| 摘要 |
PROBLEM TO BE SOLVED: To provide an image processor and an image processing method capable of minimizing a degradation in image quality due to embedding of a pattern, surely detecting and restoring information embedded in an image even when the image is magnified and reduced and skew is generated in the image. SOLUTION: In a pattern creation part 14, two patterns having characteristics that all elements become zero when corresponding pixels of two patterns are added together, all the pixels become zero when they are added together, having two vertical/horizontal edges through a center part, an absolute value of a pixel value is the largest at a center and becomes smaller as separating from the center and both have features of rectangular blocks of n x m pixels are created. A pattern selection part 20 constantly selects one pattern in a prescribed line/column, defines it as a synchronizing signal, selects the pattern according to additional information except the prescribed line/column and embeds the pattern in input image data by a pattern superposing part 21. In the case of restoration, exact skew correction and detection of a block position are performed by detecting the synchronizing signal and the additional information is restored. COPYRIGHT: (C)2004,JPO
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