International Journal of Computer Vision
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The Applicability of Green's Theorem to Computation of Rate of Approach
International Journal of Computer Vision - Tập 31 Số 1 - Trang 83-98 - 1999
The rate of approach (ROA) of a moving observer toward a scene point, as estimated at a given instant, is proportional to the component of the observer's instantaneous velocity in the direction of the point. In this paper we analyze the applicability of Green's theorem to ROA estimation. We derive a formula which relates three quantities: the average value of the ROA for a surface patch in the sce...... hiện toàn bộ
A Variational Framework for Retinex
International Journal of Computer Vision - Tập 52 Số 1 - Trang 7-23 - 2003
Retinex theory addresses the problem of separating the illumination from the reflectance in a given image and thereby compensating for non-uniform lighting. This is in general an ill-posed problem. In this paper we propose a variational model for the Retinex problem that unifies previous methods. Similar to previous algorithms, it assumes spatial smoothness of the illumination field. In addition, ...... hiện toàn bộ
Diffeomorphisms Groups and Pattern Matching in Image Analysis
International Journal of Computer Vision - Tập 28 Số 3 - Trang 213-221 - 1998
In a previous paper, it was proposed to see the deformations of a common pattern as the action of an infinite dimensional group. We show in this paper that this approac h can be applied numerically for pattern matching in image analysis of digital images. Using Lie group ideas, we construct a distance between deformations defined through a metric given the cost of infinitesimal deformations. Then ...... hiện toàn bộ
Object Pose: The Link between Weak Perspective, Paraperspective, and Full Perspective
International Journal of Computer Vision - Tập 22 Số 2 - Trang 173-189 - 1997
Recently, DeMenthon and Davis (1992, 1995) proposed a method for determining the pose of a 3-D object with respect to a camera from 3-D to 2-D point correspondences. The method consists of iteratively improving the pose computed with a weak perspective camera model to converge, at the limit, to a pose estimation computed with a perspective camera model. In this paper we give an algebraic derivatio...... hiện toàn bộ
Are Edges Incomplete?
International Journal of Computer Vision - Tập 34 Số 2 - Trang 97-122 - 1999
We address the problem of computing a general-purpose early visual representation that satisfies two criteria. 1) Explicitness: To be more useful than the original pixel array, the representation must take a significant step toward making important image structure explicit. 2) Completeness: To support a diverse set of high-level tasks, the representation must not discard information of potential p...... hiện toàn bộ
The Earth Mover's Distance as a Metric for Image Retrieval
International Journal of Computer Vision - Tập 40 Số 2 - Trang 99-121 - 2000
We investigate the properties of a metric between two distributions, the Earth Mover's Distance (EMD), for content-based image retrieval. The EMD is based on the minimal cost that must be paid to transform one distribution into the other, in a precise sense, and was first proposed for certain vision problems by Peleg, Werman, and Rom. For image retrieval, we combine this idea with a representation...... hiện toàn bộ
A Multiphase Level Set Framework for Image Segmentation Using the Mumford and Shah Model
International Journal of Computer Vision - Tập 50 Số 3 - Trang 271-293 - 2002
We propose a new multiphase level set framework for image segmentation using the Mumford and Shah model, for piecewise constant and piecewise smooth optimal approximations. The proposed method is also a generalization of an active contour model without edges based 2-phase segmentation, developed by the authors earlier in T. Chan and L. Vese (1999. In Scale-Space'99, M. Nilsen et al. (Eds.), LNCS, ...... hiện toàn bộ
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