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US 6,486,902 B1Granted
Two-color thermal printing process
AssigneeAxiohm Transaction Solutions, Inc.
InventorSteven Spano
Life of this patent
Estimating the term…
Abstract
A method for improving the image quality of a thermal print image uses preprocessed image and color matrices, in which special combinations of black dots and black dot patterns are filtered out. These patterns are then replaced with printer-friendly patterns. This altering technique improves the image quality and reduces halo effects.
Claims6
A method of improving an image in two color thermal printing, comprising the steps of:
- (a) filtering from said two color image, in maximum cell areas of 4×2 certain ones of dot patterns, wherein said 4×2 cell areas are formed by horizontally copying a 4×1 cell into an adjacent neighbor;
- and then
- (b) replacing said filtered dot patterns of step (a) with printer-friendly patterns, in said two color image.
A method for reducing halo effects in an image created in two-color thermal printing, comprising the steps of:
- a) filtering from a two-color image, in maximum cell areas of 4×2, certain ones of dot patterns, wherein said 4×2 cell areas are formed by horizontally copying a 4×1 cell into an adjacent neighbor;
- and then
- b) replacing said filtered dot patterns of step (a) with printer-friendly patterns, in said two-color image.
Dependencies are inferred from the claim text.