| 摘要 |
An area information storage section (103) stores positional information on at least two target areas on the standard image of printed matter to be examined, the area of each of the target areas, their standard average densities, and the standard deviation of their density distribution. An average density computing section (104) calculates the average density for each target area in the image data supplied from the image input section (101) using positional information on each target area and its area supplied from the area information storage section. A density difference measuring means (105) measures, target area by target area, the density difference between the average density and the standard average density supplied from the area information storage section. A density difference normalizing section (106) normalizes the density difference and the standard deviation of the density distribution supplied from the area information storage section. On the basis of the added value of the normalized density difference for each of the target areas, a summing section (107) judges the degree of stain on the printed matter to be examined. <IMAGE> |
