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Moisés Pastor-i-Gadea, Alejandro H. Toselli, Enrique Vidal. Projection profile based algorithm for slant removal. Proceedings of the 2004 International Conference on Image Analysis and Recognition (ICIAR04), 2004.

The slant is one of the main sources of handwritten text variability. The slant is the clockwise angle between the vertical direction and the vertical text strokes. A well formalised and fast method to estimate the slant angle is presented. The method is based on the observation that the columns distribution of the vertical projection profile presents a maximum variance for the non slanted text. A comparative with Sobel operators convolution method and the Idiap slant method is provided.