For citations:
OBYDENKOV D.O., FROLOV A.E., MARKIN Yu.V., FOMIN S.A., KONDRAT’EV B.V. Printed text documents watermarking based on vertical word shift and word fragments brightness changing. Proceedings of the Institute for System Programming of the RAS (Proceedings of ISP RAS). 2021;33(5):65-82. (In Russ.) https://doi.org/10.15514/ISPRAS-2021-33(5)-4
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