| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem of a conventional image processing unit that cannot have matched a level of a dot pattern added actually to an image resulting in obtaining a remarkable dot pattern of an image outputted from one unit and in causing a difficulty of extracting the dot pattern of an image outputted from other unit because the level of the dot pattern differs depending on an individual unit difference and a lapse of an operating time even when the level of the dot pattern to be added-on is kept the same. SOLUTION: A sample image to which 5 stages of add-on levels are set is outputted (S1), and a reader reads the sample image (S2). Then an add-on level α able to extract the dot pattern is discriminated (S3), and the add-on level α is set to an add-on section (S4). |
