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Re: get a table of coordinates from an image of a graph

  • To: mathgroup at smc.vnet.net
  • Subject: [mg112472] Re: get a table of coordinates from an image of a graph
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
  • Date: Thu, 16 Sep 2010 06:02:17 -0400 (EDT)
  • References: <i6q0jk$l41$1@smc.vnet.net>

Hi Peter,

I sometimes use the "Get Coordinates" tool (select graph, then shift-
period to activate the tool) to do this manually. First, I get the
coordinates of the origin and a few points on the axes to determine
the scale, and then use the tool to select and copy/paste as much of
the coordinates of the graph as needed. Would be cool if this would be
automated, but I am not aware of any Mathematica tool that does this.

Cheers -- Sjoerd

On Sep 15, 10:37 am, Peter Lindsay <p... at me.com> wrote:
> I don't know if this is even possible, but if it is then someone on this list will know:
>
> I have a jpg image with a "wobbly" line cartesian graph [ X-Y axes etc ].
>
> Is it possible by importing it, to get mathematica to "read" the graph and produce a table of coordinates ?
>
> Obviously the table could be scaled subsequently to produce desired results to match the original graph.
>
> Sorry if this is a daft question
>
> Peter Lindsay



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