• 인터넷정보학회논문지
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• 제7권4호
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• pp.45-55
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• 2006

본 논문에서는 현장감 있는 모의훈련을 위해 가상영상이 아닌 지상기반 CCD 카메라영상에 지정된 시나리오대로 가상표적을 전시하는 방법을 제안한다. 이를 위해 고해상도 GeoTIFF(Geonraphic Tag Image File Format) 위성영상과 DTED(Digital Terrain Elevation Data)를 이용하여 현실감 있는 3차원 모델을 생성(운용자용)하고 입력된 CCD 영상(운용자 훈련자용)으로부터 도로를 추출하였다. 그러나 위성영상과 지상기반 센서영상은 관측위치, 분해능, 스케일 등에 많은 차이가 있어 특징기반 정합이 어렵다. 따라서 본 논문에서는 영상 워핑함수인 TPS(Thin-Plate Spline) 보간 함수를 일치하는 두 개의 제어점 집합에 적용하여 3차원 모델에 표시된 이동경로를 따라 CCD 영상에도 표적을 전시하는 이동 동기화 방법을 제안하였다. 실험에서는 대전지역의 위성영상과 CCD 영상을 이용하여 제안한 알고리즘의 유효성을 입증하였다.

• Journal of the Optical Society of Korea
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• 제6권4호
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• pp.156-160
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• 2002

In this paper, we propose an improved optical security system using three phase-encoded images and the principle of interference. This optical system based on a Mach-Zehnder interferometer consists of one phase-encoded virtual image to be encrypted and two phase-encoded images, en-crypting image and decrypting image, where every pixel in the three images has a phase value of '0'and'$\pi$'. The proposed encryption is performed by the multiplication of an encrypting image and a phase-encoded virtual image which dose not contain any information from the decrypted im-age. Therefore, even if the unauthorized users steal and analyze the encrypted image, they cannot reconstruct the required image. This virtual image protects the original image from counterfeiting and unauthorized access. The decryption of the original image is simply performed by interfering between a reference wave and a direct pixel-to-pixel mapping image of the en crypted image with a decrypting image. Computer simulations confirmed the effectiveness of the proposed optical technique for optical security applications.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1997년도 학술대회
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• pp.79-85
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• 1997

Virtual holography is a methodology of synthesizing apparent three-dimensional images from two-dimensional photographs. Since the input is photographic images of real objects, the degree of realism exceeds that offered by any computer-aided design software. The three-dimensional appearance is given in real-time by images from arbitrary viewing directions. If infinitely many photographs were taken and pasted together, virtual holography would have been trivial. But, the (infinite) storage requirement would prohibit such an attempt.

• Journal of information and communication convergence engineering
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• 제8권6호
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• pp.690-696
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• 2010

Web-based virtual collaboration is increasingly gaining popularity in almost every area in our society due to the fact that it can bridge the gap imposed by time and geographical constraints. However, in medical field, such collaboration has been less popular than other fields. Some of the reasons were timeliness, security, and preciseness of the information they are dealing with. In this paper, we are proposing a web-based distributed medical collaboration system called Virtual Collaboration System for Medicine (VCSM) for medical doctors that meet the needs. The proposed system consists of two parts - multimedia presentation and recordable virtual collaboration. The former supports synchronized multimedia presentation using Synchronous Multimedia Integration Language (SMIL.) It allows synchronization of the contents of a PowerPoint presentation file and a video file. The presentation may be provided to the participants before the discussion begins. Next, in the virtual collaboration stage, participants can use text along with associated symbols during the discussion over the presented medical images. The symbols such as arrows or polygons can be set or removed dynamically to represent areas of interest in digital images using so called layered architecture that separates image layer from annotation layer. XML files are used to record participants' opinions along with the symbols over some particular images

• 대한의용생체공학회:의공학회지
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• 제25권2호
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• pp.103-109
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• 2004

가상 관절경은 무릎, 어깨 둥 관절에 대한 단층촬영 영상으로부터 관절 내부의 해부학적 구조를 3차원으로 재구성함으로써 광학 관절경을 모사 하는 기법이다. 이 논문에서는 볼륨 렌더링 기법의 일종인 등위면 광선투사법을 이용하여 3차원 영상을 신속하게 생성하는 가상 관절경 기법을 제안한다 여기서 제안하는 등위면 광선투사법은 최대-최소맵을 이용하여 전처리 과정 없이도 실시간에 가까운 속도로 고화질의 영상을 얻을 수 있다. 또한 물리 기반 카메라 제어 모델을 이용함으로써 사용자가 복잡한 해부구조를 가진 관절강 내부에서 가상 카메라를 자유롭게 이동시킬 수 있다. 이러한 고속 렌더링 방법과 현실감 있는 카메라 제어기법을 이용하여 대화식 가상 관절경을 개발하였다.

• International Journal of Advanced Culture Technology
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• 제11권1호
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• pp.45-54
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• 2023

The digital age start in earnest with the widespread use of the Internet. As a digital product, virtual idols bring new value to the design and dissemination of commercial brand images. "Luo Tianyi" is the world's first avatar and VOCALOID voice bank of Chinese. It has a large number of fans in China and is widely used in brand promotion. Therefore, "Luo Tianyi" is taken as the research object. Initially, we investigated the virtual idols through books, literature on the internet and other materials. Then we discussed semiotics and theories related to culture code brand design methodology (CCBD). After that, putting the above theories into practice, combined with brand design cases, we analyzed the strategy of virtual idols in brand promotion and dissemination, at last, we have the conclusion as followed. The results show that the virtual idols, visual symbol of "Luo Tianyi" can express the Index and Symbol corresponding to the brand information according to the characteristics of the brand. As an image of cultural code, "Luo Tianyi" can present three visual images at the same time, which are contemporary, traditional and future. In addition, these three visual images are presented in a strong and weak combination, which has a positive impact on the visual communication of the brand.

• 한국광학회:학술대회논문집
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• 한국광학회 2003년도 제14회 정기총회 및 03년 동계학술발표회
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• pp.56-57
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• 2003

We propose the encrytion method using visual cryptography and virtual phase images. The decryption is able to be performed when anyone got all of the keys. Original information is extracted by using Mach-Zehnder interferometer.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1996년도 Proceedings International Workshop on New Video Media Technology
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• pp.35-40
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• 1996

In this paper, a method for 3-D surface reconstruction with two real cameras is presented. The method, which combines the extraction of binocular disparity and its interpolation can be applied to the synthesis of images from virtual viewpoints. The synthesized virtual images are as natural as the real images even when we observe the images as stereoscopic images. The method opens up many applications, such as synthesizing input images for multi-viewpoint 3-D displays, enhancing the depth impression in 2-D images and so on. We also have developed a video-rate stereo machine able to obtain binocular disparity in 1/30 sec with two cameras. We show the performance of the machine.

• 복식
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• 제66권7호
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• pp.154-170
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• 2016

The female leadership styles in the 21st century have been established as a major axis. Especially, the fashion of female politicians being exposed to the public during political activities has become a main element of a measure displaying visually female leadership styles in the 21st century and image making as well. Consequently, this study conducted qualitative research through the interview method to figure out regular voters' thoughts in depth about images being required for female political leaders and the fashion maximizing those images, and drew the detailed design elements. Suggesting the clothes design reflecting those elements for female political leaders by 3D virtual clothing works emerging as a new market creating profits related to fashion. The images which female political leaders have to have and were extracted through the interviews in this study, showed as feminine, strong leader, honest, and intelligent images, and also it was shown that female political leaders displaying proper images depending on the circumstances and using those images in politics rather than sticking to a fashion identity were favored by interviewees. The present study intends to contribute to being used as basic data of various research and fashion items of virtual reality and establishment of successful fashion strategy for female political leaders.

• 대한소아치과학회지
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• 제49권1호
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• pp.57-64
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• 2022

콘빔 전산화 단층촬영(CBCT)은 치열을 왜곡시켜 추가 치열 이미지가 필요하다. 치열 이미지로 주로 사용되는 석고 모형을 대신해 구강 스캐너로 CBCT의 치열 이미지를 보완할 때의 임상적 활용 가능성을 평가하였다. 만 12 - 18세의 20명에게 상악에 대한 석고 모형, 구강 스캔 이미지, CBCT이미지를 획득하였다. 비교를 위해 두 종류의 구강 스캐너를 이용하였는데, 그 중 하나의 구강 스캐너로는 전악을 3분할하여 각각을 스캔한 후 이들을 병합해 전악 이미지를 획득하는 방법을 추가로 시행하였다. 구강 스캐너를 이용해 얻은 가상 골격-치열 하이브리드 이미지를 석고 모형을 통해 얻은 이미지와 중첩하여 각 기준점에서의 좌표 값의 차이와 거리를 측정하였다. 결과적으로 구강 스캐너로 분할하여 스캔하는 방법을 시행했을 때 평균 거리 2 ㎛를 보여 가장 적게 나타났다. 구강 스캐너를 적절히 이용하면 가상 골격-치열 하이브리드 이미지를 위한 치열 이미지로 훌륭히 활용될 수 있을 것이다.