| abstract |
The original image is read as a set of a plurality of pixels in which pixels adjacent in the main and sub-scan directions have different colors (R, G, B), and the pixels of each color read are read out for other pixels in the pixel. It is associated with the relative location information and stored in the line memory. Then, the stored pixels are sorted so that pixels of the same color are adjacent to each other, and abnormal pixels (dust) not present in the original image are detected based on the state of the sorted pixels. Accordingly, dust not present in the original image is detected without increasing the cost, and the dust is corrected so that the correction marks are not conspicuous. |