| 摘要 |
PROBLEM TO BE SOLVED: To easily and surely inspect a dot-like defect articulately existent on an inspection image, which is obtained by picking up the image of printed matter, together with a picture. SOLUTION: The printed matter inspecting device is provided with an edge image generating circuit 34 for preparing respective edge images by extracting the edges of picture from respective R, G and B inspection images, a threshold generating circuit 36 for preparing a threshold image for making an edge part in the picture of the edge image from each of respective R, G and B reference images, a maximum RGB value selecting circuit 40 for preparing one composite threshold image with a maximum value as a pixel value of a relevant pixel by finding the maximum value from the luminance values of respective correspondent pixels concerning the respective R, G and B threshold images, a mask circuit 42 for preparing respective R, G and B masked edge images by making the respective R, G and B edge images with the composite threshold image, and means 44-48 for detecting a print defect on the basis of the respective masked edge images. |
