| 摘要 |
Character string heights and line spacing values are acquired as character string information on a document image, and fluctuations in the character string height and fluctuations in the line spacing value are calculated as variances. If the calculated variance is equal to or lower than a threshold value, the character string information is determined as being appropriate for use in extracting line-spacing watermarks, and line-spacing watermark information is extracted from the character string information.
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