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johnson at pharmacy.arizona.edu
Tue Feb 8 20:44:34 CET 2011
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.
> 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
> Image-SIG maillist - Image-SIG at python.org
University of Arizona
College of Pharmacy
Information Technology Group
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