Documentation for CROHMELib and the Label Graph Evaluation Library is available.

• CROHME InkML file viewer (for the CROHME 2013 competition).
  
  
• CROHMELib (*Update (April 28): (see documentation page for details): a series of translators between label graph (.lg) and CROHME .inkml files for the CROHME 2013 competition. This includes the program mergeLgCrohme, which translates a label graph and its CROHME .inkml input into a CROHME .inkml file containing segmentation and layout information as MathML (requires LgEval 0.2, available below). CROHMELib requires the TXL programming language, which is available for free on a variety of platforms. CROHMELib is distributed under the same Creative Commons license as used for LgEval (see below).
  
  
• Label Graph Evaluation Library (LgEval) (*Update (April 27): version 0.2.10 now released): (R. Zanibbi and Harold Mouchere). This Python library was used to produce results for our paper with Christian Viard-Gaudin at DRR XX (2013), Evaluating structural pattern recognition for handwritten math via primitive label graphs. System outputs, data, metric files and results summaries used to produce the label graph results in the paper are available here: CROHME 2012 Part 3 Label Graph Metric Results.

  We ask that you please cite our paper if you use LgEval for your own work.

  LgEval allows structural pattern recognition evaluation to be performed at the level of primitives, for example handwritten strokes for online data, or connected-components in images. The label graph representation allows simple, specific identification of recognition errors, with intuitive Hamming distance-based metrics to quantify classification, segmentation, and structural errors. Some features of the library include:

  • Primitive and Object-Level Evaluation: compute classification, segmentation and parsing errors for primitives using Hamming distances over labels, along with recall and precision of segments (i.e. objects) and segment relationships. The representation is also able to handle the case where one or both files have missing primitives.
  • Error Analysis: '.diff' files (in CSV format) identify specific errors.
  • Visualization: tools are provided to create .dot files (for GraphViz) for visualizing structure, and differences in structure between label graphs.
  • Conversion Tools: tools are provided for converting label graphs to LaTeX strings or other math encodings, along with a perl program that converts CROHME InkML files to label graph files.
  • Flexible: the system is designed to make it easy to evaluate individual pairs of files, or large groups, while being able to easily combine metric ('.m', also CSV format) files to summarize results from different comparisons.

  
  The LgEval library and CROHME 2012 label graph results are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

Other Math Search and Recognition Software

• $m_{\mathrm{in}}$(math input) math search interface. The program runs on iPads as well as laptops and desktop machines. [Note: on laptops and desktops, you may need to widen your browser window to make the expression and text entry boxes visible].
• [Earlier work] Web-based Math Entry Interface and other tools developed during the lab's participation in the ICDAR 2011 online pen-based math entry recognition competition.
• Freehand Formula Entry System, an early pen-based equation editor is maintained by the lab. The last version was released August 10, 2007.
• XPress (M. Pollanen, Trent University, Canada): a mouse-and-keyboard based math entry interface that makes use of the DRACULAE parser from FFES (video demonstration).