International Journal of Computer Vision
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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, ...
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...
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...
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...
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 ...
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...
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, ...
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