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Scientific publications of the Vision3D Lab

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Plane-Based Calibration for Linear Cameras

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Abstract Linear or 1D cameras are used in several areas such as industrial inspection and satellite imagery.Since 1D cameras consist of a linear sensor, a motion (usually perpendicular to the sensor orientation) is performed in order to acquire a full … Continue reading

Posted in ECCV, Jamil Draréni, Peter Sturm, Sébastien Roy | Leave a comment

Fast View Interpolation from Stereo: Simpler can be Better

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In this paper, we propose to rely only on images to generate novel views, and recall why modeling of the complete scene is often too expensive in the context of view interpolation. We investigate ways to achieve view interpolation by mean of forward and backward mapping. We present situations in which each one requires less computations and gives better results. Contrary to what we might expect, very simple stereo algorithms can produce very convincing interpolation despite providing really bad disparity maps. We propose to explain this with a probabilistic model of depth discontinuities. We test this model on synthetic data created to fit real image statistics and compare with images widely used in stereo. In practice, forward and backward mapping methods can rely on simple stereo algorithms running in real time, to produce very good results. A sequence of real images was acquired to allow accurate comparison of interpolated images, and standard metrics are used to assess the quality.
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Posted in 3DPVT, Nicolas Martin, Sébastien Roy | Tagged , | Leave a comment

Calibration of Cameras with Radially Symmetric Distortion

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Abstract We present algorithms for plane-based calibration of general radially distorted cameras. By this we understand cameras that have a distortion center and an optical axis such that the projection rays of pixels lying on a circle centered on the … Continue reading

Posted in Jean-Philippe Tardif, Martin Trudeau, PAMI, Peter Sturm, Sébastien Roy | Tagged , , , | Leave a comment

Reconstruction of the surface of the Sun from stereoscopic images

Abstract This thesis concentrates on the stereoscopic reconstruction of environments containing transparent objects. The data used to test the algorithms is graciously provided by NASA through the STEREO mission. This thesis proposes a new spherical rectification technique as well as … Continue reading

Posted in M.Sc., Vlad Lazar | Tagged , , , | 1 Comment

Reconstruction par Stéréo Photométrique

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Posted in Jamil Draréni, prédoc | Tagged , , | Leave a comment

(English) Plane-based Self-calibration of Radial Distortion

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Abstract We present an algorithm for plane-based self-calibration of cameras with radially symmetric distortions given a set of sparse feature matches in at least two views. The projection function of such cameras can be seen as a projection with a … Continue reading

Posted in ICCV, Jean-Philippe Tardif, Peter Sturm, Sébastien Roy | Tagged , | Leave a comment

Two-frame frequency-based estimation of local motion parallax direction in 3D cluttered scenes

V. Couture, M.S. Langer, A. Caine, R. Mann. Two-frame frequency-based estimation of local motion parallax direction in 3D cluttered scenes, 6th International Conference on 3-D Digital Imaging and Modeling, Montreal (Canada), August 2007, pp 357-364. Abstract When an observer moves … Continue reading

Posted in 3DIM, Publications, Vincent Couture | Tagged , , , | Leave a comment

(English) A Simple Oriented Mean-Shift Algorithm For Tracking

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Posted in ICIAR, Jamil Draréni, Sébastien Roy | Tagged , , | Leave a comment

(English) Algorithms for Batch Matrix Factorization with Application to Structure-from-Motion

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Sorry, this entry is only available in Français.

Posted in Adrien Bartoli, CVPR, Jean-Philippe Tardif, Martin Trudeau, Nicolas Guilbert, Sébastien Roy | Tagged | Leave a comment

Can Lucas-Kanade be used to estimate motion parallax in cluttered 3D scenes?

V. Couture and M.S. Langer. Can Lucas-Kanade be used to estimate motion parallax in cluttered 3D scenes?, 4th Canadian Conference on Computer and Robot Vision, Montreal (Canada), May 2007. Abstract When an observer moves in a 3D static scene, the … Continue reading

Posted in CRV, Publications, Vincent Couture | Tagged , , , | Leave a comment