gamera-tutorial

∗A Tutorial Introduction to the Gamera FrameworkChristoph DalitzHochschule Niederrhein, Fachbereich Elektrotechnik und InformatikReinarzstr. 49, 47805 Krefeld, GermanyVersion 1.4, 13. Sep 2011AbstractThe Gamera framework is a Python library for building custom applications for document analysisand recognition. Additionally, it allows for custom extensions. While its online documentation is anindispensable reference manual when working with Gamera, a beginner usually has trouble findinghis or her way through it. This tutorial hopes to bridge the gap by providing a kind of terse text bookon Gamera including exercises explaining the most common tasks.Contents1 Overview 21.1 Using Gamera . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.2 Extending Gamera . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Image Processing on the Python Side 32.1 Image creation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.2 Pixel access and image methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.3 Image views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42.4 Special operations for onebit images . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.4.1 Combining onebit images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.4.2 Color highlighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...