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Automatic ground-truth generation for skew-tolerance evaluation of document layout analysis methods

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2 Author(s)
O. Okun ; Machine Vision & Media Process. Unit, Oulu Univ., Finland ; M. Pietikainen

Generation of ground-truths is of great importance for unbiased performance evaluation of document layout analysis methods. This is especially necessary because many methods are claimed to be skew-tolerant. However, experimental evaluation of this fact is often based only on human subjective judgement and restricted to a few experiments. The main obstacle for obtaining human-independent and more automated performance evaluation is that usually there are only ground-truths for upright images, i.e., images with no skew of text lines, because currently available ground-truthing techniques are too time-consuming. We propose a methodology of automatic generation of ground-truths for skewed images by using the ground-truths available for upright images. This methodology is simple and quite fast because processing is done at the level of small square blocks, but not at pixel level

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Pattern Recognition, 2000. Proceedings. 15th International Conference on  (Volume:4 )

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