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# Fractal dimension

mathematics
A common type of fractal dimension is the Hausdorff-Besicovich Dimension, but there are several different ways of computing fractal dimension. Fractal dimension can be calculated by taking the limit of the quotient of the log change in object size and the log change in measurement scale, as the measurement scale approaches zero. The differences come in what is exactly meant by “object size” and what is meant by “measurement scale” and how to get an average number out of many different parts of a geometrical object. Fractal dimensions quantify the static *geometry* of an object.
For example, consider a straight line. Now blow up the line by a factor of two. The line is now twice as long as before. Log 2 / Log 2 = 1, corresponding to dimension 1. Consider a square. Now blow up the square by a factor of two. The square is now 4 times as large as before (i.e. 4 original squares can be placed on the original square). Log 4 / log 2 = 2, corresponding to dimension 2 for the square. Consider a snowflake curve formed by repeatedly replacing ___ with _/\_, where each of the 4 new lines is 1/3 the length of the old line. Blowing up the snowflake curve by a factor of 3 results in a snowflake curve 4 times as large (one of the old snowflake curves can be placed on each of the 4 segments _/\_). Log 4 / log 3 = 1.261… Since the dimension 1.261 is larger than the dimension 1 of the lines making up the curve, the snowflake curve is a fractal. [sci.fractals FAQ].

Tagged:

• Fractal compression

algorithm A technique for encoding images using fractals. Yuval Fisher’s fractal image compression site (http://inls.ucsd.edu/y/Fractals/). [Summary?] (1998-03-27)

• Fracted

[frak-tid] /ˈfræk tɪd/ adjective, Obsolete. 1. broken; having a part displaced.

• Fraction

[frak-shuh n] /ˈfræk ʃən/ noun 1. Mathematics. 2. Chemistry. (in a volatile mixture) a component whose range of boiling point temperatures allows it to be separated from other components by fractionation. 3. a part as distinct from the whole of anything; portion or section: The meeting started with a fraction of us present. 4. a […]

• Fractional

[frak-shuh-nl] /ˈfræk ʃə nl/ adjective 1. pertaining to ; comprising a part or the parts of a unit; constituting a : fractional numbers. 2. comparatively small; inconsiderable or insignificant: The profit on the deal was fractional. 3. Chemistry. of or noting a process, as distillation, crystallization, or oxidation, by which the component substances of a […]

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