dept. of visual contents, dongseo university 2008. 11. 24 seung il han hs12@dit.dongseo.ac.kr

A visual surveillance using real-time curve evolution based on the level-set method and pan-

tilt camera

Dept. of Visual Contents, Dongseo University

2008. 11. 24

Seung Il Han

hs12@dit.dongseo.ac.kr

Outline

23年 4月 21日INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

2

1. Objective2. Method of Real-time curve evolution

1. Composition of real-time curve evolution2. Advanced curve evolution method

3. The proposed system1. Binary process2. Active contour

4. Experiment5. Conclusion6. REFERENCE

Objective

23年 4月 21日3 INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

< Pan&Tilt Camera >

< Result of subtraction >

< Level Set > < Proposed >

Image subtraction

23年 4月 21日4 INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

< Near frame subtraction >< Background subtraction >

23年 4月 21日5

1. Method of Real-time curve evolution

INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

Composition of real-time curve evolution

23年 4月 21日6 INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

}\)x(x|x{ DythatsuchNyandLin

})x(\x|x{ ythatsuchNyandDLout

ntpoiteriorinanisif

Lif

Lif

tpoinexterioranisif

xxx

x

in

out

3

1

1

3

1

0

1

F Interior : ,

Lin :

Lout :

Exterior :

C :

1F

1F

3

3

1

0

1

outLF

x0(x) inLF

x0(x)

Process of real-time curve evolution

23年 4月 21日7 INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

< Advanced curve evolution >

No

No

Yes Yes

No

No

Yes

Scan Index in Two Line

Switch_in() Switch_out()

Eliminate redundantLout,Lin

Line end

Iteration

Next Index

1F

1

1F

1

23年 4月 21日8

2. The Proposed system

INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

The proposed system

23年 4月 21日9 INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

< Flow chart >

Image frame

Threshold movement

Movement

Active contour

Blob center in the range

Pen & Tilt camera

Pause subtraction & contour tracking

Loop

Yes

No

No

Yes

Yes

Levelset based tracking methodSubtraction

The proposed system

23年 4月 21日10 INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

When to move the camera

23年 4月 21日11 INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

< Pan & Tilt control>

23年 4月 21日12

3. Experiment & Conclusion

INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

Experiment

23年 4月 21日13 INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

< The proposed method >

< Conventional method >

Experiment

23年 4月 21日14 INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

< Continuous frame of proposed case >

Experiment

23年 4月 21日15 INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

< Continuous frame of conventional case>

Experiment

23年 4月 21日16 INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

< Center point in proposed case > < Center point in conventional case >

Conclusion

23年 4月 21日17 INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

References [1] Yonggang Shi, William Clem Karl, “A Real-Time Algorithm for

the Approximation of Level-Set-Based Curve Evolution”, vol.17, no.5, pp. 645-656, IEEE transactions on image processing, May 2008.

[2] S.Osher and J.Sethian, “Fronts propagation with curvature dependent speed: Algorithms based on Hamilton-Jacobi formulations” J.Comput. Phys., vol. 79, pp. 12-49, 1988.

[3] D.Peng, B.Merriman, S.Osher, H.Zhao, M.Kang, “APDE-based fast local level set method,” J. Comput. Phys., vol. 155, pp. 410-438, 1999.

[4] S.Osher, R.Fedkiw, “Level-Set Methods and Dynamic Implicit Surfaces.” pp. 17-24,pp. 119-137, New York: Springer Verlag, 2002.

[5] J.Sethian, “Level-Set Methods and Fast mat-ching Methods: Evolving Interfaces in Computat-ional Geometry, Fluid Mechanics, Computer Vision, and Materials Science.”, Cambridge, U.K.: Cambridge Univ. Press, 1999.

23年 4月 21日18 INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr

Thank You

23年 4月 21日19 INSTITUTE OF AMBIENT INTELIGENT, Han Seung Il, Dongseo Univ, E-mail : hs12@dongseo.ac.kr