Xref: utzoo alt.fractals:1104 comp.theory.dynamic-sys:218 Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!elroy.jpl.nasa.gov!swrinde!mips!pacbell.com!ucsd!ucbvax!tut.cis.ohio-state.edu!dendrite.cis.ohio-state.edu!pollack From: pollack@dendrite.cis.ohio-state.edu (Jordan B Pollack) Newsgroups: alt.fractals,comp.theory.dynamic-sys Subject: Has automatic IFS code discovery been replicated? Message-ID: Date: 9 Apr 91 23:00:10 GMT Sender: news@tut.cis.ohio-state.edu Reply-To: pollack@cis.ohio-state.edu Followup-To: alt.fractals Distribution: alt Organization: Ohio State Computer Science Lines: 23 Barnsley's (1985, 1988) IFS work seems to be great stuff. He provides an iterative description of fractals which formally were described using recursive rewrite rules (e.g. mandelbrot's line segment grammars). And it is pretty clear how to "construct" IFS codes WITH A HUMAN IN THE LOOP, through manually shrinking and collaging the source image onto itself. But the idea of a program AUTOMATICALLY inverting a fractal to find IFS codes seems a trifle harder, and from my readings, the details of these algorithms have only been hinted at, not published, (ostensibly for crass commercial purposes.) Have I missed a key publication that reveals the secret? Does anyone has any references to researchers who have actually REPLICATED the algorithm or designed equivalent ones which can take raster images and find tiny IFS codes? -- Jordan Pollack Assistant Professor CIS Dept/OSU Laboratory for AI Research 2036 Neil Ave Email: pollack@cis.ohio-state.edu Columbus, OH 43210 Fax/Phone: (614) 292-4890