Patent ID: 6430321
Filing Date: 2002-08-06
Classification: G06K,G06T,H04N

Abstract:
A method of enhancing data which is rendered as a bi-tonal bit-mapped image for subsequent printing on a printer, the method comprising the steps of:receiving a source bit-mapped image at a first resolution for printing on a printer at a second resolution which is higher than the first resolution, wherein the source bit-mapped image has a plurality of elements, prior to expansion of each element of the source bit-mapped image, convoluting the source bit-mapped image with a gradient operator to generate at least one gradient value for each element of the source bit-mapped image, expanding each element of the source bit-mapped image by a predetermined factor to produce an expanded bit-mapped image at the second resolution for sending to the printer, and assigning a value to each element in the expanded bit-mapped image dependent on the value of associated elements in the source bit-mapped image and the associated at least one gradient value.