| 摘要 |
An embedding area in which a background pattern can be embedded from the color document image (111, 233) is extracted (101, 212, 213, 214). At least one of a color and a shape of a background pattern appropriate for the embedding area is determined (102, 215) depending on an area color of the embedding area. A background pattern image (112) is generated (103, 216, 217) by embedding watermark information in the embedding area using the determined background pattern.
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