| 摘要 |
PROBLEM TO BE SOLVED: To correct the shift from an expected position automatically by providing a reference point on the test chart of a printed matter, shifting an image input section to a position where the reference point comes within an image pick up range, picking up the image and storing a luminance data in a frame memory, and then storing the position of a pixel corresponding to the reference point as an expected position while the image pick up position as an expected position for correction. SOLUTION: An image input camera 1 has a lens for picking up the image of a printed matter 11 on which a test chart 12 is printed. Image of the printed matter 11 being set at a predetermined position by means of the positioning stopper 15 on a stage 14 is then picked up and converted, at an A/D converting section 3, into a luminance data and stored at each pixel on the frame memory 9. The camera 1 and stage 14 are shifted along the directions 16, 17 such that a reference point 13 on a chart 12 comes within the view of camera 1 by means of a feeder control sections 10 and feeders 2-1, 2-2. Position of the camera 1 is then set and the image is picked and converted into a luminance data before being stored in the memory 9. Difference of luminance between respective pixels is compared and stored in a memory 8. |
