Various embodiments herein each include at least one of systems, methods, data structures, and software for document image processing within a device such as a retail scanner. One such embodiment, in the form of a method, includes receiving a document image from an imaging device of a scanner and determining a type of the document represented in the document image. The document image may then be processed to obtain document metadata and the document image and metadata representative of the document metadata and document type are added to a data structure. This method may further include adding transaction-related metadata to the data structure. The data structure may then be stored on the scanner, transmitted via local communications link to a host device, transmitted via a network to a database for storage, or transmitted via a network to another system for one or both of processing and storage.