Re: Welcome to the "Image-SIG" mailing list (Digest mode)
Bruce Johnson <[email protected]>
| Newsgroups | gmane.comp.python.image |
|---|---|
| Message-ID | <[email protected]> |
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, [email protected] 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. [email protected] > 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 - [email protected] > http://mail.python.org/mailman/listinfo/image-sig > -- Bruce Johnson University of Arizona College of Pharmacy Information Technology Group Institutions do not have opinions, merely customs _______________________________________________ Image-SIG maillist - [email protected] http://mail.python.org/mailman/listinfo/image-sig