• Title, Summary, Keyword: Vector Graphics

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2D Vectorized Storage Technique of 3D Digital Garment Data Using Depth-buffer Test and Pseudo-Bernstein Polynomial Coefficient Correction (깊이 버퍼 테스트와 의사 번스타인 다항식 계수 보정을 이용한 3D 디지털 의복 데이터의 2D 벡터화 저장 기법)

  • Moon, Sun Hee;Kim, Sung Min;Sul, In Hwan
    • Textile Science and Engineering
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    • v.53 no.5
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    • pp.366-371
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    • 2016
  • This paper presents a novel technique to express 3D digital garment data as 2D vectorized graphic file format. The 3D garment mesh data, generated by 3D apparel CAD systems, were projected to 2D image plane, maintaining the triangular mesh and color information. The projected image was saved as scalable vectorized graphics (SVG) file format. Each triangle element comprised of three triangular components to express Gouraud shading. To preserve the in-plane continuous Gouraud shading, pseudo-Bernstein polynomial coefficient was adopted. The proposed method was compared with the results of conventional 2D raster-type images.

Enhanced Image Mapping Method for Computer-Generated Integral Imaging System (집적 영상 시스템을 위한 향상된 이미지 매핑 방법)

  • Lee Bin-Na-Ra;Cho Yong-Joo;Park Kyoung-Shin;Min Sung-Wook
    • The KIPS Transactions:PartB
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    • v.13B no.3
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    • pp.295-300
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    • 2006
  • The integral imaging system is an auto-stereoscopic display that allows users to see 3D images without wearing special glasses. In the integral imaging system, the 3D object information is taken from several view points and stored as elemental images. Then, users can see a 3D reconstructed image by the elemental images displayed through a lens array. The elemental images can be created by computer graphics, which is referred to the computer-generated integral imaging. The process of creating the elemental images is called image mapping. There are some image mapping methods proposed in the past, such as PRR(Point Retracing Rendering), MVR(Multi-Viewpoint Rendering) and PGR(Parallel Group Rendering). However, they have problems with heavy rendering computations or performance barrier as the number of elemental lenses in the lens array increases. Thus, it is difficult to use them in real-time graphics applications, such as virtual reality or real-time, interactive games. In this paper, we propose a new image mapping method named VVR(Viewpoint Vector Rendering) that improves real-time rendering performance. This paper describes the concept of VVR first and the performance comparison of image mapping process with previous methods. Then, it discusses possible directions for the future improvements.

Design of a Truncated Floating-Point Multiplier for Graphic Accelerator of Mobile Devices (모바일 그래픽 가속기용 부동소수점 절사 승산기 설계)

  • Cho, Young-Sung;Lee, Yong-Hwan
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.11 no.3
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    • pp.563-569
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    • 2007
  • As the mobile communication and the semiconductor technology is improved continuously, mobile contents such as the multimedia service and the 2D/3D graphics which require high level graphics are serviced recently. Mobile chips should consume small die area and low power. In this paper, we design a truncated floating-point multiplier that is useful for the 2D/3D vector graphics in mobile devices. The truncated multiplier is based on the radix-4 Booth's encoding algorithm and a truncation algorithm is used to achieve small area and low power. The average percent error of the multiplier is as small as 0.00003% and neglectable for mobile applications. The synthesis result using 0.35um CMOS cell library shows that the number of gates for the truncated multiplier is only 33.8 percent of the conventional radix-4 Booth's multiplier.

Collision Avoidances of an Autonomous Mobile Robot Hilt Unknown Obstacles (알려지지 않은 장애물 존재시 자율주행 운반체의 장애물 회피)

  • Won, Ji-Uk;Lee, Kee-Seong
    • Proceedings of the KIEE Conference
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    • pp.345-348
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    • 1994
  • A real-time collision avoidance algorithm for an AMR (Autonomous Mobile Robot) using the Distance Transform and Vector Field Histogram is studied. This approach enables AMR to find a collision-free path with the unknown obstacles. All system parameters including positions of the obstacles can be accepted using a mouse icon and all the obtained trajectories can be displayed on a computer monitor in graphics.

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Acceleration of 2D Image Based Flow Visualization using GPU (GPU를 이용한 2차원 영상 기반 유동 가시화 기법의 가속)

  • Lee, Joong-Youn
    • Proceedings of the Korea Contents Association Conference
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    • pp.543-546
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    • 2007
  • Flow visualization is one of visualization techniques and it means a visual expression of vector data using 2D or 3D graphics. It aims for human to easily find and understand a special feature of the vector data. The Image Based Flow Visualization (IBFV) is one of the fastest technique in the dense integration based flow visualization techniques. In this paper, IBFV is accelerated and implemented using commodity GPU. Especially, mesh advection is accelerated at the vertex program.

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A Hybrid Visibility Determination Method to Get Vector Silhouette

  • Lu, Xuemei;Lee, Ki-Jung;WhangBo, Taeg-Keun
    • Journal of Korea Multimedia Society
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    • v.11 no.6
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    • pp.755-763
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    • 2008
  • Silhouette is useful in computer graphics for a number of techniques such as non-photorealistic rendering, silhouette clipping, and blueprint generating. Methods for generating silhouette are classified into three categories: image-based, object-based, and hybrid-based. Hybrid-based method is effective in terms of time complexity but spatial coherence problem still remains. In this paper, we proposed a new hybrid-based method which produces 3D data for silhouette and also guarantees no spatial coherence problem. To verify the efficiency of the proposed algorithm, several experiments are conducted for various 3D models from simple to quite complex. Results show that our algorithm generates no gap between any two consecutive silhouette lines when the silhouette model is magnified significantly.

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Developing Expert System for Recovering the Original Form of Ancient Relics Based on Computer Graphics and Image Processing (컴퓨터 그래픽스 및 영상처리를 이용한 문화 원형 복원 전문가시스템 개발)

  • Moon, Ho-Seok;Sohn, Myung-Ho
    • Journal of the Korea Society of Computer and Information
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    • v.11 no.6
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    • pp.269-277
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    • 2006
  • We propose a new expert system for recovering the broken fragments of relics into an original form using computer graphics and image processing. This paper presents a system with an application to tombstones objects of flat plane with letters carved in for assembling the fragments by placing their respective fragments in the right position. The matching process contains three sub-processes: aligning the front and letters of an object, identifying the matching directions, and determining the detailed matching positions. We apply least squares fitting, vector inner product, and geometric and RGB errors to the matching process. It turned out that 2-D translations via fragments-alignment enable us to save the computational load significantly. Based on experimental results from the damaged cultural fragments, the performance of the proposed method is illustrated.

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Design and Implementation of Thin Client SVG Map Service System for LBS (LBS를 위한 서버기반 SVG Map 서비스 시스템 설계 및 구현)

  • Chung Yeong-Jee;Kim Myung-Sam
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.7
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    • pp.1588-1596
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    • 2004
  • Recently, many WMS(Web Mapping Services) and POI(Point of Interest) service on to be in service on the Internet using Web CIS(Geographic Information System) as information Technology and computer HW are evolved faster in its speed, network bandwidth and features. The Web GIS is, however, limited and constrained on the specification of its system configuration, the service class provided and the presentation methodology of a map. As the mobile Internet becomes popular in mobile service, Web GIS service on mobile environment is strongly required and to be provided by LBS(Location Based Service) on a mobile client such as PDA with location information of the user. In this paper, we made an effort to design and implement a GIS computing environment by thin client for mobile web mapping service. For implementing the thin client GIS computing environment, we were using NGII's(National Geographic Information Institute's) DXF map, representing the map by SVG(Scalable Vector Graphics) recommended by OGC(OpenGis Consortium), and adapting standard XML web service to provide the thin client GIS service on PDA by applying the location information of the user in realtime with GPS on mobile environment.

Tree-inspired Chair Modeling (나무 성장 시뮬레이션을 이용한 의자 모델링 기법)

  • Zhang, Qimeng;Byun, Hae Won
    • Journal of The Korea Computer Graphics Society
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    • v.23 no.5
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    • pp.29-38
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    • 2017
  • We propose a method for tree-inspired chair modeling that can generate a tree-branch pattern in the skeleton of an arbitrary chair shape. Unlike existing methods that merge multiple-input models, the proposed method requires only one mesh as input, namely the contour mesh of the user's desired part, to model the chair with a branch pattern generated by tree-growth simulation. We propose a new method for the efficient extraction of the contour-mesh region in the tree-branch pattern. First, we extract the contour mesh based on the face area of the input mesh. We then use the front and back mesh information to generate a skeleton mesh that reconstructs the connection information. In addition, to obtain the tree-branch pattern matching the shape of the input model, we propose a three-way tree-growth simulation method that considers the tangent vector of the shape surface. The proposed method reveals a new type of furniture modeling by using an existing furniture model and simple parameter values to model tree branches shaped appropriately for the input model skeleton. Our experiments demonstrate the performance and effectiveness of the proposed method.

Design and Implementation of Mobile Web Map Service (모바일을 위한 웹지도 서비스의 설계 및 구현)

  • Choi, Jae-Young;Chung, Yeong-Jee
    • Journal of Internet Computing and Services
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    • v.6 no.5
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    • pp.97-110
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    • 2005
  • Recently, many WMS(Web Map Services) and POI(Point of Interest) services come to be in service on the Internet using Web GIS(Geographic Information System) as Information Technology and computer H/W are evolved faster in its speed, network bandwidth and features. The Web GIS is, however, limited and constrained on the specification of its system configuration, the service class provided and the presentation methodology of a map. As the mobile Internet becomes popular in mobile service, Web GIS service on mobile environment is strongly required and to be provided by location based WMS(Web Map Service) on a mobile client such as PDA with location information of the user. In this paper, we made an effort to design and implement a GIS computing environment by thin client for mobile web map service. For implementing the thin client GIS computing environment. we were using NGII's(National Geographic Information Institute's) DXF map, representing the map by SVG(Scalable Vector Graphics) recommended by OGC(OpenGis Consortium), and adapting standard XML web service to provide the thin client GIS service on PDA by applying the location information of the user in realtime with GPS on mobile environment.

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