images. The system establishes the multiple image input circumstance from the digital camera for image measurement. The algorithm considering perspective projection leads us to estimate the 3D human bodies from the multiple 2D images such as frontal. side and rear views. The results of the image measurement is compared those of the direct measurement and the 3D scanner for the total 40 items (12 heights, 15 widths and 13 depths). Three persons measure the 40 items using the three measurement methods. In comparison of the results obtained among the measurement methods and the persons, the results between the image measurement and the 3D scanner are very similar. However, the errors for the direct measurement are relatively larger than those between the image measurement and the 3D scanner. For example, the maximum errors between the image measurement and the 3D scanner are 0.41cm in height, 0.39cm in width and 0.95cm in depth. The errors are acceptable in body measurement. Performance of the image measurement is superior to the direct. because the algorithm estimates the 3D positions using the perspective projection. In above comparison, the image measurement is expected as a new method for measuring the 3D body, since it has the various advantages of the direct measurement and 3D scanner in performance for measurement as well as in the devices, cost, Portability and man power.

• 한국콘텐츠학회논문지
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• 제15권10호
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• pp.587-596
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• 2015

3차원 스캐너는 실제 대상을 손쉽게 디지털화한다는 점에서 제조업, 건설업, 조선업 등 여러 산업분야에 적용되고 있으며, 최근에는 토공 중장비의 자동제어 및 가이던스를 위한 기초자료 제공을 위해 토공현장을 3차원 이미지화하는 작업에 사용되고 있다. 본 연구에서는 토공현장의 정밀계측과 최근에 주목받고 있는 3차원 고해상도 레이져 스캐너의 정밀도 및 생산성을 비교하였다. 그 결과, 정밀도 측면에서 중해상도와 고해상도 스캔을 통해 얻은 데이터 값이 토탈스테이션을 통해 정밀 측정한 데이터의 좌표와 비교하여 99% 이상의 정밀도를 나타내었으며, 평균 2.0mm이내의 오차가 발생하는 것으로 분석되어 높은 정밀도를 보였다. 생산성 측면에서는 단순 타겟당 소요시간 비교를 통해 중해상도 스캔시 토탈스테이션을 이용한 정밀측정에 비해 71%의 시간절감효과가 있는 것으로 나타났다. 본 연구를 통해 3차원 스캐너를 활용하여 토공현장을 측량하는 것이 우수한 정밀도와 높은 생산성을 발휘하는 것을 확인할 수 있다.

• 한국CDE학회논문집
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• 제16권1호
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• pp.11-20
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• 2011

A structured beam laser is often used to scan object and make 3D model. Multiple cameras are inevitable to see occluded areas, which is the main reason of the high price of the scanner. In this paper, a low cost 3D foot scanner is developed using one camera and two mirrors. The camera and two mirrors are located below and above the foot, respectively. Occluded area, which is the top of the foot, is reflected by the mirrors. Then the camera measures 3D point data of the bottom and top of the foot at the same time. Then, the whole foot model is reconstructed after symmetrical transformation of the data reflected by mirrors. The reliability of the scan data depends on the accuracy of the parameters between the camera and the laser. A calibration method is also proposed and verified by experiments. The results of the experiments show that the worst errors of the system are 2 mm along x, y, and z directions.

• 한국측량학회지
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• 제39권5호
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• pp.343-349
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• 2021

In The process from design to construction in the existing construction work was less efficient due to the contradictory approach of identifying the 3D state in the plan view and the repeated generation of surveys, floor plans, drawings. Accurate 3D design data is essential for smart construction. However, most of the existing related studies have focused on explaining the development method and main functions of equipment or improving the productivity of smart construction. Therefore, in this study, the utility of 3D design model generation for smart construction and construction survey using 3D laser scanner was evaluated. Plane and vertical road alignment were created using the specifications of the road. The generated road alignment was created as a three-dimensional corridor design using cross-sections at intervals of 20m. In addition, it was possible to create a DTM (Digital Terrain Model) using a digital map and effectively create a 3D design model for the study area through overlapping. Construction survey using a 3D laser scanner showed accuracy within 10cm as a result of the accuracy evaluation. These results proved that construction surveying using a 3D laser scanner is possible because it satisfies the acceptable accuracy of the relevant regulations modeling of target areas using 3D design and construction survey using 3D laser scanner can be a way to address shortcomings of existing GNSS (Global Navigation Satellite System) methods. And accurate 3D data will be used as essential data as basic data for smart construction.

• 패션비즈니스
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• 제24권1호
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• pp.102-116
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• 2020

After its introduction in Korea, nail art is becoming active, especially among women in their 20s and 30s who are interested in fashion and beauty. Although self-nail tips are available online in various designs for each brand that is currently on the market, these designs and sizes of self-nail tips on the market are different for each age group. Since the design or size is not suggested for the different situations, there are difficulties in purchasing products that match the shape and size of nails of consumers. In this study, frequency analysis was performed using 'SPSS statistics 21.0 for windows program' to analyze data obtained by direct measurement method and 3D scanner measurement method for Korean women in their 20s. For comparative analysis between direct and 3D scanner measurements, a corresponding sample, 'T-test', was performed. As a result, we proposed the standardization of nail tip size after comparative analysis between direct measurement and 3D scanner measurement. Previous studies have been proceeding with direct measurement method. However, this study introduced a 3D scanner measurement method in the nail field and attempted the standardization of nail size by age group of Korean women. Importantly, this sutdy suggests standardization of nail tip size among missing body sizes.

• 지질공학
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• 제27권2호
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• pp.119-124
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• 2017

대규모 불연속면의 굴곡도는 암반의 안정성을 판단하는 중요한 요소 중 하나이다. 그러나, 주로 실시하는 불연속면의 굴곡도 측정시험은 대형암반의 작은 코어를 채취하여 채취한 작은 코어의 굴곡도에 계수를 사용하여 대형 암반의 굴곡도를 환산하고 있다. 이러한 점을 보완하고자 3D Laser Scanner를 사용하여 대규모 불연속면의 굴곡도를 직접 측정하는 방안에 대해 연구를 수행하였다. 본 연구에서는 3D Laser Scanner를 이용하여 실제 X,Y,Z의 좌표를 가지는 3D 모델을 구축하였고, CAD 프로그램을 사용하여 대규모 불연속면의 굴곡도를 산정한 데이터와 현장에서 Disc-Clinometer로 측정한 Data 결과를 비교 분석 하였다. 그 결과 Mean Dip과 Mean I 측정결과 모두 $1^{\circ}$ 이내로서 측정 장비의 기계오차 $1{\sim}2^{\circ}$ 사이에 속 하기 때문에 3D Laser Scanner를 이용한 데이터 취득 및 분석은 기존의 조사법을 보완할 수 있는 효율적이고 신뢰성 있는 조사법이라고 분석되었다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.301-303
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• 2003

The extraction of 3D road network from high-resolution aerial images is still one of the current challenges in digital photogrammetry and computer vision. For many years, there are many researcher groups working for this task, but unt il now, there are no papers for doing this with TLS (Three linear scanner), which has been developed for the past several years, and has very high-resolution (about 3 cm in ground resolution). In this paper, we present a methodology of road extraction from high-resolution digital imagery taken over urban areas using this modern photogrammetry’s scanner (TLS). The key features of the approach are: (1) Because of high resolution of TLS image, our extraction method is especially designed for constructing 3D road map for next -generation digital navigation map; (2) for extracting road, we use the global context of the intensity variations associated with different features of road (i.e. zebra line and center line), prior to any local edge. So extraction can become comparatively easy, because we can use different special edge detector according different features. The results achieved with our approach show that it is possible and economic to extract 3D road data from Three Linear Scanner to construct next -generation digital navigation road map.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.854-861
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• 2005

Studied accuracy and practical use possibility of joint measurement that using 3D laser scanner to rock slope. Measured joint of Rock slope and comparison applied 3 dimension laser scanner and clinometer. 3D laser scanning system preserves on computer calculating to 3 dimension coordinate scaning laser to object. and according to laser measurement method of interior, produce correct vector value from charge-coupled device(CCD) or laser reciver and telegram register and time measuring equipment. Create of object x, y, z point coordinates to 3 dimension space of computer. Such 3 dimension point datum (Point Clouds) forms relocate position informations that exist to practical space to computer space. Practical numerical values related between each other. Compared joint distribution and direction that measured by laser scanner and clinometer. By the result, Distribution of joint projected almost equally. Could get more joint datas by measurement of 3 dimension scanner than measured by clinometer. Therefore, There is effect that objectification of rock slope investigation data, shortening of investigation periods, investigation reduction of cost. could know that it is very effective method in joint measuring.

• 한국의류산업학회지
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• 제6권6호
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• pp.749-755
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• 2004

This paper was conducted to compare the methods of women's basic pattern and the problems by analyzing the space between skin and clothing using 3D scanner and thereupon, proposed the solutions. The Bunka pattern of Japan Bunka Women's University(Bunka) and the Secoli pattern of Italy istituto carlo secoli(Secoli) were used. The subject who has nearly the same body size with N type of National anthropometric survey of Korea in 1997 was picked out. In the result of analyzing the space between skin and clothing of each pattern by 3D Scanner, there exist significant differences in the chest and bust parts. The Bunka has more space than the Secoli at bust part, especially between bust points. Because the Bunka has the bust dart which was made from only the bust girth, it couldn't reflect the difference of each human body. Whereas the Secoli has the bust dart which gave a consideration the difference between the bust girth and the chest girth, it has more even space between skin and clothing.