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An image-based measure for evaluation of mathematical expression recognition. 6th Iberian Conference on Pattern Recognition and Image Analysis (IbPRIA), LNCS 7887, 2013. pp. 682-690.Mathematical expression recognition is an active research field that is related to document image analysis and typesetting. In this study, we present a novel global performance evaluation measure for mathematical expression recognition based on image matching. Using an image representation for evaluation tries to overcome the representation ambiguity as human beings do. The results of a recent competition were used to perform several experiments in order to analyze the benefits and drawbacks of this measure.