6. The image reading apparatus according to claim 1 , wherein the image compressor determines the compression ratio to be a first compression ratio when the type of the document is the business card, determines the compression ratio to be a second compression ratio which is higher than the first compression ratio when the type of the document is the receipt, and determines the compression ratio to be a third compression ratio which is higher than the second compression ratio when the type of the document is the plastic card.
1. An image reading apparatus comprising: an image generator for generating an input image by reading a document; a document-type identification module for identifying at least, a business card, a receipt, and a plastic card as a type of the document; and an image compressor for compressing the input image, wherein the image compressor determines a compression ratio for compressing the input image, based on the type of the document.