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Parallel-split shadow maps for large-scale virtual environments

Fan Zhang, Hanqiu Sun, Leilei Xu, Lee Kit Lun
2006 Proceedings of the 2006 ACM international conference on Virtual reality continuum and its applications - VRCIA '06  
A fast and robust split strategy based on the analysis of shadow map aliasing has been proposed, which produces a moderate aliasing distribution over the whole depth range.  ...  However, shadow mapping usually suffers from the inherent aliasing errors due to the image-based nature.  ...  and trapezoid shadow maps (TSMs) from NVidia SDK 9.1.  ... 
doi:10.1145/1128923.1128975 dblp:conf/vrcai/ZhangSXL06 fatcat:ty5skxpp5za6nciujggelspg7a

View interpolation for image synthesis

Shenchang Eric Chen, Lance Williams
1993 Proceedings of the 20th annual conference on Computer graphics and interactive techniques - SIGGRAPH '93  
The method also can be used to greatly accelerate the computation of motion blur and soft shadows cast by area light sources.  ...  The special-effects technique of morphing, which combines interpolation of texture maps and their shape, is applied to computing arbitrary intermediate frames from an array of prestored images.  ...  The temporal samples were anti-aliased with a box filter. Each image took around 5 seconds to render on a high-end workstation with 3D graphics hardware support.  ... 
doi:10.1145/166117.166153 dblp:conf/siggraph/ChenW93 fatcat:q52vfot2w5gyha2hlw7q4hkrcm

A montage method: the overlaying of the computer generated images onto a background photograph

Eihachiro Nakamae, Koichi Harada, Takao Ishizaki, Tomoyuki Nishita
1986 Proceedings of the 13th annual conference on Computer graphics and interactive techniques - SIGGRAPH '86  
(g) correponds to (d) in the previous example (anti-aliasing, the distance from the viewpoint and the shadows are all considered).  ...  Fig. 5 (continued)  ... 
doi:10.1145/15922.15909 dblp:conf/siggraph/NakamaeHIN86 fatcat:h5nvgu4e7fhulbvrk6p5lsteyy

A montage method: the overlaying of the computer generated images onto a background photograph

Eihachiro Nakamae, Koichi Harada, Takao Ishizaki, Tomoyuki Nishita
1986 Computer graphics  
(g) correponds to (d) in the previous example (anti-aliasing, the distance from the viewpoint and the shadows are all considered).  ...  Fig. 5 (continued)  ... 
doi:10.1145/15886.15909 fatcat:x3xdaoj24fcdnnqhkpnw24wgde

Filtering approaches for real-time anti-aliasing

Jorge Jimenez, Timothy Lottes, Hugh Malan, Emil Persson, Dmitry Andreev, Tiago Sousa, Diego Gutierrez, Jason Yang, Alexander Reshetov, Pete Demoreuille, Tobias Berghoff, Cedric Perthuis (+2 others)
2011 ACM SIGGRAPH 2011 Courses on - SIGGRAPH '11  
The Saboteur, without anti-aliasing and with SPUAA respectively.  ...  Figure 5 : 5 Images obtained with Jimenez's MLAA. Insets show close-ups with no anti-aliasing at all (left) and processed with our technique (right).  ... 
doi:10.1145/2037636.2037642 fatcat:u2ur75c3obbslijj43tlwfhv4a

Towards a Taxonomy for Display Processors [chapter]

Bengt-Olaf Schneider
1991 Advances in Computer Graphics Hardware IV  
The model identifies scan conversion, hidden surface removal, shading and anti-aliasing as tile key functions of the display processor.  ...  This architecture partitions the image generation process ill image space and employs a. tree topology.  ...  A further distinction between different anti-aliasing techniques is whether the anti aliasing is adaptive or not. Anti-aliasing is necessary only at the contours (edges) of objects.  ... 
doi:10.1007/978-3-642-76298-7_1 fatcat:gsssltnktnd6jmxc24pikkllcq

A Survey of Nonlinear Prefiltering Methods for Efficient and Accurate Surface Shading

E. Bruneton, F. Neyret
2012 IEEE Transactions on Visualization and Computer Graphics  
ACKNOWLEDGMENT We thank Charles De Rousiers for suggestions and proofreading.  ...  + (d − µ A ) 2 if d > µ A , else 1 This gives anti-aliased hard shadows with only two values per shadow map texel.  ...  These warped depths can thus be linearly pre-filtered, unlike the depth map Z s itself: U A (d) ≈ exp(−cd) Aŵ (s) exp(cZ s )ds (38) This gives anti-aliased hard shadows with only one parameter per shadow  ... 
doi:10.1109/tvcg.2011.81 pmid:21519101 fatcat:xd3wlbgslraupebejqesmuinai

Edge Preserving Interpolation of Digital Images Using Fuzzy Inference

Hou-Chun Ting, Hsueh-Ming Hang
1997 Journal of Visual Communication and Image Representation  
Therefore, non-linear and/ given (known) pixels, and then, the pixels in-between can or spatially variant interpolators designed based on this be synthesized from the continuous functions [5] . concept  ...  Howlow frequency components and bring in high frequency ever, due to the small footage of the fuzzy interpolation method, it cannot avoid edge jaggedness along the highly oblique edges component aliasing  ...  The line segment size is empirically ages with intensity discontinuity and (ii) natural images chosen to be 5 pixels (i.e., M ϭ 2) in our experiments. The with/without anti-aliasing filtering.  ... 
doi:10.1006/jvci.1997.0364 fatcat:e54yduxyjrghxpydmpyf3y36tm

Interactive Dynamic Volume Illumination with Refraction and Caustics

Jens G. Magnus, Stefan Bruckner
2018 IEEE Transactions on Visualization and Computer Graphics  
giving insight in the physics behind our light model. 2 Abstract Figure 0.1: The visible human CT dataset rendered using the proposed technique -the skeleton is embedded in a colored transmissive medium with  ...  It is fully dynamic and all parameters such as light position and transfer function can be modified interactively without a performance penalty.  ...  Figure 4 . 5 : 45 Distorted environment map behind a refractive medium with mipmapping anti-aliasing (left) and summed area table anti-aliasing (right).  ... 
doi:10.1109/tvcg.2017.2744438 pmid:28866548 fatcat:yw3ng5a3wrgktmzf4cbo2i6tjm

Rapid 3-D cone-beam reconstruction with the simultaneous algebraic reconstruction technique (SART) using 2-D texture mapping hardware

K. Mueller, R. Yagel
2000 IEEE Transactions on Medical Imaging  
In this paper, we address this shortcoming and investigate the utility of widely available 2-D texture mapping graphics hardware for the purpose of accelerating the 3-D algebraic reconstruction.  ...  We find that this hardware allows 3-D cone-beam reconstructions to be obtained at almost interactive speeds, with speed-ups of over 50 with respect to implementations that only use general-purpose CPUs  ...  These extended framebuffers, called accumulation buffers [9] , can also be used to generate soft shadows, depth-of-field effects, as well as high-quality anti-aliasing of polygonal objects [9] .  ... 
doi:10.1109/42.897815 pmid:11212371 fatcat:y56vhd4qqnem5kvurqg7ukrimu

Emancipated pixels

John Underkoffler, Brygg Ullmer, Hiroshi Ishii
1999 Proceedings of the 26th annual conference on Computer graphics and interactive techniques - SIGGRAPH '99  
We discuss the requirements of such real-world graphics, including computational & networking demands; schemes for spatially omnipresent capture and display; and issues of design and interaction that emerge  ...  These discussions are both illustrated and motivated by five particular applications that have been built for a real, experimental Luminous Room space, and by details of the current technical approach  ...  ; Gustavo Santos and Dan Chak, whose future we expect to transcend our mere present; and -most of all -Wendy Plesniak, who in 1996 catalyzed the entire project idea with a short sentence and whose influence  ... 
doi:10.1145/311535.311593 dblp:conf/siggraph/UnderkofflerUI99 fatcat:hzpjnmmzgvcodarlomossvjbri

A Novel Transmitter Architecture for Spectrally-Precoded OFDM

Medhat Mohamad, Rickard Nilsson, Jaap Van De Beek
2018 IEEE Transactions on Circuits and Systems Part 1: Regular Papers  
We also study the compliance of the spectrally precoded OFDM transmitter with the 3GPP standardization measures and analyze its computation complexity.  ...  At the receiver side, we analyze the in-band interference and BER performance of the suggested precoding approach.  ...  The reconstruction stage of the DAC is typically too weak to completely filter out the aliases as Figure 4 shows. Therefore, an anti aliasing filter usually follows the DAC [18] .  ... 
doi:10.1109/tcsi.2018.2797527 fatcat:ih6pgzm5tbgepkhk2qusrehl4y

Modelling the physics in the iterative reconstruction for transmission computed tomography

Johan Nuyts, Bruno De Man, Jeffrey A Fessler, Wojciech Zbijewski, Freek J Beekman
2013 Physics in Medicine and Biology  
In addition, new hardware will provide new opportunities and challenges to improve CT with new modelling.  ...  The widespread implementation of IR with a highly accurate model-based correction, however, still requires significant effort.  ...  Acknowledgments BDM and JF are supported in part by the NIH grant R01-HL-098686. FB is supported by the 3Binding PID Project, Dutch Economical Affairs.  ... 
doi:10.1088/0031-9155/58/12/r63 pmid:23739261 pmcid:PMC3725149 fatcat:zz5j4yzcofethaovzqbec4oxii

Using perception-based filtering to hide shadow artifacts

Felix Kreuzer, Michael Wimmer, Michael Hecher
2017
Combining filtering techniques with shadow mapping is a common tool to simulate visually pleasing shadows in interactive applications.  ...  We set up and execute a user study to find the optimal relation between the shadow-map sampling frequency and the filter radius.  ...  Acknowledgements I would like to thank my friends and family for their love and support. I would also like to thank my supervisors Michael Hecher and Michael Wimmer for their support.  ... 
doi:10.34726/hss.2017.37826 fatcat:rgudvtkkcze4tkf5o5kwlcrtpm

A lightweight in-place implementation for software thread-level speculation

Cosmin E. Oancea, Alan Mycroft, Tim Harris
2009 Proceedings of the twenty-first annual symposium on Parallelism in algorithms and architectures - SPAA '09  
We strive to reduce the size of TLS-related conflict-detection state, and to interact well with typical data-cache implementations.  ...  TLS implementations can be slow because speculative reads must consult look-aside tables to see earlier speculative writes, or because speculative operations replace normal reads and writes with expensive  ...  The anti-and output-dependency violations (WAR/WAW) are detected in line 8 of specLD and line 4 of specST and the proofs are similar.  ... 
doi:10.1145/1583991.1584050 dblp:conf/spaa/OanceaMH09 fatcat:j337tnmw2neyxpd5tyzlxypc2m
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