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ACM Transactions on Graphics (TOG), Volume 31 Issue 5, August 2012

Micro perceptual human computation for visual tasks
Yotam Gingold, Ariel Shamir, Daniel Cohen-Or
Article No.: 119
DOI: 10.1145/2231816.2231817

Human Computation (HC) utilizes humans to solve problems or carry out tasks that are hard for pure computational algorithms. Many graphics and vision problems have such tasks. Previous HC approaches mainly focus on generating data in batch, to...

High-quality image deblurring with panchromatic pixels
Sen Wang, Tingbo Hou, John Border, Hong Qin, Rodney Miller
Article No.: 120
DOI: 10.1145/2231816.2231818

Image deblurring has been a very challenging problem in recent decades. In this article, we propose a high-quality image deblurring method with a novel image prior based on a new imaging system. The imaging system has a newly designed sensor...

A theory of monte carlo visibility sampling
Ravi Ramamoorthi, John Anderson, Mark Meyer, Derek Nowrouzezahrai
Article No.: 121
DOI: 10.1145/2231816.2231819

Soft shadows from area lights are one of the most crucial effects in high-quality and production rendering, but Monte-Carlo sampling of visibility is often the main source of noise in rendered images. Indeed, it is common to use deterministic...

Reflectance model for diffraction
Tom Cuypers, Tom Haber, Philippe Bekaert, Se Baek Oh, Ramesh Raskar
Article No.: 122
DOI: 10.1145/2231816.2231820

We present a novel method of simulating wave effects in graphics using ray-based renderers with a new function: the Wave BSDF (Bidirectional Scattering Distribution Function). Reflections from neighboring surface patches represented by local BSDFs...

Updated sparse cholesky factors for corotational elastodynamics
Florian Hecht, Yeon Jin Lee, Jonathan R. Shewchuk, James F. O'Brien
Article No.: 123
DOI: 10.1145/2231816.2231821

We present warp-canceling corotation, a nonlinear finite element formulation for elastodynamic simulation that achieves fast performance by making only partial or delayed changes to the simulation's linearized system matrices. Coupled with...

Simple formulas for quasiconformal plane deformations
Yaron Lipman, Vladimir G. Kim, Thomas A. Funkhouser
Article No.: 124
DOI: 10.1145/2231816.2231822

We introduce a simple formula for 4-point planar warping that produces provably good 2D deformations. In contrast to previous work, the new deformations minimize the maximum conformal distortion and spread the distortion equally across the...

Theory, analysis and applications of 2D global illumination
Wojciech Jarosz, Volker Schönefeld, Leif Kobbelt, Henrik Wann Jensen
Article No.: 125
DOI: 10.1145/2231816.2231823

We investigate global illumination in 2D and show how this simplified problem domain leads to practical insights for 3D rendering.

We first derive a full theory of 2D light transport by introducing 2D analogs to radiometric quantities such...

Video stabilization using epipolar geometry
Amit Goldstein, Raanan Fattal
Article No.: 126
DOI: 10.1145/2231816.2231824

We present a new video stabilization technique that uses projective scene reconstruction to treat jittered video sequences. Unlike methods that recover the full three-dimensional geometry of the scene, this model accounts for simple geometric...