Join GitHub today
GitHub is home to over 20 million developers working together to host and review code, manage projects, and build software together.
Fetching latest commit…
Cannot retrieve the latest commit at this time.
|Failed to load latest commit information.|
Paperwalking is the codebase behind http://walking-papers.org. Copyright (C) 2009-2010, Michal Migurski <email@example.com> See INSTALL for a guide to installing Paperwalking. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. There are two main components here. 1. Site The user-facing website is written in PHP and MySQL, and has been developed to work adequately well in a commodity shared hosting environment, such as the Pair.com "webmaster" account I use to host Walking Papers. 2. Decoder The ugly math bits are done in an offline process that consumes a queue of freshly-scanned images from the main site, runs them through the image-recognition algorithm, and posts back georectified image tiles for editing. You can run a bunch of these in parallel to make jobs go faster, and they should be perfectly fine on small EC2 instances or a box plugged into plain old residential DSL. It's worth mentioning that the image recognition part of the work relies on a patented algorithm called SIFT: http://en.wikipedia.org/wiki/Scale-invariant_feature_transform