OCR-D Browser

An extensible viewer for OCR-D mets.xml files

Screenshot

Installation on Ubuntu 18.04

sudo make deps-ubuntu
pip install browse-ocrd

Usage

browse-ocrd ./path/to/mets.xml # or open interactively

Features

• Browse fileGrps and pages, arranging views next to each other for comparison
• Show original or derived images (AlternativeImage on any level of the structural hierarchy)
• Show multiple images at once for different pages (horizontally) or different segments (vertically), zooming freely
• Show raw PAGE-XML with syntax highlighting, open with PageViewer
• Show concatenated PAGE-XML text annotation
• Show rendered HTML comparison from dinglehopper evaluations

Configuration

Configuration file locations

At startup the following directories a searched for a config file named ocrd-browser.conf

# directories and their default values under Ubuntu 20.04
GLib.get_system_config_dirs()  # '/etc/xdg/xdg-ubuntu/ocrd-browser.conf', '/etc/xdg/ocrd-browser.conf'
GLib.get_user_config_dir()     # '/home/jk/.config/ocrd-browser.conf'  
os.getcwd()                    # './ocrd-browser.conf'

Configuration file syntax

The ocrd-browser.conf file is an ini-file with the following keys:

[FileGroups]
# Preferred fileGrp names for thumbnail display in the Page Browser 
# Comma seperated list of regular expressions
preferredImages = OCR-D-IMG, OCR-D-IMG.*, ORIGINAL

# Each Tool has a section header [Tool XYZ]
# At the moment the only defined tool is "PageViewer"  
[Tool PageViewer]
# (ba)sh commandline to execute with placeholders  
commandline = /usr/bin/java -jar /home/jk/bin/JPageViewer/JPageViewer.jar --resolve-dir {workspace.directory} {file.path.absolute}

The commandline string will be used as a python format string with the keyword arguments:

• workspace : The current ocrd.Workspace, all properties get shell escaped (by shlex.quote) automatically.
• file : The current ocrd_models.OcrdFile, all properties get shell escaped (by shlex.quote) automatically, also there is an additional property path with the properties absolute and relative, so {file.path.absolute} will be replaced by the shell quoted absolute path of the file.

Note: You can get PRImA's PageViewer at Github.