• Title, Summary, Keyword: Volumetric Rendering

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Implementation of AR Remote Rendering Techniques for Real-time Volumetric 3D Video

  • Lee, Daehyeon;Lee, Munyong;Lee, Sang-ha;Lee, Jaehyun;Kwon, Soonchul
    • International Journal of Internet, Broadcasting and Communication
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    • v.12 no.2
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    • pp.90-97
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    • 2020
  • Recently, with the growth of mixed reality industrial infrastructure, relevant convergence research has been proposed. For real-time mixed reality services such as remote video conferencing, the research on real-time acquisition-process-transfer methods is required. This paper aims to implement an AR remote rendering method of volumetric 3D video data. We have proposed and implemented two modules; one, the parsing module of the volumetric 3D video to a game engine, and two, the server rendering module. The result of the experiment showed that the volumetric 3D video sequence data of about 15 MB was compressed by 6-7%. The remote module was streamed at 27 fps at a 1200 by 1200 resolution. The results of this paper are expected to be applied to an AR cloud service.

An Efficient Virtual Teeth Modeling for Dental Training System

  • Kim, Lae-Hyun;Park, Se-Hyung
    • International Journal of CAD/CAM
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    • v.8 no.1
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    • pp.41-44
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    • 2009
  • This paper describes an implementation of virtual teeth modeling for a haptic dental simulation. The system allows dental students to practice dental procedures with realistic tactual feelings. The system requires fast and stable haptic rendering and volume modeling techniques working on the virtual tooth. In our implementation, a volumetric implicit surface is used for intuitive shape modification without topological constraints and haptic rendering. The volumetric implicit surface is generated from input geometric model by using a closest point transformation algorithm. And for visual rendering, we apply an adaptive polygonization method to convert volumetric teeth model to geometric model. We improve our previous system using new octree design to save memory requirement while increase the performance and visual quality.

Occlusion-based Direct Volume Rendering for Computed Tomography Image

  • Jung, Younhyun
    • Journal of Multimedia Information System
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    • v.5 no.1
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    • pp.35-42
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    • 2018
  • Direct volume rendering (DVR) is an important 3D visualization method for medical images as it depicts the full volumetric data. However, because DVR renders the whole volume, regions of interests (ROIs) such as a tumor that are embedded within the volume maybe occluded from view. Thus, conventional 2D cross-sectional views are still widely used, while the advantages of the DVR are often neglected. In this study, we propose a new visualization algorithm where we augment the 2D slice of interest (SOI) from an image volume with volumetric information derived from the DVR of the same volume. Our occlusion-based DVR augmentation for SOI (ODAS) uses the occlusion information derived from the voxels in front of the SOI to calculate a depth parameter that controls the amount of DVR visibility which is used to provide 3D spatial cues while not impairing the visibility of the SOI. We outline the capabilities of our ODAS and through a variety of computer tomography (CT) medical image examples, compare it to a conventional fusion of the SOI and the clipped DVR.

볼륨렌더링을 이용한 3차원 물체의 형상화

  • 최환수
    • 전기의세계
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    • v.41 no.9
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    • pp.48-52
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    • 1992
  • 본 글에서 구미에서 활발히 실용화 되고 있는 volumetric rendering 기술을 간략히 소개하고자 한다. 특히 이기술은 volumetric dataset을 쉽게 구할 수 있는 진단방사선과에게 활발히 실용화를 연구하고 있으며 최근에는 몇 대규모 병원에서 surgical planning을 위한 임상에도 사용하기 시작하였으며 향후 암환자의 방사선치료, 신경외과의 stereotaxic surgery등으로 그 활용 범위를 넓히기위해 많은 연구를 할 수 있는 모든 분야에 적용이 가능하다. 특히 등고선 data를 이용한 지형의 형상화는 군사적 용도로 긴요하게 쓰일 수 있다.

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A Design and Implementation of Volume Rendering Program based on 3D Sampling (3차원 샘플링에 기만을 둔 볼륨랜더링 프로그램의 설계 및 구현)

  • 박재영;이병일;최흥국
    • Journal of Korea Multimedia Society
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    • v.5 no.5
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    • pp.494-504
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    • 2002
  • Volume rendering is a method of displaying volumetric data as a sequence two-dimensional image. Because this algorithm has an advantage of visualizing structures within objects, it has recently been used to analyze medical images i.e, MRI, PET, and SPECT. In this paper. we suggested a method for creating images easily from sampled volumetric data and applied the interpolation method to medical images. Additionally, we implemented and applied two kinds of interpolation methods to improve the image quality, linear interpolation and cubic interpolation at the sampling stage. Subsequently, we compared the results of volume rendered data using a transfer function. We anticipate a significant contribution to diagnosis through image reconstruction using a volumetric data set, because volume rendering techniques of medical images are the result of 3-dimensional data.

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Volume Haptic Rendering Algorithm for Realistic Modeling (실감형 모델링을 위한 볼륨 햅틱 렌더링 알고리즘)

  • Jung, Ji-Chan;Park, Joon-Young
    • Korean Journal of Computational Design and Engineering
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    • v.15 no.2
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    • pp.136-143
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    • 2010
  • Realistic Modeling is to maximize the reality of the environment in which perception is made by virtual environment or remote control using two or more senses of human. Especially, the field of haptic rendering, which provides reality through interaction of visual and tactual sense in realistic model, has brought attention. Haptic rendering calculates the force caused by model deformation during interaction with a virtual model and returns it to the user. Deformable model in the haptic rendering has more complexity than a rigid body because the deformation is calculated inside as well as the outside the model. For this model, Gibson suggested the 3D ChainMail algorithm using volumetric data. However, in case of the deformable model with non-homogeneous materials, there were some discordances between visual and tactual sense information when calculating the force-feedback in real time. Therefore, we propose an algorithm for the Volume Haptic Rendering of non-homogeneous deformable object that reflects the force-feedback consistently in real time, depending on visual information (the amount of deformation), without any post-processing.

Volumetric NURBS Representation of Multidimensional and Heterogeneous Objects: Concepts and Formation (VNURBS기반의 다차원 불균질 볼륨 객체의 표현: 개념 및 형성)

  • Park S. K.
    • Korean Journal of Computational Design and Engineering
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    • v.10 no.5
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    • pp.303-313
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    • 2005
  • This paper proposes a generalized NURBS model, called Volumetric NURBS or VNURBS for representing volumetric objects with multiple attributes embedded in multidimensional space. This model provides a mathematical framework for modeling complex structure of heterogeneous objects and analyzing inside of objects to discover features that are directly inaccessible, for deeper understanding of complex field configurations. The defining procedure of VNURBS, which explains two directional extensions of NURBS, shows VNURBS is a generalized volume function not depending on the domain and its range dimensionality. And the recursive a1gorithm for VNURBS derivatives is described as a computational basis for efficient and robust volume modeling. In addition, the specialized versions of VNURBS demonstrate that VNURBS is applicable to various applications such as geometric modeling, volume rendering, and physical field modeling.

Improvement Depth Perception of Volume Rendering using Virtual Reality (가상현실을 통한 볼륨렌더링 깊이 인식 향상)

  • Choi, JunYoung;Jeong, HaeJin;Jeong, Won-Ki
    • Journal of the Korea Computer Graphics Society
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    • v.24 no.2
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    • pp.29-40
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    • 2018
  • Direct volume rendering (DVR) is a commonly used method to visualize inner structures in 3D volumetric datasets. However, conventional volume rendering on a 2D display lacks depth perception due to dimensionality reduction caused by ray casting. In this work, we investigate how emerging Virtual Reality (VR) can improve the usability of direct volume rendering. We developed real-time high-resolution DVR system in virtual reality, and measures the usefulness of volume rendering with improved depth perception via a user study conducted by 38 participants. The result indicates that virtual reality significantly improves the usability of DVR by allowing better depth perception.

Peach & Pit Volume Measurement and 3D Visualization using Magnetic Resonance Imaging Data (자기공명영상을 이용한 복숭아 및 씨의 부피 측정과 3차원 가시화)

  • 김철수
    • Journal of Biosystems Engineering
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    • v.27 no.3
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    • pp.227-234
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    • 2002
  • This study was conducted to nondestructively estimate the volumetric information of peach and pit and to visualize the 3D information of internal structure from magnetic resonance imaging(MRI) data. Bruker Biospec 7T spectrometer operating at a proton reosonant frequency of 300 MHz was used for acquisition of MRI data of peach. Image processing algorithms and visualization techniques were implemented by using MATLAB (Mathworks) and Visualization Toolkit(Kitware), respectively. Thresholding algorithm and Kohonen's self organizing map(SOM) were applied to MRI data fur region segmentation. Volumetric information were estimated from segemented images and compared to the actual measurements. The average prediction errors of peach and pit volumes were 4.5%, 26.1%, respectively for the thresholding algorithm. and were 2.1%, 19.9%. respectively for the SOM. Although we couldn't get the statistically meaningful results with the limited number of samples, the average prediction errors were lower when the region segmentation was done by SOM rather than thresholding. The 3D visualization techniques such as isosurface construction and volume rendering were successfully implemented, by which we could nondestructively obtain the useful information of internal structures of peach.

Point Cloud Data Driven Level of detail Generation in Low Level GPU Devices (Low Level GPU에서 Point Cloud를 이용한 Level of detail 생성에 대한 연구)

  • Kam, JungWon;Gu, BonWoo;Jin, KyoHong
    • Journal of the Korea Institute of Military Science and Technology
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    • v.23 no.6
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    • pp.542-553
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    • 2020
  • Virtual world and simulation need large scale map rendering. However, rendering too many vertices is a computationally complex and time-consuming process. Some game development companies have developed 3D LOD objects for high-speed rendering based on distance between camera and 3D object. Terrain physics simulation researchers need a way to recognize the original object shape from 3D LOD objects. In this paper, we proposed simply automatic LOD framework using point cloud data (PCD). This PCD was created using a 6-direct orthographic ray. Various experiments are performed to validate the effectiveness of the proposed method. We hope the proposed automatic LOD generation framework can play an important role in game development and terrain physic simulation.