| 摘要 |
<p>PROBLEM TO BE SOLVED: To embed an additional image such as pattern image or the like in a main image without visual obstruction and deterioration. SOLUTION: A main image inputted to a D/A converter 21 is substantially drawn by means of a shading line screen that changes a line width corresponding to a density of the image to be outputted from a laser driving system 26. At the drawing by the laser driving system 26, a triangle wave generator 22, a triangle wave selection signal generator 24 and a selection circuit 23 change the drawing position of a pixel in the line width direction of the shading line screen corresponding to whether the position is in a region wherein an image part included in a pattern image in the main image is formed. A compactor 25 draws the pixel by means of the laser driving system 26 on the changed position by using the shading line screen.</p> |
