IMAGE PROCESSING APPARATUS AND IMAGE PROCESSING METHOD

摘要

In response to a reading start instruction, a second size detection processing portion detects a predetermined maximum sheet size for which reading can be performed by an image reading portion, among sheet sizes having the same size in a main scanning direction as that of a document sheet indicated by an output signal from a document sheet width sensor. A first blank sheet determination processing portion sets a first determination region corresponding to the sheet size, and a control portion causes the image reading portion to perform a reading operation. If image information of the first determination region is obtained, the first blank sheet determination processing portion determines whether a document sheet image is a blank sheet image, based on the image information. If the document sheet image is a blank sheet image, a first image processing portion deletes image information of the document sheet image.

主权项

1. An image processing apparatus comprising:
a document sheet conveyance portion configured to sequentially convey a plurality of document sheets placed on a document sheet placement portion; an image reading portion configured to read image information from each document sheet conveyed by the document sheet conveyance portion; a mixed size reading control portion configured to perform mixed size reading processing of causing the image reading portion to read image information corresponding to a length in a secondary scanning direction of a predetermined maximum sheet size, from each document sheet placed on the document sheet placement portion; a first size detection portion configured to detect a size of the document sheet based on the image information from the document sheet conveyed by the document sheet conveyance portion read by the image reading portion; a first blank sheet determination processing portion configured to, in the case where the mixed size reading processing is executed by the mixed size reading control portion, determine whether the document sheet image is a blank sheet image, based on image information of a first determination region previously set according to a document sheet with the maximum sheet size, before the size of the document sheet is detected by the first size detection portion; and a first image processing portion configured to, if the first blank sheet determination processing portion determines that the document sheet image is a blank sheet image, delete image information of the document sheet image.