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The ability of computer graphics to represent images
symbolically has so far been used mostly to render existing models
with greater clarity or with greater visual appeal. In this work, we
present a method aimed at harnessing this symbolic representation
power to increase the expressiveness of the 3D models themselves. We
achieve this through modification of the actual representation of 3D
shapes rather than their images. In particular, we focus on 3D
collage creation, namely, a generation of compound representations
of objects. More... |
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Surface Reconstruction using Local
Shape Priors
Ran Gal,
Ariel Shamir,
Tal Hassner,
Mark Pauly and
Daniel Cohen-Or
Eurographics
Symposium on Geometry Processing (SGP) 2007
We present an example-based surface reconstruction
method for scanned point sets. Our approach uses a database of local
shape priors built from a set of given context models that are
chosen specifically to match a specific scan. Local neighborhoods of
the input scan are matched with enriched patches of these models at
multiple scales. Hence, instead of using a single prior for
reconstruction, our method allows specific regions in the scan to
match the most relevant prior that fits best. Such high confidence
matches carry relevant information from the prior models to the
scan, including normal data and feature classification, and are used
to augment the input point-set.
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Pose Oblivious Shape Signature
Ran Gal,
Ariel Shamir and
Daniel Cohen-Or
IEEE Transactions on Visualization and Computer Graphics 2007 |
Application Demo
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In this paper we introduce an effective shape
signature which is also pose-oblivious. This means that the
signature is also insensitive to transformations which change the
pose of the 3D shape such as skeletal articulations. Although some
topology-based matching methods can be considered pose-oblivious as
well, our new signature retains the simplicity and speed of
signature indexing.
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We present a method for inhomogeneous 2D texture mapping guided by a
feature mask, that preserves some regions of the image, such as
foreground objects or other prominent parts. The method is able to
arbitrarily warp a given image while preserving the shape of its
features by constraining their deformation to be a similarity
transformation.
More... |
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The ability of computer graphics to represent images
symbolically has so far been used mostly to render existing models
with greater clarity or with greater visual appeal. In this work, we
present a method aimed at harnessing this symbolic representation
power to increase the expressiveness of the 3D models themselves. We
achieve this through modification of the actual representation of 3D
shapes rather than their images. In particular, we focus on 3D
collage creation, namely, a generation of compound representations
of objects. More... |
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This paper introduces a method for mesh editing,
aimed at preserving shape and volume. The method is based upon two
new developments: The first is a rotation field functional
expressing the distance measure between two isometric surfaces. The
second is a local volume analysis linking the volume of an object to
its boundary curvature.
More... |
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Harmonic colors are sets of colors that are
aesthetically pleasing in terms of human visual perception. In this
paper, we present a method that enhances the harmony among the
colors of a given photograph or of a general image, while remaining
faithful, as much as possible, to the original colors.
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We introduces a method for partial matching of
surfaces represented by triangular meshes. Our method matches
surface regions that are numerically and topologically dissimilar,
but approximate similar regions. We introduce novel local surface
descriptors which efficiently represent the geometry of local
regions of the surface. The descriptors are defined independently of
the underlying triangulation, and form a compatible representation
that allows matching of surfaces with different triangulations. To
cope with the combinatorial complexity of partial matching of large
meshes, we introduce the abstraction of salient geometric features
and present a method to construct them.
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| "That's why it's always worth having a few philosophers around the
place. One minute it's all Is Truth Beauty and Is Beauty Truth, and Does
A Falling Tree in the Forest Make A Sound if There's No one There to Hear
It, and then just when you think they're going to start dribbling one of
'em says, Incidentally, putting a thirty-foot parabolic reflector on a high
place to shoot the rays of the sun at an enemy's ships would be a very interesting
demonstration of optical principles." -- The many and varied advantages
of philosophy (Terry Pratchett, Small Gods)
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