| 摘要 |
PROBLEM TO BE SOLVED: To provide an image processing device and an image processing method which suppress the deterioration of image quality minimum even when an image is printed on paper, and which can reliably detect and decode information embedded in the image. SOLUTION: A pattern preparing portion 14 prepares, two patterns having a characteristic that, when corresponding pixels in two patterns are added to each other, all of elements become zero; and a characteristic, when all of pixels in each of patterns are added to each other the added pixels become zero, each of patterns has two edges vertical and horizontal through a center portion, absolute values of pixel values in each pattern are the largest at a center thereof and the absolute values of pixel values in each pattern decrease as being away from the center thereof, and both are rectangular blocks of n×m pixels. A pattern selecting portion 20 selects one of the two patterns in response to additional information, and embeds the additional information superimposed by a pattern superimposing portion 21 to the input image data; based on a pattern size, an embedding strength, and a pattern attenuation ratio. COPYRIGHT: (C)2004,JPO |
