“…In this work we are not aiming at exhaustively extracting all blackboard contents to create a lecture "handout" (Choudary & Liu, 2007;Zhang & He, 2004), nor we intend to apply trained-based handwritten recognition (Plötz, Thurau, & Fink, 2008;Wienecke, Fink, & Sagerer, 2005) but to extract only the most relevant blackboard features that visually summarize a blackboard-based recorded lecture.…”