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Opacity-weighted color interpolation, for volume sampling

Craig M. Wittenbrink, Thomas Malzbender, Michael E. Goss
1998 Proceedings of the 1998 IEEE symposium on Volume visualization - VVS '98  
We show analytically that opacity-weighted color interpolation exactly reproduces material based interpolation results for certain volume classifiers, with the efficiencies of preclassification.  ...  We present an improved technique, opacity-weighted color interpolation, evaluate the RMS error improvement, hardware and algorithm efficiency, and demonstrated improvements.  ...  [DCH88] specify opacity weighting of the colors for volume rendering by preweighting.  ... 
doi:10.1145/288126.288186 dblp:conf/vvs/WittenbrinkMG98 fatcat:anfrs7s3gff6bfbf34i4ki2qha

Opacity-weighted color interpolation for volume sampling

C.M. Wittenbrink, T. Malzbender, M.E. Goss
IEEE Symposium on Volume Visualization (Cat. No.989EX300)  
We show analytically that opacity-weighted color interpolation exactly reproduces material based interpolation results for certain volume classifiers, with the efficiencies of preclassification.  ...  We present an improved technique, opacity-weighted color interpolation, evaluate the RMS error improvement, hardware and algorithm efficiency, and demonstrated improvements.  ...  [DCH88] specify opacity weighting of the colors for volume rendering by preweighting.  ... 
doi:10.1109/svv.1998.729595 fatcat:rvvuoypamnh5ziccycue5vdu5y

Research on Improved Ray Casting Algorithm and Its Application in Three-Dimensional Reconstruction

ZheShu Jia, DeYun Chen, Bo Wang, Chaoqun Duan
2021 Shock and Vibration  
This method first classifies CT data, assigns corresponding color values and opacity transfer functions to different types of data, and then uses inverse distance-weighted interpolation (IDWI) sampling  ...  to replace the trilinear interpolation sampling method for the voxel where the sampling point is located to accelerate the interpolation operation.  ...  Compositely calculating the value of and C for each pixel Output: Opacity per pixel α, color value C Figure 1 : Inverse distance-weighted interpolation.  ... 
doi:10.1155/2021/8718523 fatcat:ogtokxsb2beqfhlyqwxoaisjf4

High-Quality Lighting and Efficient Pre-Integration for Volume Rendering [article]

Eric B. Lum, Brett Wilson, Kwan-Liu Ma
2004 EUROVIS 2005: Eurographics / IEEE VGTC Symposium on Visualization  
The lighting for pre-integrated rendering is therefore subject to the same sampling artifacts as in standard volume rendering.  ...  Pre-integrated volume rendering is an effective technique for generating high-quality visualizations.  ...  Pre-Integrated Volume Rendering Volume rendering consists of integrating color and opacity values across a 3D space.  ... 
doi:10.2312/vissym/vissym04/025-034 fatcat:rb3yf23c2bcppfu44exdtlgzeq

Volume Rendering of 3D Borehole Data Based on GPU

Wei Jiang Wu, Li Zhi Qin, Shu Ma, Guo He Li
2013 Advanced Materials Research  
Taking 3D borehole data for research object, an algorithm flow of volume rendering based GPU is given.  ...  According to the limited and discrete characteristics of 3D borehole data, Kriging interpolation algorithm is used to construct a regular grid data model.  ...  i-1 .After pass through the ith volume element, the color value is destColor i ,the opacity value is (2)Calculate sampling step rayDir according to volume data. (3)Sample volume texture and accumulate  ... 
doi:10.4028/www.scientific.net/amr.765-767.585 fatcat:xqoaz4uyyregzpnkihjtdwju6a

A Perceptual Framework for Comparisons of Direct Volume Rendered Images [chapter]

Hon-Cheng Wong, Huamin Qu, Un-Hong Wong, Zesheng Tang, Klaus Mueller
2006 Lecture Notes in Computer Science  
algorithm with different specifications such as shading method, gradient estimation scheme, and sampling rate.  ...  In this paper we propose a perceptual framework, which is based on the Visible Differences Predictor (VDP), for comparing the direct volume rendered images generated with different algorithms or the same  ...  color interpolated and separate color interpolated DVRs (256 3 engine): (a) Opacity-weighted color interpolated DVR; (b) Separate color interpolated DVR; (c) VDP result (Red pixels: 64.00%) Fig. 7 .  ... 
doi:10.1007/11949534_133 fatcat:7npbueeounaetnw7yyy33ymyce

Shear-Warp Deluxe: The Shear-Warp Algorithm Revisited [article]

Jon Sweeney, Klaus Mueller
2002 EUROVIS 2005: Eurographics / IEEE VGTC Symposium on Visualization  
Specifically, we investigate the effects of: (i) post-interpolated classification and shading, (ii) matched volume sampling on zoom, (iii) the interpolation of intermediate slices to reduce inter-slice  ...  Despite continued advances in volume rendering technology, the Shear-Warp algorithm, although conceived as early as 1994, still remains the world's fastest purely software-based volume rendering algorithm  ...  We would like to thank Tom Theussl and Torsten Möller for helpful discussions on BCC grids, and the paper reviewers for their insightful comments.  ... 
doi:10.2312/vissym/vissym02/095-104 fatcat:lqjsnq2cirfifb6ihneat2pgs4

Extended specifications and test data sets for data level comparisons of direct volume rendering algorithms

Kwansik Kim, C.M. Wittenbrink, A. Pang
2001 IEEE Transactions on Visualization and Computer Graphics  
Therefore, comparative studies are essential for objective interpretation.  ...  Direct volume rendering (DVR) algorithms do not generate intermediate geometry to create a visualization. Yet, they produce countless variations in the resulting images.  ...  We identify three variations in this paper, and refer to them as data interpolation (DATA), color interpolation (COLOR) and color interpolation with opacity weighting (COLOR-OW).  ... 
doi:10.1109/2945.965345 fatcat:wj5brc43sbg7pneqxplnkzy62e

Plenoxels: Radiance Fields without Neural Networks [article]

Alex Yu, Sara Fridovich-Keil, Matthew Tancik, Qinhong Chen, Benjamin Recht, Angjoo Kanazawa
2021 arXiv   pre-print
We introduce Plenoxels (plenoptic voxels), a system for photorealistic view synthesis. Plenoxels represent a scene as a sparse 3D grid with spherical harmonics.  ...  Additionally, we would like to thank Ren Ng for helpful suggestions and Hang Gao for reviewing a draft of the paper.  ...  Interpolation The opacity and color at each sample point along each ray are computed by trilinear interpolation of opacity and harmonic coefficients stored at the nearest 8 voxels.  ... 
arXiv:2112.05131v1 fatcat:p6mhlt3r3va4ndtm4t7j3hjlb4

Strategies for direct volume rendering of diffusion tensor fields

G. Kindlmann, D. Weinstein, D. Hart
2000 IEEE Transactions on Visualization and Computer Graphics  
Previous work introduced three such methods: barycentric opacity maps, hue-balls (for color), and lit-tensors (for shading).  ...  In order to use volume rendering, however, we must develop methods for assigning opacity and color to the data, and create a method to shade the data to improve the legibility of the rendering.  ...  Alexander, assistant research professor in the Department of Radiology, University of Utah School of Medicine, for involving them in his research on diffusion tensor imaging, providing them with high-resolution  ... 
doi:10.1109/2945.856994 fatcat:2g34dmwbkje2baonqxxwjpjgty

Antara: An Interactive 3D Volume Rendering and Visualization Framework [article]

Pratik Kalshetti, Parag Rahangdale, Dinesh Jangra, Manas Bundele, Chiranjoy Chattopadhyay
2018 arXiv   pre-print
In ray casting, a ray of light is made to pass through the volume data. The interaction of each voxel with this ray is used to assign RGB and alpha values for every voxel in the volume.  ...  For 3D Medical Data, Magnetic Resonance Images (MRI) has been used. To create the 3D model, we used the Direct Volume Rendering technique.  ...  The color tuple and opacity values are added to the pixel using a weighting formula and a step is taken along the ray to the next re-sample point.  ... 
arXiv:1812.04233v1 fatcat:glif6ubjgzfl7c5gfodpamx2hq

Three Architectures for Volume Rendering

Jurgen Hesser, Reinhard Manner, Gunter Knittel, Wolfgang Strasser, Hanspeter Pfister, Arie Kaufman
1995 Computer graphics forum (Print)  
The hardware of VIRIM consists of several modules, each composed of a geometry unit for volume rotation, resampling, and gradient computation and a ray-casting unit for the final image generation.  ...  The high computational demands of real-time volume rendering and continued technological advances in the area of VLSI give impetus to the development of special-purpose volume rendering architectures.  ...  This results in two new datasets, one that holds the color of the shaded samples, and a classified volume that holds sample opacities.  ... 
doi:10.1111/1467-8659.1430111 fatcat:46w4qr3lbngpxp7pxkn32fxg5i

Three Architectures for Volume Rendering

Jürgen Hesser, Reinhard Manner, Günter Knittel, Wolfgang Straßer, Hanspeter Pfister, Arie Kaufman
1995 Computer graphics forum (Print)  
The hardware of VIRIM consists of several modules, each composed of a geometry unit for volume rotation, resampling, and gradient computation and a ray-casting unit for the final image generation.  ...  The high computational demands of real-time volume rendering and continued technological advances in the area of VLSI give impetus to the development of special-purpose volume rendering architectures.  ...  This results in two new datasets, one that holds the color of the shaded samples, and a classified volume that holds sample opacities.  ... 
doi:10.1111/j.1467-8659.1995.cgf143_0111.x fatcat:g6ju5yk2xvdzhcr4zwv2p7cuhe

A Practical Evaluation of Popular Volume Rendering Algorithms

Jian Huang, Klaus Mueller, Roger Crawfis, Dirk Bartz, Michael Meissner
2000 2000 IEEE Symposium on Volume Visualization (VV 2000)  
This paper evaluates and compares four volume rendering algorithms that have become rather popular for rendering datasets described on uniform rectilinear grids: raycasting, splatting, shear-warp, and  ...  Our analysis also indicates the current weaknesses in each algorithm's pipeline, and possible solutions to these as well as pointers for future research are offered.  ...  ACKNOWLEDGEMENTS We would like to thank Jürgen Schulze-Döbold for helpful discussion.  ... 
doi:10.1109/vv.2000.10009 fatcat:kxfdnon5fjdftju3tvmv2cetzq

A practical evaluation of popular volume rendering algorithms

Michael Meißner, Jian Huang, Dirk Bartz, Klaus Mueller, Roger Crawfis
2000 Proceedings of the 2000 IEEE symposium on Volume visualization - VVS '00  
This paper evaluates and compares four volume rendering algorithms that have become rather popular for rendering datasets described on uniform rectilinear grids: raycasting, splatting, shear-warp, and  ...  Our analysis also indicates the current weaknesses in each algorithm's pipeline, and possible solutions to these as well as pointers for future research are offered.  ...  ACKNOWLEDGEMENTS We would like to thank Jürgen Schulze-Döbold for helpful discussion.  ... 
doi:10.1145/353888.353903 dblp:conf/vvs/MeissnerHBMC00 fatcat:tddvccxudrf3zgwqbtgnczgo5q
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