Image flow through a digital copier involves a sequence of transformations, from the document original, to a scanned numerical representation, to a processed bitmap, to an exposure map, to a developed, then transferred, and then fused image. Technologies and architecture need to be selected to optimize copy quality, but there are many constraints, such as cost, reliability and productivity, that enter into the selection decision. In this paper we describe the rationale and benefits of the architecture and technologies behind the Xerox Nuvera Production Printing System and Xerox FreeFlow Scanner 665 and image processor. Nuvera print quality is superb due to its xerographic design; however, in this paper we focus on copy quality and the interplay between xerographic and copier image processing design. The key enablers to outstanding copy quality are the 600 spi scan resolution, segmentation and auto-windowing image processing, and a xerographic module that produces high resolution, consistent, uniform, and low-noise images. The system reflects a technology evolution in which different image processing rendering techniques are applied uniquely to each object within a single page so as to take full advantage of the superior xerographic engine.
Raymond Clark, David Craig, "Xerox Nuvera Technology for Image Quality" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP21), 2005, pp 671 - 674, https://doi.org/10.2352/ISSN.2169-4451.2005.21.1.art00087_2