The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 1993
Filed:
Oct. 13, 1992
Richard W Bunce, Boise, ID (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A method for enhancing reproduction of pixel images includes the steps of: storing a raster scan bit map of an image; selecting an input window from the bit map image that includes a plurality of row segments of bits representing pixels, the input window having a center pixel bit; comparing a subset of bits in the input window (that includes the center pixel bit) with a plurality of prediction bit subsets, each prediction subset represented in a plurality of rotation orientations, and upon finding a match with one of the prediction bit subsets, rotating the input window to the degree and direction indicated by a command associated with a matching prediction subset (if any); comparing the rotated input window with a limited set of sample windows to determine a match of certain bit states within the rotated input window with certain bits of a stored sample window; and upon determining that such a match exists, substituting an enhanced pixel representation for the center pixel bit of the input window.