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[Bruce Johnson]

I have used it, and it's a godsend for getting ancient data into useable form.

On Feb 8, 2011, at 12:13 PM, Dave Braze wrote:

> 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.
> 
> -D
> 
> On 2:59 PM, Allen.Windhorn at emerson.com wrote:
>> Greetings:
>> 
>> 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.
>> 
>> Regards,
>> Allen
> 
> -- 
> 
> 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
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> 
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-- 
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs