# A variational model in image processing with focal points

ESAIM: Mathematical Modelling and Numerical Analysis (2008)

- Volume: 42, Issue: 5, page 729-748
- ISSN: 0764-583X

## Access Full Article

top## Abstract

top## How to cite

topBraides, Andrea, and Riey, Giuseppe. "A variational model in image processing with focal points." ESAIM: Mathematical Modelling and Numerical Analysis 42.5 (2008): 729-748. <http://eudml.org/doc/250363>.

@article{Braides2008,

abstract = {
We propose a model for segmentation problems
involving an energy concentrated on the vertices of an unknown
polyhedral set, where the contours of the images to be recovered
have preferred directions and focal points.
We prove that such an energy is obtained as a Γ-limit of
functionals defined on sets with smooth boundary that
involve curvature terms of the boundary.
The minimizers of the limit functional are polygons with
edges either parallel to some prescribed directions or pointing to some
fixed points, that can also be taken as unknown of the problem.
},

author = {Braides, Andrea, Riey, Giuseppe},

journal = {ESAIM: Mathematical Modelling and Numerical Analysis},

keywords = {Γ-convergence; curvature functionals;
segmentation problems; image processing.; -convergence; segmentation problems; image processing},

language = {eng},

month = {7},

number = {5},

pages = {729-748},

publisher = {EDP Sciences},

title = {A variational model in image processing with focal points},

url = {http://eudml.org/doc/250363},

volume = {42},

year = {2008},

}

TY - JOUR

AU - Braides, Andrea

AU - Riey, Giuseppe

TI - A variational model in image processing with focal points

JO - ESAIM: Mathematical Modelling and Numerical Analysis

DA - 2008/7//

PB - EDP Sciences

VL - 42

IS - 5

SP - 729

EP - 748

AB -
We propose a model for segmentation problems
involving an energy concentrated on the vertices of an unknown
polyhedral set, where the contours of the images to be recovered
have preferred directions and focal points.
We prove that such an energy is obtained as a Γ-limit of
functionals defined on sets with smooth boundary that
involve curvature terms of the boundary.
The minimizers of the limit functional are polygons with
edges either parallel to some prescribed directions or pointing to some
fixed points, that can also be taken as unknown of the problem.

LA - eng

KW - Γ-convergence; curvature functionals;
segmentation problems; image processing.; -convergence; segmentation problems; image processing

UR - http://eudml.org/doc/250363

ER -

## References

top- L. Ambrosio and A Braides, Functionals defined on partitions of sets of finite perimeter, I and II. J. Math. Pures. Appl.69 (1990) 285–305 and 307–333. Zbl0676.49028
- L. Ambrosio and V.M. Tortorelli, Approximation of functionals depending on jumps by elliptic functionals via Γ-convergence. Comm. Pure Appl. Math.43 (1990) 999–1036. Zbl0722.49020
- L. Ambrosio, N. Fusco and D. Pallara, Functions of Bounded Variation and Free Discontinuity Problems. Clarendon Press, Oxford (2000). Zbl0957.49001
- G. Aubert and P. Kornprobst, Mathematical problems in image processing. Partial differential equations and the calculus of variations. Springer, New York (2006). Zbl1110.35001
- G. Bellettini and R. March, An image segmentation variational model with free discontinuities and contour curvature. Math. Mod. Meth. Appl. Sci.14 (2004) 1–45. Zbl1044.49009
- G. Bellettini and L. Mugnai, Characterization and representation of the lower semicontinuous envelope of the elastica functional. Ann. Inst. Henri Poincaré, Anal. Non Linéaire21 (2004) 839–880. Zbl1110.49014
- G. Bellettini, G. Dal Maso and M. Paolini, Semicontinuity and relaxation properties of a curvature depending functional in 2D. Ann. Scuola Norm. Sup. Pisa (4)20 (1993) 247–297. Zbl0797.49013
- A. Blake and A. Zisserman, Visual Reconstruction. MIT Press, Cambridge, MA (1987).
- A. Braides, Approximation of Free-Discontinuity Problems, Lecture Notes in Mathematics. Springer-Verlag, Berlin (1998). Zbl0909.49001
- A. Braides, Γ-Convergence for Beginners. Oxford University Press, Oxford (2002). Zbl1198.49001
- A. Braides and A. Malchiodi, Curvature theory of boundary phases: the two-dimensional case. Interfaces Free Bound.4 (2002) 345–370. Zbl1029.49039
- A. Braides and R. March, Approximation by -convergence of a curvature-depending functional in visual reconstruction. Comm. Pure Appl. Math. 59 (2006) 71–121. Zbl1098.49012
- A. Braides, A. Chambolle and M. Solci, A relaxation result for energies defined on pairs set-function and applications. ESAIM: COCV13 (2007) 717–734. Zbl1149.49017
- A. Chambolle, Image segmentation by variational methods: Mumford and Shah functional and the discrete approximations. SIAM J. Appl. Math.55 (1995) 827–863. Zbl0830.49015
- A. Chambolle, Finite-differences discretizations of the Mumford-Shah functional. ESAIM: M2AN33 (1999) 261–288. Zbl0947.65076
- A. Chambolle and G. Dal Maso, Discrete approximation of the Mumford-Shah functional in dimension two. ESAIM: M2AN33 (1999) 651–672. Zbl0943.49011
- A. Coscia, On curvature sensitive image segmentation. Nonlin. Anal.39 (2000) 711–730. Zbl0942.68135
- G. Dal Maso, An Introduction to -Convergence. Birkhäuser, Boston (1993). Zbl0816.49001
- G. Dal Maso, J.M. Morel and S. Solimini, A variational method in image segmentation: existence and approximation results. Acta Math.168 (1992) 89–151. Zbl0772.49006
- C. Mantegazza, Curvature varifolds with boundary. J. Diff. Geom.43 (1996) 807–843. Zbl0865.49030
- R. March, Visual reconstruction with discontinuities using variational methods. Image Vis. Comput.10 (1992) 30–38.
- L. Modica and S. Mortola, Il limite nella -convergenza di una famiglia di funzionali ellittici. Boll. Un. Mat. Ital. A (5)3 (1977) 526–529. Zbl0364.49006
- J.M. Morel and S. Solimimi, Variational Methods in Image Segmentation, Progress in Nonlinear Differential Equations and Their Applications14. Birkhäuser, Basel (1995).
- D. Mumford, Elastica and computer vision, in Algebraic Geometry and its Applications (West Lafayette, IN 1990), Springer, New York (1994) 491–506. Zbl0798.53003
- D. Mumford and J. Shah, Optimal approximations by piecewise smooth functions and associated variational problems. Comm. Pure Appl. Math.42 (1989) 577–685. Zbl0691.49036
- M. Nitzberg, D. Mumford and T. Shiota, Filtering, Segmentation and Depth, in Lecture Notes in Computer Science662, Springer-Verlag, Berlin (1993). Zbl0801.68171
- M. Röger and R. Schätzle, On a modified conjecture of De Giorgi. Math. Z.254 (2006) 675–714. Zbl1126.49010
- J. Shah, Uses of elliptic approximations in computer vision, in Variational Methods for Discontinuous Structures, Birkhäuser, Basel (1996) 19–34. Zbl0871.65120
- J. Shah, A common framework for curve evolution, segmentation and anisotropic diffusion, in IEEE Conference on Computer Vision and Pattern Recognition, June (1996).

## NotesEmbed ?

topTo embed these notes on your page include the following JavaScript code on your page where you want the notes to appear.