Results 1 - 10 of 10,416

Reconstruction of visual appearance

by Peter R. J. North - Proc. of the BMVC , 1990
"... This paper presents a method for reconstructing the visual appearance of a scene from any viewpoint, given a collection of stereo pairs. A representation is suggested which is flexible and efficient, and algorithms to recover three dimensional structure and grey-level detail by combining a number of ..."
Abstract - Cited by 2 (1 self) - Add to MetaCart
This paper presents a method for reconstructing the visual appearance of a scene from any viewpoint, given a collection of stereo pairs. A representation is suggested which is flexible and efficient, and algorithms to recover three dimensional structure and grey-level detail by combining a number

Visual Appearance of Matte Surfaces

by Shree Nayar, Michael Oren - Science , 1995
"... All visual sensors, biological and artificial, are finite in resolution by necessity. This causes the effective reflectance of surfaces in a scene to vary with magnification. A reflectance model for matte surfaces is described that captures the effect of macroscopic surface undulations on image brig ..."
Abstract - Cited by 22 (5 self) - Add to MetaCart
All visual sensors, biological and artificial, are finite in resolution by necessity. This causes the effective reflectance of surfaces in a scene to vary with magnification. A reflectance model for matte surfaces is described that captures the effect of macroscopic surface undulations on image

ON THE VISUAL APPEARANCE OF RELATIVISTIC OBJECTS

by Jack Morava , 2007
"... Abstract. It has been almost half a century since Terrell noted that an object moving at relativistic speeds (and observed by light reflected from some point source) is seen not as squashed (as a naive interpretation of the Lorentz-Fitzgerald contraction would suggest) but rather as rotated, through ..."
Abstract - Add to MetaCart
when the object crosses the y-axis; thus ˜ψ = ψ − π/2, where ψ is the angle of observation used in Taylor’s calculations. A relativistic ray-tracing argument now shows that the observed object will appear to us as rotated counterclockwise through an angle φ, satisfying the equation [Taylor X-12 p. 356

Retrieving Images by Similarity of Visual Appearance

by S. Ravela, R. Manmatha - Workshop on Content Based Access of Image Databases (with CVPR , 1997
"... A system to retrieve images using a description of visual appearance is presented. A multi-scale invariant vector representation is obtained by first filtering images in the database with Gaussian derivative filters at several scales and then computing low order differential invariants. The multi-sc ..."
Abstract - Cited by 15 (0 self) - Add to MetaCart
A system to retrieve images using a description of visual appearance is presented. A multi-scale invariant vector representation is obtained by first filtering images in the database with Gaussian derivative filters at several scales and then computing low order differential invariants. The multi

Active Appearance Models Revisited

by Iain Matthews, Simon Baker - International Journal of Computer Vision , 2003
"... Active Appearance Models (AAMs) and the closely related concepts of Morphable Models and Active Blobs are generative models of a certain visual phenomenon. Although linear in both shape and appearance, overall, AAMs are nonlinear parametric models in terms of the pixel intensities. Fitting an AAM to ..."
Abstract - Cited by 462 (39 self) - Add to MetaCart
Active Appearance Models (AAMs) and the closely related concepts of Morphable Models and Active Blobs are generative models of a certain visual phenomenon. Although linear in both shape and appearance, overall, AAMs are nonlinear parametric models in terms of the pixel intensities. Fitting an AAM

Texture Characterization of the Visual Appearance of Paintings

by unknown authors
"... A texture characterization method has been explored to model the visual appearance of paintings, before and after a surface treatment. A preliminary experiment has been conducted to test the texture feature vectors before and after varnishing with Grumbacher’s Picture Varnish liquid. Numerical funct ..."
Abstract - Add to MetaCart
A texture characterization method has been explored to model the visual appearance of paintings, before and after a surface treatment. A preliminary experiment has been conducted to test the texture feature vectors before and after varnishing with Grumbacher’s Picture Varnish liquid. Numerical

Learning to Share Visual Appearance for Multiclass Object Detection

by Ruslan Salakhutdinov, Antonio Torralba, Josh Tenenbaum
"... We present a hierarchical classification model that allows rare objects to borrow statistical strength from related objects that have many training examples. Unlike many of the existing object detection and recognition systems that treat different classes as unrelated entities, our model learns both ..."
Abstract - Cited by 58 (3 self) - Add to MetaCart
both a hierarchy for sharing visual appearance across 200 object categories and hierarchical parameters. Our experimental results on the challenging object localization and detection task demonstrate that the proposed model substantially improves the accuracy of the standard single object detectors

Statecharts: A Visual Formalism For Complex Systems

by David Harel , 1987
"... We present a broad extension of the conventional formalism of state machines and state diagrams, that is relevant to the specification and design of complex discrete-event systems, such as multi-computer real-time systems, communication protocols and digital control units. Our diagrams, which we cal ..."
Abstract - Cited by 2704 (56 self) - Add to MetaCart
manageable and comprehensible. In fact, we intend to demonstrate here that statecharts counter many of the objections raised against conventional state diagrams, and thus appear to render specification by diagrams an attractive and plausible approach. Statecharts can be used either as a stand

A Model of Saliency-based Visual Attention for Rapid Scene Analysis

by Laurent Itti, Christof Koch, Ernst Niebur , 1998
"... A visual attention system, inspired by the behavior and the neuronal architecture of the early primate visual system, is presented. Multiscale image features are combined into a single topographical saliency map. A dynamical neural network then selects attended locations in order of decreasing salie ..."
Abstract - Cited by 1748 (72 self) - Add to MetaCart
Primates have a remarkable ability to interpret complex scenes in real time, despite the limited speed of the neuronal hardware available for such tasks. Intermediate and higher visual processes appear to select a subset of the available sensory information before further processing [1], most likely

Learning, Positioning, and Tracking Visual Appearance

by Shree K. Nayar, Hiroshi Murase, Sameer A. Nene - Proc. of IEEE Int'l. Conf. on Robotics and Automation , 1994
"... The problem of vision-based robot positioning and tracking is addressed. A general learning algorithm is presented for determining the mapping between robot position and object appearance. The robot is first moved through several displacements with respect to its desired position, and a large set of ..."
Abstract - Cited by 10 (6 self) - Add to MetaCart
The problem of vision-based robot positioning and tracking is addressed. A general learning algorithm is presented for determining the mapping between robot position and object appearance. The robot is first moved through several displacements with respect to its desired position, and a large set
Results 1 - 10 of 10,416