Filters








9,741 Hits in 5.5 sec

Inferring Road Boundaries Through and Despite Traffic

Tarlan Suleymanov, Paul Amayo, Paul Newman
2018 2018 21st International Conference on Intelligent Transportation Systems (ITSC)  
Our goal is to trace out, in an image, the projection of road boundaries irrespective of whether or not the boundary is actually visible.  ...  Our coupled approach first segments visible road boundaries with a fully convolutional network and then passes output to our deep network to infer occluded road boundaries.  ...  Range and intensity information from 3D LIDAR is used in [10] and visible curbs are detected using elevation data, which again fails in the presence of occluding obstacles.  ... 
doi:10.1109/itsc.2018.8569570 dblp:conf/itsc/SuleymanovA018 fatcat:coa4xgnn6ra4bggxwjb5pi2osm

Part-based 3D descriptions of complex objects from a single image

M. Zerroug, R. Nevatia
1999 IEEE Transactions on Pattern Analysis and Machine Intelligence  
The joint curve is not visible. The only case where the joint curve is not visible is when the part with its cross section facing away from the viewer occludes the other part (Fig. 7c ).  ...  Thus, the joints can be thought of as nonaccidental relationships whose presence in the image suggests certain labeling of boundaries.  ... 
doi:10.1109/34.790426 fatcat:zphvatl5lff2tatubwbf74ifj4

Seeing and visual reference

Kevin J. Lande
2021 Philosophy and Phenomenological Research  
In virtue of my current visual state or experience, I am aware of the size, shape, and color of the desk in front of me.  ...  Perception is a central means by which we come to represent and be aware of particulars in the world.  ...  segments of the shape's boundary as curved in the appropriate ways, and that representations of visible line segments as straight interfere with representations of nearby occluded boundary segments as  ... 
doi:10.1111/phpr.12859 fatcat:xevijj5ujngwxermaywiebby24

Description of solid shape and its inference from occluding contours

Jack M. H. Beusmans, Donald D. Hoffman, Bruce M. Bennett
1987 Optical Society of America. Journal A: Optics, Image Science, and Vision  
We show that the part boundaries of an object can be inferred from its occluding contours, at least up to a number of ambiguities.  ...  The boundaries between shapes joined through these operations are contours of extrema of a principal curvature.  ...  In that case we will have to infer the presence of these parabolic lines indirectly from the presence of other parabolic curves.  ... 
doi:10.1364/josaa.4.001155 fatcat:cg5outqiuvbrdo5jpvf4so2rci

ShieldTester: Cell-to-Cell Visibility Test for Surface Occluders

I. Navazo, J. Rossignac, J. Jou, R. Shariff
2003 Computer graphics forum (Print)  
ShieldTester may be used to establish that pairs of cells in a subdivision of space are hidden from each other by a relatively large surface occluder, so that when the viewer is in one cell, the objects  ...  Figure 1 : On the left, we can establish that the half-cow surface, S, is occluding cube A from cube B, because its intersection with the transparent tubular surface, T, contains a closed loop, C, that  ...  For example, the approach of 21 will not work for occluders that are surfaces with boundaries or even for very thin curved solid walls.  ... 
doi:10.1111/1467-8659.00676 fatcat:a3nigkgw6zgajfuvxb7uu33pyq

Visibility and its dynamics in a PDE based implicit framework

Y.-H.R. Tsai, L.-T. Cheng, S. Osher, P. Burchard, G. Sapiro
2004 Journal of Computational Physics  
Furthermore, we study the dynamics of shadow boundaries on the surfaces of the obstacles when the vantage point moves with a given trajectory.  ...  The visibility problem is formally formulated as a boundary value problem (BVP) of a first order partial differential equation. It is based on the continuation of values along the given ray field.  ...  INTRODUCTION In this paper, we consider the visibility problem described as follows: given a collection of hypersurfaces representing the boundaries of objects, called the occluders, in two or three dimensional  ... 
doi:10.1016/j.jcp.2004.02.015 fatcat:jystyk5ynfagzn4tfuxna3hxym

Computing exact shadow irradiance using splines

Michael M. Stark, Elaine Cohen, Tom Lyche, Richard F. Riesenfeld
1999 Proceedings of the 26th annual conference on Computer graphics and interactive techniques - SIGGRAPH '99  
We present a solution to the general problem of characterizing shadows in scenes involving a uniform polygonal area emitter and a polygonal occluder in arbitrary position by manifesting shadow irradiance  ...  Studying generalized prism-like constructions generated by the emitter and the occluder in a fourdimensional (shadow) space reveals a simpler intrinsic structure of the shadow as compared to the more complicated  ...  The authors wish to thank John Hughes, Brian Smits, and Peter Shirley for reading earlier drafts of this paper, and the reviewers for their comments.  ... 
doi:10.1145/311535.311552 dblp:conf/siggraph/StarkCLR99 fatcat:qy4udvtc4vbgfhwhy4kra5dcmi

Robust pupil center detection using a curvature algorithm

Danjie Zhu, Steven T. Moore, Theodore Raphan
1999 Computer Methods and Programs in Biomedicine  
This technique is robust and accurately estimates pupil center with less than 40% of the pupil boundary points visible.  ...  Occlusion of the boundary induces characteristic peaks in the curvature function.  ...  algorithm in the presence of a range of artifacts.  ... 
doi:10.1016/s0169-2607(98)00105-9 pmid:10386764 fatcat:5lybodbl2fb5diszi7uwvwjrr4

The role of convexity in perceptual completion: beyond good continuation

Zili Liu, David W. Jacobs, Ronen Basri
1999 Vision Research  
-in part due to the paucity of effective methodologies for examining the significance of various grouping cues.  ...  Since the seminal work of the Gestalt psychologists, there has been great interest in understanding what factors determine the perceptual organization of images.  ...  The research of Ronen Basri was supported in part by the United States-Israel Binational Science Foundation, grant No. 94-00100.  ... 
doi:10.1016/s0042-6989(99)00141-8 pmid:10755161 fatcat:k35fdydvwrdehdvsq4smx77msi

Selectivity of macaque inferior temporal neurons for partially occluded shapes

G Kovacs, R Vogels, GA Orban
1995 Journal of Neuroscience  
The presence of the (visible) occluder leads to identification of the boundaries as belonging to the shape or occluder, and thus, segmentation of shape borders and occluding pattern. with SI before being  ...  Indeed, both the decrease in neural response with increasing occluder density and the absence of any effect by occluder visibility on the shape selectivity, suggests that the presence of uncompleted shape  ... 
doi:10.1523/jneurosci.15-03-01984.1995 fatcat:zvlxmbidnbheljngfyd5v5kqqq

Dynamic Occlusion Analysis in Optical Flow Fields

William B. Thompson, Kathleen M. Mutch, Valdis A. Berzins
1985 IEEE Transactions on Pattern Analysis and Machine Intelligence  
The fundamental principal involved is that at an occlusion boundary, the image of the surface boundary moves with the image of the occluding surface.  ...  We then show how the approach can be extended to identify which side of a dynamic occlusion boundary corresponds to the occluding surface.  ...  The solid curve indicates the location of the curve if the edge moves with the surface to the left. to be correct.  ... 
doi:10.1109/tpami.1985.4767677 fatcat:ffgd7ncofngk3m5scniap75o3e

Proposing a Novel Three Triangles Geometrical Approach for Face Detection on Occluded Facial Features

Bikash Lamsal, Noriko Kojima, Naofumi Matsumoto
2016 Journal of the Institute of Industrial Applications Engineers  
Our proposed face detector then detects the presence of the face in an image even with an occlusion.  ...  In this paper, we have developed a system, that detects the presence of the facial features and the face from the still images even the facial components are occluded.  ...  In all of these figures the faces partially visible or occluded are detected except the figure a.  ... 
doi:10.12792/jiiae.4.192 fatcat:o3xvp574d5go5abfciekrbml34

Partial modal completion under occlusion: What do modal and amodal percepts represent?

T. R. Scherzer, V. Ekroll
2015 Journal of Vision  
In our experiments, subjects viewed an opaque disk with an open sector rotating in front of a background and indicated the perceived angular extent (a) of the occluder and (b) of the part of the background  ...  We confirm and extend this finding using a stimulus with a moving occluder. In agreement with Palmer et al.'  ...  Second, the results obtained with the real and illusory kinds of the opaque disk were essentially identical, which implies that more dots were experienced as simultaneously visible in the presence of the  ... 
doi:10.1167/15.1.22 pmid:25613760 fatcat:4vcwc2dztrby3ix3q6ufb4f2qq

In the Shadows, Shape Priors Shine: Using Occlusion to Improve Multi-region Segmentation

Yuka Kihara, Matvey Soloviev, Tsuhan Chen
2016 2016 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)  
We present a new algorithm for multi-region segmentation of 2D images with objects that may partially occlude each other.  ...  Our algorithm is based on the observation that human performance on this task is based both on prior knowledge about plausible shapes and taking into account the presence of occluding objects whose shape  ...  We would like to thank the Cornell AMP Lab, Kevin Matzen, Kyle Wilson, the Cornell Graphics and Vision group and the anonymous reviewers for support and helpful comments.  ... 
doi:10.1109/cvpr.2016.49 dblp:conf/cvpr/KiharaSC16 fatcat:kk6clekwqfhlpjqcqdtwypc64u

Geometry of shadows

David C. Knill, Pascal Mamassian, Daniel Kersten
1997 Optical Society of America. Journal A: Optics, Image Science, and Vision  
We show that the results obtained for point sources of light generalize in a straightforward way to extended light sources, under the assumption that light sources are convex.  ...  The results suggest that intrinsic shadows can be used to directly infer illuminant tilt, qualitative global surface structure, and, at intersections with surface creases, the concavity/convexity of a  ...  For surfaces with holes, this curve may be disjoint (i.e., the boundary may consist of two curves, for example, on the inside and outside of a donut).  ... 
doi:10.1364/josaa.14.003216 pmid:9392900 fatcat:yfz64vnz7zfybkrf26kkmbtqxm
« Previous Showing results 1 — 15 out of 9,741 results