Abstract: An image processing device for processing an image read by an image scanner or similar image reading device is disclosed. The image processing device is capable of accurately detecting, without resorting to a range finding sensor or similar special sensing means, the bound portion of a spread book by recognizing the configuration of the bound portion out of a read image, and thereby accurately correcting the distortion of the portion of the image representative of the bound portion.

Abstract: An image forming apparatus having a correcting function for preventing toner from scattering around edge portions of line images. The image forming apparatus includes an image paper sheet formed from an original image for testing, a line width extracting unit for reading the image paper sheet for correcting and color-by-color extracting a state of toner scattering around edge portions of the line image. Color-by-color correcting data is then calculated based on the color-by-color extracted information. A line width correcting unit accomplishes correction based on the calculated result when subsequently forming ordinary images.