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.windh...@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. br...@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@python.org http://mail.python.org/mailman/listinfo/image-sig
