* International Journal on Document Analysis and Recognition.2022 * 11 pages, 6 figures. This preprint, which was originally written on 8
April 2021, has not undergone peer review or any post-submission improvements
or corrections. The Version of Record of this article is published in the
International Journal on Document Analysis and Recognition, and is available
online at https://doi.org/10.1007/s10032-022-00406-7 and
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