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braze at haskins.yale.edu
Tue Feb 8 20:13:11 CET 2011
Maybe this will help (although I've not actually used it): http://datathief.org/
In the past I've done a similar thing using GSview and Ghostscript, which worked
but was fairly tedious.
On 2:59 PM, Allen.Windhorn at emerson.com wrote:
> This is a question probably more related to machine vision, but I want
> to digitize a lot of hand-drawn graphs that we have accumulated over
> the years. I would like to scan them, have a clerical person select a
> line on the graph (maybe in several spots), and get back a set of XY
> coordinates of the line. (A bonus would be to select points on the
> axes and enter the values to automatically do scaling.) To confound
> the process, there is a grid on the image, and there are several lines
> which may cross each other at various angles.
> My first thought is someone must have had this problem before and
> solved it -- if so, can I adapt your solution? (There was a product
> available commercially, but it didn't work worth a darn.)
> If not, can anyone suggest an approach? My first thought is to
> set an image threshold to convert it to ones and zeros, then do some
> kind of line-following algorithm that would take guidance from a
> human being. Fortunately, the desired data form smooth curves.
> It will be hard to discriminate between the line and the grid though.
Dave Braze, Ph.D. braze at haskins.yale.edu
Haskins Laboratories www.haskins.yale.edu/staff/braze.html
300 George Street, STE 900 phone: 1-203-865-6163 x241
New Haven, CT 06511-6624 fax: 1-203-865-8963
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