We call get_app every where and we still get same variable reference. So it shows that we can get same object to be extended or to be used. It also can be called as an app or a plugin.
Edit fiddle - JSFiddle
Scan Tailor tutorial from Joseph Artsimovich on Vimeo.
Scan Tailor is an interactive post-processing tool for scanned pages. It performs operations such as page splitting, deskewing, adding/removing borders, and others. You give it raw scans, and you get pages ready to be printed or assembled into a PDF or DJVU file. Scanning, optical character recognition, and assembling multi-page documents are out of scope of this project.