• Journal of Korea Game Society
• /
• v.13 no.6
• /
• pp.35-42
• /
• 2013

A new compressed image format is proposed to use a large size of image in mobile games without the constraints of hardware specifications such as memory amount, processing power, which encodes each block of a large size image in scan line order. Using the experiments, we show the effectiveness of proposed method compared with a general PNG in terms of compression ratios and required memory in decoding processes. Also, the loading delay can be reduced by decoding only the displaying area of a large image in run-time.

• Journal of Korea Multimedia Society
• /
• v.9 no.10
• /
• pp.1282-1295
• /
• 2006

This paper proposes a method of image tile mosaics to preserve detailed depiction of the source image. This method enhance the shortcoming of the previous mosaic methods that cannot express the detailed depiction because of the gap between tiles. Our method is implemented by the usage of image tiles to preserve detailed depiction of the source image, as well as the usage of 2-layered tiles to.eliminate the gap between tiles. The method suggested in this paper are composed of following process. First of all, the position of the upper layer tile is located through a centroidal voronoi diagram to which an edge avoidance technique is applied, and the position of the lower layer tile is calculated using Delaunay triangulation. Secondly, discover the size and direction field of the tile considering the relation between tiles. Thirdly, adopt a photomosaic technique to use the image tiles. At this time, the technique of multi-level indexing is used to accelerate the speed of image searching. Through above process, the gap between tiles is minimized against other methods and a mosaic image with a maximized detailed description is achieved.

• Journal of the Korea Computer Graphics Society
• /
• v.12 no.2
• /
• pp.9-11
• /
• 2006

본 논문은 원 영상의 세부 묘사를 유지하는 사진 타일 모자이크 방법을 제안한다. 이 방법은 타일 내부의 세부 묘사를 위한 사진 타일의 사용과 타일간의 빈 공간을 제거하기 위한 겹쳐진 타일의 사용을 통해 구현된다. 본 논문에서 제시한 방법은 다음 세 단계로 구성된다. 첫째, 에지 회피 기법이 적용된 CVD를 통해 메인 타일의 위치를 얻고, 딜로니 삼각형화를 이용해 서브 타일의 위치를 계산한다. 둘째, 타일간의 관계를 고려해 타일의 크기와 방향성을 구한다. 셋째, 사진 타일을 사용하기 위해 포토 모자이크 기법을 사용한다. 이때, 다단계 인덱싱기법을 통해 사진 검색의 속도를 높인다. 위의 과정을 통해 타일 간의 빈공간이 최소화되고 타일 내부의 세부 묘사가 극대화된 모자이크 영상을 얻는다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.14 no.4
• /
• pp.841-848
• /
• 2010

A tiled display can present a high resolution image or real-sized 3D objects. It can be used fot effective collaboration by allowing multiple users to allocate their own spaces, which are used privately or shared with others. In this research, a collaborative viewer system, which allows manipulating 3D models, images and movie clips, was constructed on a distributed platform. This allows multiple users to manipulate different contents separately with various input devices. This paper describes an architecture and a prototype system built with the viewer.

• Journal of the Korean Society for Computer Game
• /
• v.31 no.4
• /
• pp.137-144
• /
• 2018

In the past, mosaics were made by laying cloth on the floor and manually tiling the tiles. However, due to recent developments in technology, the data storage method has evolved from analog to digital, so that image representation and conversion can be realized through computer. Also, various expression techniques of mosaic are developed, and it is also used as a method of art representation in digital. There are various studies on the production process of mosaic. The proposed method is a crystallization mosaic that spreads spirally in real time and uses 3D quartz as a tile element. Although existing researches are mostly focused on the purpose of rendering images in more detail, this technique combines untried spiral drawing and crystallization, and attempts to explore new expression techniques in 3D space by attempting a new mosaic method in 3D space. 'Spiral Crystallization Photo', based on this technique, was selected as Top27 in MWU Award 18 and exhibited at Unite Seoul 2018.

• Journal of the Korean Geotechnical Society
• /
• v.40 no.1
• /
• pp.15-28
• /
• 2024

This paper proposes a method to acquire image data inside tunnel structures and a method to structure the acquired image data. By improving the conditions by which image data are acquired inside the tunnel structure, high-quality image data can be obtained from area type tunnel scanning. To improve the data acquisition conditions, a longitudinal rail of the tunnel can be installed on the tunnel ceiling, and image data of the entire tunnel structure can be acquired by moving the installed rail. This study identified 0.5 mm cracked simulation lines under a distance condition of 20 m at resolutions of 3,840 × 2,160 and 720 × 480 pixels. In addition, the proposed image-data-structuring method could acquire image data in image tile units. Here, the image data of the tunnel can be structured by substituting the application factors (resolution of the acquired image and the tunnel size) into a relationship equation. In an experiment, the image data of a tunnel with a length of 1,000 m and a width of 20 m were obtained with a minimum overlap rate of 0.02% to 8.36% depending on resolution and precision, and the size of the local coordinate system was found to be (14 × 15) to (36 × 34) pixels.

• Archives of design research
• /
• v.14 no.4
• /
• pp.117-126
• /
• 2001

A new functional meaning has been given as natural resource to bamboo through reanalysis. Bamboo products contributed to creating added-value of pro-environment. In this study, a potential efficiency and vision of bamboo products and crafts are presented. As bamboo plywood and bamboo decorating paper were developed followed by academic and technological support, an activation of markets has been pursued and bamboo pattern tiles for new furniture was developed. This study examined kinds and characteristics of bamboo and processing of raw material and how to express with the material. Through advanced technology, it identified traditional functions and technological mistakes and analysed domestic and overseas applications to enhance utility of plywood made of bamboo. Bamboo pattern tiles were developed for decorating of furniture doors based on bamboo pattern paper. For patterns, 'tortoise, cranes, and deer'meaning eternity and new millenium among Ten Korean Longevity Animals are simply and lively represented. Series of the sun and mountain use effects of bamboo pieces to present bright images and to maximize quality of bamboo. A pattern of '卍'incorporates mystery of the cosmos and meaning of temples together with traditional patched wrapping cloth, Arirang and Chilgyopannori for beautiful ornamentation. Bamboo decorating tiles are made through accumulation of technologies by a cooperation with industries of bamboo equipment and production of furniture in Damyang Bamboo Products Complex. Processing of raw materials is peformed with equipment of Damyang. Development of samples and production and delivery of bamboo goods are handled in Design Venture of Chosun University Chamber. Developed goods decorating doors of furniture are in sale by an order from furniture industries.

• Journal of KIISE:Computer Systems and Theory
• /
• v.35 no.4
• /
• pp.150-157
• /
• 2008

This paper presents a design and implementation of realtime video player that operates on a tiled-display system consisting of multiple PCs to provide a very large and high resolution display. In the proposed system, the master process transmits a compressed video stream to multiple PCs using UDP multicast. All slaves(PC) receive the same video stream, decompress, clip their designated areas from the decompressed video frame, and display it to their displays while being synchronized with each other. A simple synchronization mechanism based on the H/W clock of each slave is proposed to avoid the skew between the tiles of the display, and a flow-control mechanism based on the bit-rate of the video stream and a pre-buffering scheme are proposed to prevent the jitter The proposed system is implemented with Microsoft DirectX filter technology in order to decouple the video/audio codec from the player.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.28 no.1
• /
• pp.133-142
• /
• 2010

To monitor composition and change of the national land, intelligent topographical classifier which enables accurate classification of land-cover types from airborne LiDAR data is highly required. We developed a topographical classifier development support system cooperating with da1a mining tool WEKA to help users to construct accurate topographical classification systems. The topographical classifier development support system has the following functions; superposing LiDAR data upon corresponding aerial images, dividing LiDAR data into tiles for efficient processing, 3D visualization of partial LiDAR data, feature from tiles, automatic WEKA input generation, and automatic C++ program generation from the classification rule set. In addition, with dam mining tool WEKA, we can choose highly distinguishable features by attribute selection function and choose the best classification model as the result topographical classifier. Therefore, users can easily develop intelligent topographical classifier which is well fitted to the developing objectives by using the topographical classifier development support system.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.26 no.5
• /
• pp.30-42
• /
• 2022

Due to the increase in construction of tunnels, the burdens of maintenance works for tunnel structures have been increasing in Korea. In addition, the increase of traffic volume and aging of materials also threatens the safety of tunnel facilities, therefore, maintenance costs are expected to increase significantly in the future. Accordingly, automated condition assessment technologies like image-based tunnel scanning system for inspection and diagnosis of tunnel facilities have been proposed. For image-based tunnel scanning system, it is key to create a planar image through stitching of multiple images captured by tunnel scanning system. In this study, performance of feature-based stitching algorithms suitable for stitching tunnel scanning images was evaluated. In order to find a suitable algorithm SIFT, ORB, and BRISK are compared. The performance of the proposed algorithm was determined by the number of feature extraction, calculation speed, accuracy of feature matching, and image stitching result. As for stitching performance, SIFT algorithm was the best in all parts of tunnel image. ORB and BRISK also showed satisfactory performance and short calculation time. SIFT can be used to generate precise planar images. ORB and BRISK also showed satisfactory stitching results, confirming the possibility of being used when real-time stitching is required.