Patent ID: 6334001
Filing Date: 2001-12-25
Classification: G06T,H04N

Abstract:
A method of processing mixed raster content planes which represent a compressed pixel map representation of a document, wherein the mixed raster content planes include an upper plane, a lower plane, and a selector plane, and wherein the upper and lower planes have been processed based upon data contained in said selector plane, comprising the steps of:a) generating an image plane map which identifies locations on an associated image data plane of image data signals that shall be used to reconstruct said digital image;b) replacing all image data signals that correspond to locations not identified for image reconstruction using an iterative smoothing technique; andc) outputting said image plane;wherein for said image data signal replacing steps, said iterative smoothing technique comprises the steps of:1) replacing each image data signal on said image plane that does not correspond to said reconstruction identified locations with a signal equal to an average of all image data neighbor signals that correspond to locations previously identified for reconstruction, wherein a neighbor signal is defined as an image data signal that is horizontally, vertically or diagonally adjacent to said image data signal;2) applying a discrete cosine transformation to said image plane and quantizing the results of said transformation;3) inverse quantizing said transformation results and performing an inverse discrete cosine transform thereon, thereby generating a pseudo-plane that has image data signals that lie in the same locations as signals in said image data plane; and4) replacing each image data signal on said image data plane that does not correspond to a reconstruction identified location on said image data plane map with an image data signal on said pseudo-plane that lies in a same location.