Re: A Penny for Thought

*To*: mathgroup at smc.vnet.net*Subject*: [mg30123] Re: A Penny for Thought*From*: "Orestis Vantzos" <atelesforos at hotmail.com>*Date*: Sun, 29 Jul 2001 21:26:16 -0400 (EDT)*Organization*: National Technical University of Athens, Greece*References*: <9jvr7l$dns$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

I suppose you intend to scan the penny in grayscale and then import the image to Mathematica. If you do that, you will get a RasterArray. Then you must turn the Raster object into a normal matrix. Interpolate using ListInterpolation to get a function, which you can then use to get its contour plot('height map') and then differentiate once ('slope map') and twice('local curvature map'). Orestis <Moranresearch at aol.com> wrote in message news:9jvr7l$dns$1 at smc.vnet.net... > > I wish to aquire an image of a penny (1 cent) and display it as three > separate color coded countour maps > 1. height map: color corresponding to height > 2. slope map: the first derivative of height map > 3. local curvature map: the second derivative of height map > Any suggestions welcome. > Thank you. > John R Moran PhD, MD > >