V1z em 02h28min de 10 de outubro de 2012

2012-10-10T02:28:26Z

← Edição anterior		Edição das 23h28min de 9 de outubro de 2012
Linha 1:		Linha 1:
	Why is a curve-based graphical representation important for 3D computer vision and structure from motion? This is an ongoing list of the reasons we can think of. Add your own!		Why is a curve-based graphical representation important for 3D computer vision and structure from motion? This is an ongoing (rather informal) list of the reasons we can think of. Add your own!

	== Main Reasons Why You Should Care About Curves ==		== Main Reasons Why You Should Care About Curves ==
Linha 33:		Linha 33:
	variations across views indicate surface curvature~\cite{Giblin:Motion:Book}.		variations across views indicate surface curvature~\cite{Giblin:Motion:Book}.

	== ~~Weaker~~ Reasons ==
			== Other Reasons ==

			* Powerful correlated statistics for matching etc: Points within curves co-occur. Co-occurrence of point features have been successfully explored by recent work by Noah Snavely et, al. very successfully to get good matches in very large scale models. This is sort of an "initial" form of geometry/shape information. In a curve, all points co-occur, which can potentially be very powerful.

	== Link ==		== Link ==

V1z: Nova página: Why is a curve-based graphical representation important for 3D computer vision and structure from motion? This is an ongoing list of the reasons we can think of. Add your own! == Main...

2012-10-10T02:23:40Z

Nova página: Why is a curve-based graphical representation important for 3D computer vision and structure from motion? This is an ongoing list of the reasons we can think of. Add your own! == Main...

Página nova

Why is a curve-based graphical representation important for 3D computer vision and structure from motion? This is an ongoing list of the reasons we can think of. Add your own!

== Main Reasons Why You Should Care About Curves ==

Curves arising from edge
discontinuities are denser and more structured than interest points, while
efficiently representing the image or 3D scene. They
provide a useful middle ground between a costly and redundant pixel/voxel
array representation and a very sparse, unstructured point cloud representation. This
allows the fast computation of 3D reconstructions that, although not
meshed, are still recognizable, structured and cheap to manipulate and store.
This representational efficiency is reflected by a recent trend in computer
graphics to use line-based renderings in low-resource internet-based
applications. The structural richness of curves can be illustrated by the fact
that it is impossible to register a new uncalibrated view to a given 3D point cloud (without
its originating images), but
given a 3D curve representation of the scene this task becomes plausible due to
the added structure (\eg, by reprojecting the 3D curves onto the new view
and aligning them to the curves detected in the image).
Furthermore, it is well-known
that edge-based representations can efficiently represent most of the image
content~\cite{Elder:Edges:IJCV99}, and this motivates an efficient 3D
curve-based reconstruction for storing the most relevant geometric information
of a 3D scene. Curves also have greater invariance than interest points to
changes in illumination, and are stable over a greater range of
baselines as compared to interest points. Curves have good localization in the
orthogonal direction at each point, and their long extent and richer structure
allows for more accurate detection, matching, and localization under a wider variety of
viewpoint changes than point features. Moreover, edge curve structure is
correlated with surface properties: the reflectance or ridge curves provide
boundary condition for surface reconstruction, while occluding contour
variations across views indicate surface curvature~\cite{Giblin:Motion:Book}.

== Weaker Reasons ==

== Link ==

http://www.lems.brown.edu/~rfabbri

== Author ==
Main author: Ricardo Fabbri, Ph.D. [http://www.lems.brown.edu/~rfabbri]

[[Category:Lab Macambira]]
[[Category:IPRJ]]

Why Curves - Histórico de revisão

V1z em 02h28min de 10 de outubro de 2012

V1z: Nova página: Why is a curve-based graphical representation important for 3D computer vision and structure from motion? This is an ongoing list of the reasons we can think of. Add your own! == Main...