When scanning a book, although it is easier to scan both the left and right pages (i.e. a so-called 'dual page') at the same time, recognition quality is higher if, after scanning, the page is split into two, with each page corresponding to a single book page. Recognition and layout analysis are then performed separately for each page, along with de-skewing if required.
To split a dual page:
Consequently, each dual page will be split into two batch pages. See General Information on Working with Batches for more information on batches.
Note: If a dual page has been split incorrectly, clear the Split dual pages checkbox, scan the dual page again, or re-add the respective image to the batch and try to split the image manually using the Split image dialog (Image>Split image).