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라인 레이저 기반 3차원 스캐너에서 투영을 이용한 고속 3D 메쉬 생성
이경미,유훈,Lee, Kyungme,Yoo, Hoon 한국정보통신학회 2016 한국정보통신학회논문지 Vol.20 No.3
본 논문은 라인 레이저 기반 3차원 스캐너에서 투영을 이용한 고속 메쉬 생성 방법을 제안한다. 3차원 공간에서의 메쉬를 생성하기 위한 가장 알려진 방법은 3차원의 점을 4차원으로 변환하고 4차원 컨벡스 헐(convex hull)을 구축하는 방법을 활용한다. 이런 방법은 많은 수의 점 데이터를 가지는 3D 스캔 결과에서는 메쉬를 만들 때 시간이 많이 요구된다. 제안하는 방법에서는 라인 레이저 스캐너에서 중간에 얻어지는 (${\theta}$, y, z)축의 점 정보를 투영하여 얻어진 (${\theta}-y$) 2차원 깊이 지도를 메쉬 생성에 활용한다. 제안된 방법은 2D 영역에서 수행되기 때문에 메쉬를 구성하는 시간이 상당히 단축된다. 제안하는 방법을 평가하기 위해서 라인 레이저 기반 스캐너의 중간 데이터를 이용하여 실험을 진행하였다. 실험 결과는 제안된 방법이 기존방법보다 고속 메시 생성에서 우수함을 보여준다. This paper presents a fast 3D mesh generation method using projection for line laser-based 3D scanners. The well-known method for 3D mesh generation utilizes convex hulls for 4D vertices that is converted from the input 3D vertices. This 3D mesh generation for a large set of vertices requires a lot of time. To overcome this problem, the proposed method takes (${\theta}-y$) 2D depth map into account. The 2D depth map is a projection version of 3D data with a form of (${\theta}$, y, z) which are intermediately acquired by line laser-based 3D scanners. Thus, our 2D-based method is a very fast 3D mesh generation method. To evaluate our method, we conduct experiments with intermediate 3D vertex data from line-laser scanners. Experimental results show that the proposed method is superior to the existing method in terms of mesh generation speed.
초등학교 저학년 영어교육에 관한 학생과 학부모의 인식 연구
이경미 ( Lee Kyungmee ),박선호 ( Park Seon-ho ) 글로벌영어교육학회(구 호남영어교육학회) 2018 Studies in English education Vol.23 No.1
This study investigates how students and their parents perceive issues related to teaching English to primary school first and second graders. The participants were 163 primary school students and 119 parents from three regions in Korea: Seoul, Gyeonggi, and Incheon. They responded respectively to the survey questions provided in slightly differentiated types, one for students and the other for parents. Nearly 80% of the students had English learning experience before entering the primary school and about 55% of them experienced English learning through the regular curriculum at their kindergarten or day care center. About 48% of the students and 44% of the parents agreed with teaching English to the lower grades at primary school. More than half of the students disagreed that learning English would interfere with learning Korean. Both students and parents preferred the Creative Exercise class as a way for offering early English education. Slightly more than 70% of the students preferred their homeroom teacher as an English teacher. Based on these results, implications are discussed and a few suggestions are made for policy making regarding teaching English to the lower grade classes at primary schools in Korea.
장서각 소장 『禮服』의 서술체계와 근대 복식 사료로서의 특징
이경미(Kyungmee Lee) 아시아민족조형학회 2020 아시아민족조형학보 Vol.21 No.-
This study reviews the description system, refers to or quotes literature, and examines the details focusing on the table of contents of “Yebok”(the name of the book, same as below), which is the only version of Jangseogak. “Yebok,” an organized literature by the ceremonial department of Yiwangjik (李王職), is presumed to be made in the periods after February in 1920 because Daehaedangnap, a printing house established at that time, printed it. The results of this study are as follows. First, “Yebok” consists of three parts: the table of Yebok (formal dress, same as below), the chapter of literature, and the chapter of graphics. The table of Yebok arranged the traditional items of the Yebok of Joseon, corresponding to court dress (大禮服) and formal dress (小禮服) in Western culture, by class and gender under the King and Queen. The chapter of literature and the chapter of graphics, which are composed of current Yebok (現行禮服), designated Yebok in the first year of Gwangmu (the King Gojong) (光武元年始定禮服), private Yebok (民禮服), and organized Yebok system by class in verifying related references. Second, the primary reference of “Yebok” was Jeungbomoonheonbigo (增補文獻備考), and Joseonwangjosilrok (朝鮮王朝實錄), Yookjeonjorye (六典條例), Daejeonhoetong (大典會通), Daemyonghoejeon (大明會典) were cited additionally. Details of the original literature were rearranged or summarized beyond exact citation. Third, “Yebok” has the characteristic of modern costume materials, in terms of reorganizing the costume of Joseon as a Western formal dress system including court dress and formal dress. It summarized the costume of Joseon classified by wearing occasions, and it summed up private Yebok (民禮服). Therefore, “Yebok” means reorganizing traditional formal dress and enabling sharing with a Western formal dress.
단일 레이저 포인터를 이용한 저복잡도 휴대형 3D 스캐너
이경미(Kyungme Lee),이연경(Yeonkyung Lee),박도영(Doyoung Park),유훈(Hoon Yoo) 대한전기학회 2015 전기학회논문지 Vol.64 No.3
This paper proposes a portable 3-D scanning technique using a laser pointer. 3-D scanning is a process that acquires surface information from an 3-D object. There have been many studies on 3-D scanning. The methods of 3-D scanning are summarized into some methods based on multiple cameras, line lasers, and light pattern recognition. However, those methods has major disadvantages of their high cost and big size for portable appliances such as smartphones and digital cameras. In this paper, a 3-D scanning system using a low-cost and small-sized laser pointer are introduced to solve the problems. To do so, we propose a 3-D localization technique for a laser point. The proposed method consists of two main parts; one is a fast recognition of input images to obtain 2-D information of a point laser and the other is calibration based on the least-squares technique to calculate the 3-D information overall. To verified our method, we carry out experiments. It is proved that the proposed method provides 3-D surface information although the system is constructed by extremely low-cost parts such a chip laser pointer, compared to existing methods. Also, the method can be implemented in small-size; thus, it is enough to use in mobile devices such as smartphones.
육각형 구조의 베이어 컬러 필터 배열에 대한 디모자익킹
이경미(Kyungme Lee),유훈(Hoon Yoo) 대한전기학회 2014 전기학회논문지 Vol.63 No.10
This paper describes a demosaicking method for hexagonally-structured color filter array. Demosaicking is essential to acquire color images using color filter array (CFA) in single sensor imaging. Thus, CFA patterns have been discussed in order to improve image quality in single sensor imaging after the Bayer pattern are introduced. Advancements in imaging sensor technology recently introduce a hexagonal CFA pattern. The hexagonal CFA can be considered to be a 45-degree rotational version of the Bayer pattern, thus demosaicking can be implemented by an existing method with backward and forward 45-degree rotations. However, this approach requires heavy computing power and memory in image sensing devices because of the image rotations. To overcome this problem, we proposes a demosaicking method for a hexagonal Bayer CFA without rotations. In addition, we introduce a weighting parameter in our demosaicking method to improve image quality and to unifying exiting method with our method. Experimental results indicate that the proposed method is superior to conventional methods in terms of PSNR. In addition, some optimized values for the weighting parameter are provided experimentally.