Image reading apparatus, image forming apparatus and document area detecting method

摘要

Problem to be solved: to provide an image reading apparatus, an image forming apparatus, and a document area detecting method capable of suppressing the increase in the processing load of the apparatus and improving the detection accuracy of a plurality of document areas included in the image data.Image forming apparatusOf the second image data including the first image data including the image of the first side of the original placed on the document placing portion and the image of the second side of the documentA fifth detection processing unit 57 for detecting a second line image having a width smaller than a second threshold value which is smaller than the first threshold value from the rectangular region included in the third image data in which the width of the rectangular region partitioned by a first line image whose width is greater than the first threshold value is small isA sixth detection processing unit 58 for detecting the rectangular region included in the fourth image data of the number of large numbers and the rectangular region corresponding to the rectangular region in the third image data or the divided region divided by the second line image as the document area on both sides of the document, and.Diagram