Image processing device

An image processing device comprising:

• a binarizing section that generates binary image data representing a binary image from raster image data representing a raster image;
• a white-pixel ratio determining section that, based on the binary image data,
• determines a white pixel ratio for each of a plurality of lines of the binary image and a position of each of lines having a white pixel ratio equal to or greater than a predetermined first threshold among the plurality of lines of the binary image, and
• determines a white pixel ratio for an entirety of the binary image;
• and
• an image-type determining section that determines an image type of the raster image based on the position of each of the lines having a white pixel ratio equal to or greater than the first threshold and the white pixel ratio of the entirety of the binary image, wherein
• the image-type determining section determines that
• the raster image is a photographic image when the white pixel ratio of the entirety of the binary image is equal to or less than a predetermined second threshold, and
• the raster image includes a text image when the lines having a white pixel ratio equal to or greater than the first threshold appear cyclically in the binary image.