Method and apparatus for forming 3x3 pixel arrays and for performing programmable pattern contingent modifications of those arrays

摘要

An apparatus for defining a bank of a sequential windows (86,88) from a raster-scanned image of a document - (72) for storage in a data base includes a look-up table for each window (86,88) wherein the bit pattern of the window - (86) is used to determine the correction factor which is applied to the next window(88) as the "new" bit from a set of patterns and correction factors derived from well known algorithms developed to minimize the amount of data needed to electronically recreate a given document (72). The apparatus also includes storage devices to permit the application of the algorithm in overlapping pieces over the face of the document (72).