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Skew detection in document images

Abstract : Skew angle in a document image is estimated using operators known from mathematical morphology. Skew angle in a document image is estimated by run-length smoothing the image and then producing a plurality of eroded run-length-smoothed images. The run-length-smoothed image is eroded using a linear structuring element oriented at each of a plurality of different angles. The angle of the linear structuring element which produces an eroded image having the greatest surface area is designated as the skew angle. A plurality of run-length-smoothed images may be produced, each generated by smoothing the document image using a linear structuring element oriented at a respective different angle. Then each run-length smoothed image is eroded using a linear structuring element oriented at the corresponding angle.
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https://hal.archives-ouvertes.fr/hal-00715409
Contributor : Laurent Najman <>
Submitted on : Friday, July 6, 2012 - 11:34:15 PM
Last modification on : Wednesday, February 26, 2020 - 7:06:05 PM

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  • HAL Id : hal-00715409, version 1

Citation

Laurent Najman. Skew detection in document images. France, Patent n° : EP 1 394 725 A1. 2004, pp.16. ⟨hal-00715409⟩

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