| 摘要 |
An information acquisition part 21 acquires fluctuation information fluctuating in real time, such as a time at the time of acquiring information. The write position setting part 23 obtains a write position of a tracing pattern 5 in image data based on the fluctuation information obtained by the information acquisition part 21 . The image processing part 13 applies image processing to the input image data, with the information specific to the apparatus turned into a tracing pattern and written in the write position. Therefore, by adding an anti-copying tracing pattern to different positions in the individual pages of the image data, the tracing pattern can be made hardly recognized.
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