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In [[mathematics]], the '''collage theorem''' characterises an [[iterated function system]] whose [[attractor]] is close, relative to the [[Hausdorff metric]], to a given set. The IFS described is composed of [[contraction mapping|contractions]] whose images, as a '''collage''' or [[Union (set theory)|union]] when mapping the given set, are arbitrarily close to the given set. It is typically used in [[fractal compression]]. | |||
== Statement of the theorem == | |||
Let <math>\mathbb{X}</math> be a [[complete metric space]]. Let <math>L \in H(\mathbb{X})</math> be given, and let <math>\epsilon \geq 0</math> be given. Choose an [[iterated function system]] (IFS) <math>\{ \mathbb{X} ; w_1, w_2, \dots, w_N\}</math> with contractivity factor <math>0 \leq s < 1</math>, so that | |||
:<math>h\left( L, \bigcup_{n=1}^N w_n (L) \right) \leq \varepsilon,</math> | |||
where <math>h(d)</math> is the Hausdorff metric. Then | |||
:<math>h(L,A) \leq \frac{\varepsilon}{1-s}</math> | |||
where ''A'' is the attractor of the IFS. Equivalently, | |||
:<math>h(L,A) \leq (1-s)^{-1} h\left(L,\cup_{n=1}^N w_n(L)\right) \quad \text{for all } L \in {H}(\mathbb{X}).</math> | |||
==See also== | |||
* [[Michael Barnsley]] | |||
== References == | |||
*{{cite book | |||
| author = Barnsley, Michael. | |||
| title = Fractals Everywhere | |||
| year = 1988 | |||
| publisher = Academic Press, Inc. | |||
| isbn = 0-12-079062-9 | |||
}} | |||
==External links== | |||
* [http://www.cut-the-knot.org/ctk/ifs.shtml A description of the collage theorem and interactive Java applet] at [[cut-the-knot]]. | |||
* [http://www.math.okstate.edu/mathdept/dynamics/lecnotes/node47.html Notes on designing IFSs to approximate real images.] {{Dead link|date=August 2010}} | |||
* [http://scimath.unl.edu/MIM/files/MATExamFiles/Snyder_MAT_Exam_ExpositoryPaper.pdf Expository Paper on Fractals and Collage theorem] | |||
{{DEFAULTSORT:Collage Theorem}} | |||
[[Category:Fractals]] | |||
[[Category:Theorems in geometry]] | |||
{{math-stub}} |
Revision as of 00:58, 3 October 2013
In mathematics, the collage theorem characterises an iterated function system whose attractor is close, relative to the Hausdorff metric, to a given set. The IFS described is composed of contractions whose images, as a collage or union when mapping the given set, are arbitrarily close to the given set. It is typically used in fractal compression.
Statement of the theorem
Let be a complete metric space. Let be given, and let be given. Choose an iterated function system (IFS) with contractivity factor , so that
where is the Hausdorff metric. Then
where A is the attractor of the IFS. Equivalently,
See also
References
- 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
External links
- A description of the collage theorem and interactive Java applet at cut-the-knot.
- Notes on designing IFSs to approximate real images. Template:Dead link
- Expository Paper on Fractals and Collage theorem
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