• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.800-806
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• 2006

최근, 컴퓨터 사이언스 분야에서 모자이크에 대한 다양한 연구들이 이뤄지고 있지만, 세부 묘사를 유지하려는 관점에서의 접근은 부족한 편이다. 본 논문은 원 영상의 세부 묘사를 유지하는 타일 모자이크 방법을 제안한다. 이 방법은 타일간의 빈 공간을 제거하기 위한 겹쳐진 타일의 사용을 통해 구현된다. 본 논문에서 제시한 방법은 다음 세 단계로 구성된다. 첫째, 에지 회피 기법이 적용된 무게중심 보로노이 다이어그램(CVD:Centroidal Voronoi Diagram)을 통해 메인 타일의 위치를 얻는다. 둘째, 메인 타일들의 위치에 딜로니 삼각형화(Delaunay Triangulation)를 적용해 서브 타일의 위치를 계산한다. 셋째, 타일간의 관계를 고려해 타일의 크기와 방향성을 구한다. 위의 과정을 통해 타일 간의 빈 공간이 최소화되어 세부 묘사가 강화된 모자이크 영상을 얻는다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.06a
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• pp.241-242
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• 2017

최근 영화, 광고, 미디어 전시 등의 분야에서 다양한 특수 효과가 처리된 장면의 연출이 적용되고 있다. 특히, 미디어 전시, 공연 등에서는 관객 혹은 공연자의 움직임에 반응하는 예술적 영상의 인터랙티브 표현들이 시도되고 있다. 이에 본 논문에서는 광고, 전시 등에서 효과적으로 활용될 수 있는 인터랙티브 포토 모자이크(photographic mosaic) 영상을 생성하는 시스템을 제안하였다.. 제안 시스템에서는 관객의 출현을 인지하고, 관객의 얼굴을 자동으로 캡쳐하여 관객의 얼굴 사진을 이용한 모자이크 영상을 실시간으로 생산한다. 이 때, 흥미 유발을 위하여 모자이크를 구성하는 관객의 얼굴 사진 조각들이 움직임을 가지는 작은 사각의 입자로 표현되어 서로가 충돌하며 자연스러운 움직임을 통하여 하나의 영상으로 맞춰가는 모습이 보여지도록 하였다.

• Proceedings of the Korea Database Society Conference
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• 1995.12a
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• pp.197-202
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• 1995

본 논문에서는 조명, 얼굴 개수 및 얼굴의 크기에 제한 받지 않고 복잡한 배경에서 얼굴 영역을 추출하는 알고리즘을 제안한다. 이 알고리즘은 3단계로 구성된다. 첫번째 단계는 입력 영상의 평균 그레이값을 계산하고 그 값이 임계치보다 작다면 히스토그램 균일화 작업을 수행한다. 두번째 단계에서는 입력 영상의 모자이크 이미지를 만들고 이 이미지에 대해 확장된 quartet을 만들고 실험을 통해 얻어진 규칙을 적용하여 대략적으로 얼굴의 후보 영역들을 추출한다. 이 작업은 모자이크 이미지를 구성하는 셀의 크기를 변화시킬 때마다 적용한다. 세번째 단계에서는 추출된 얼굴 후보 영역에 대해 Octet을 만들고 이 octet에 규칙을 적용하여 후보 영역에 대한 검증 작업을 수행한다. 세번째 과정에서 만들어진 모자이크 이미지는 두 번째 과정에서 얻어진 이미지보다 더 세밀하게 얼굴의 특징들을 표현하고 검증한다.

• Journal of the Korea Computer Graphics Society
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• v.14 no.1
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• pp.17-25
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• 2008

We proposed the method for photomosaic generation using a programmable GPU. We design vertices to generate a photomosaic through a graphics pipeline and suggest a texture representation of an image database whice is used for tile. Both the source image and the tiles are stored to texture, which are matched by a vertex shader and drawn by a fragment shader. This is much faster than several techniques which achieve the best match for each tile.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.36 no.6
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• pp.483-497
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• 2018

Image mosaicking, which combines several images into one image, is effective for analyzing images and important in various fields of spatial information such as a continuous image map. The crucial processes of the image mosaicking are optimal seamline determination and color correction of mosaicked images. In this study, the overlap regions were determined by SURF (Speeded Up Robust Features) for image matching. Based on the characteristics of the edges extracted by Canny filter, seamline candidates were selected from classified edges with their characteristics, and the edges were connected by using Dijkstra algorithm. In particular, anisotropic filter and image pyramid were applied to extract reliable seamlines. In addition, it was possible to determine seamlines effectively and efficiently by utilizing building and road layers from digital maps. Finally, histogram matching and seamline feathering were performed to improve visual quality of the mosaicked images.

• Journal of Korean Society for Geospatial Information Science
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• v.17 no.1
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• pp.105-111
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• 2009

A construction can be more convenient and safer with adequate informations. Consequently, studies on collecting various informations using newest surveying technology and applying these informations to a construction have been making progress recently. Digital images are easy to obtain and contain various informations. Therefore, with the recent development of image processing technology, the application field of digital images is getting wider. In this study, we proposed to use a fisheye lens camera in underground construction sites, especially tunnels, to overcome inconvenience in photographing with general lens cameras. A program for mapping the surface of a tunnel and making a mosaic image is also developed. This mosaic image can be applied to observe and analyze abnormal phenomenons on tunnel surface like cracks, water leakage, exfoliates, and so on.

• Korean Journal of Remote Sensing
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• v.30 no.1
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• pp.1-12
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• 2014

The purpose of this paper is to provide a compact overview of the state-of-art image mosaic algorithms in commercial softwares and to propose objective assessment method of that. Among them, several algorithms, widely used and high quality, result in the mosaic image by applying to seven different kinds of seasons of KOMPSAT-2 images and then consequently each result is analyzed visually. Moreover, quality index is suggested to assess the similarity with colors regarding adjacency images and then it is performed by comparing and analyzing the visual and quantitative results. Consequently, we found out the suggested quality index is feasible.

• Journal of Korean Society for Geospatial Information Science
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• v.12 no.2 s.29
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• pp.61-66
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• 2004

By the advent of the high-resolution Satellite imagery, there are increasing needs in image mosaicking technology which can be applied to various application fields such as GIS(Geographic Information system). To mosaic images, various methods such as image matching and histogram modification are needed. In this study, automated image mosaicking is performed using image matching method based on the multi-resolution wavelet analysis(MWA). Specifically, both area based and feature based matching method are embedded in the multi-resolution wavelet analysis to construct seam line.; seam points are extracted then polygon clipping method are applied to define overlapped area of two adjoining images. Before mosaicking, radiometric correction is proceeded by using histogram matching method. As a result, mosaicking area is automatically extracted by using polygon clipping method. Also, seamless image is acquired using multi-resolution wavelet analysis.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.5
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• pp.339-345
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• 2016

In general, mosaic blocks are used to hide some specified areas, such as human faces and disgusting objects, in an input image when images are uploaded on a web-site or blog. This paper proposes a new algorithm for robustly detecting grid mosaic areas in an image based on the edge projection. The proposed algorithm first extracts the Canny edges from an input image. The algorithm then detects the candidate mosaic blocks based on horizontal and vertical edge projection. Subsequently, the algorithm obtains real mosaic areas from the candidate areas by eliminating the non-mosaic candidate regions through geometric features, such as size and compactness. The experimental results showed that the suggested algorithm detects mosaic areas in images more accurately than other existing methods. The suggested mosaic detection approach is expected to be utilized usefully in a variety of multimedia-related real application areas.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.11a
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• pp.411-415
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• 1999

Image mosaic system is called that switching several image, or moving image into a image. In this paper, we represented that not image mosaic construction with respect to traditional and directional method but representing which mosaic system construction about using tree. Also, in this paper represent study that static image mosaic and dynamic image mosaic.