Patent ID: 7876475
Filing Date: 2011-01-25
Classification: B41J,G03G,G06F,G06K,H04N

Abstract:
1. A printer controller for operatively controlling a pagewidth printhead, said controller comprising: an interface for receiving an image having a bi-level black data layer compressed in an Edge Delta and Runlength (EDRL) compression format and a continuous tone (contone) CMYK data layer; an EDRL expander and a Joint Photographic Experts Group (JPEG) decoder unit for expanding the image by simultaneously decompressing the two data layers in parallel; a halftoner and compositor unit for halftoning the contone CMYK data layer into bi-level CMYK data layer and compositing the bi-level black data layer over the bi-level CMYK data layer to form a composited bi-level CMYK image; a processor and memory arrangement configured to control the interface, the expander and decoder unit, and the halftoner and compositor unit, and further configured to transmit the composited bi-level CMYK image to a memory buffer of the pagewidth printhead via a printhead interface.