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ACM Transactions on Graphics (TOG), Volume 25 Issue 4, October 2006

Computing contour generators of evolving implicit surfaces
Simon Plantinga, Gert Vegter
Pages: 1243-1280
DOI: 10.1145/1183287.1183288
The contour generator is an important visibility feature of a smooth object seen under parallel projection. It is the curve on the surface which seperates front-facing from back-facing regions. The apparent contour is the projection of the contour...

Parametrizations for triangular Gk spline surfaces of low degree
Hartmut Prautzsch, Georg Umlauf
Pages: 1281-1293
DOI: 10.1145/1183287.1183289
In this article, we present regularly parametrized Gk free-form spline surfaces that extend box and half-box splines over regular triangular grids. The polynomial degree of these splines is max{4k + 1,...

Vector field design on surfaces
Eugene Zhang, Konstantin Mischaikow, Greg Turk
Pages: 1294-1326
DOI: 10.1145/1183287.1183290
Vector field design on surfaces is necessary for many graphics applications: example-based texture synthesis, nonphotorealistic rendering, and fluid simulation. For these applications, singularities contained in the input vector field often cause...

Video-guided motion synthesis using example motions
Min Je Park, Min Gyu Choi, Yoshihisa Shinagawa, Sung Yong Shin
Pages: 1327-1359
DOI: 10.1145/1183287.1183291
Video taken from a single monocular camera is the most common means of recording human motion. In this article, we present a practical, semiautomatic method for synthesizing a human motion that is guided by such video. After preprocessing an input...

Deringing cartoons by image analogies
Guangyu Wang, Tien-Tsin Wong, Pheng-Ann Heng
Pages: 1360-1379
DOI: 10.1145/1183287.1183292
In this article, we propose a novel method to reduce ringing artifacts in BDCT-encoded cartoon images using image analogies. The quantization procedure of BDCT compression (such as JPEG and MPEG) introduces annoying visual artifacts. Our main focus...

Encoding of high dynamic range video with a model of human cones
J. H. Van Hateren
Pages: 1380-1399
DOI: 10.1145/1183287.1183293
A recently developed quantitative model describing the dynamical response characteristics of primate cones is used for rendering high dynamic range (HDR) video. The model provides range compression, as well as luminance-dependent noise suppression....

Animation space: A truly linear framework for character animation
Bruce Merry, Patrick Marais, James Gain
Pages: 1400-1423
DOI: 10.1145/1183287.1183294
Skeletal subspace deformation (SSD), a simple method of character animation used in many applications, has several shortcomings; the best-known being that joints tend to collapse when bent. We present animation space, a generalization of SSD...

Mean value coordinates for arbitrary planar polygons
Kai Hormann, Michael S. Floater
Pages: 1424-1441
DOI: 10.1145/1183287.1183295
Barycentric coordinates for triangles are commonly used in computer graphics, geometric modeling, and other computational sciences because they provide a convenient way to linearly interpolate the data that is given at the corners of a triangle. The...

An alternative for Wang tiles: colored edges versus colored corners
Ares Lagae, Philip Dutré
Pages: 1442-1459
DOI: 10.1145/1183287.1183296
In this article we revisit the concept of Wang tiles and introduce corner tiles, square tiles with colored corners. During past years, Wang tiles have become a valuable tool in computer graphics. Important applications of Wang tiles include texture...

Periodic global parameterization
Nicolas Ray, Wan Chiu Li, Bruno Lévy, Alla Sheffer, Pierre Alliez
Pages: 1460-1485
DOI: 10.1145/1183287.1183297
We present a new globally smooth parameterization method for the triangulated surfaces of arbitrary topology. Given two orthogonal piecewise linear vector fields defined over the input mesh (typically the estimated principal curvature directions),...