1. An image processing device comprising: an image processing section configured to generate image data for character recognition, page by page from image data of an original document; and a character recognition processing section configured to execute character recognition processing on the image data for character recognition generated by the image processing section, wherein the image processing section generates image data for character recognition for a given page of the original document in accordance with a preset image quality setting, the image processing section determines, according to a processing period for character recognition processing of the image data for character recognition for the given page, whether or not to generate image data for character recognition for a next page subsequent to the given page in accordance with an image quality setting different from the image quality setting set for the given page, and upon determining to generate image data for character recognition for the next page in accordance with an image quality setting different from the image quality setting set for the given page, the image processing section determines the image quality setting for the next page based on at least one of document type and size of the given page and generates image data for character recognition for the next page in accordance with the determined image quality setting.