Adaptive halftone scheme to preserve image smoothness and sharpness by utilizing X-label
First Claim
1. An adaptive halftoning method for use on a digital representation of a compound document, comprising the steps of:
- identifying regions in the digital representation, each identified region being classified as either a first region or a second region; and
processing each identified region as follows;
wherever a first region is adjacent to a second region, creating a transition region in a portion of that first region bordering that second region and apply a blend of a first halftone technique and a third halftone technique to that transition region, applying the first halftone technique to the remainder of that first region, and applying a second halftone technique to that second region, and applying the first halftone technique to each remaining first region and applying the second halftone technique to each remaining second region.
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Accused Products
Abstract
An adaptive halftone scheme is applied to a compound document to smooth the rendering while preserving edge sharpness. The adaptive halftone scheme involves identifying document regions as either smooth, edge or texture. Each identified region is then processed as follows. Wherever a smooth region is adjacent to an edge region and wherever a smooth region is adjacent to a texture region, create a transition region in a portion of that smooth region bordering that other region and apply a blend of a screening halftone technique (SCN) and an error diffusion with screening halftone technique (EDSCN) to that transition region, apply SCN to the remainder of that smooth region, apply ED to that other region if it is an edge region, and apply either EDSCN or SCN if it is texture region.
25 Citations
25 Claims
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1. An adaptive halftoning method for use on a digital representation of a compound document, comprising the steps of:
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identifying regions in the digital representation, each identified region being classified as either a first region or a second region; and
processing each identified region as follows;
wherever a first region is adjacent to a second region, creating a transition region in a portion of that first region bordering that second region and apply a blend of a first halftone technique and a third halftone technique to that transition region, applying the first halftone technique to the remainder of that first region, and applying a second halftone technique to that second region, and applying the first halftone technique to each remaining first region and applying the second halftone technique to each remaining second region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for performing an adaptive halftoning scheme on a digital representation of a compound document, the apparatus comprising:
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a region-identifying module configured to identify regions in the digital representation, each identified region being classified as either a first region or a second region; and
a module configured to process each identified region as follows;
wherever a first region is adjacent to a second region, create a transition region in a portion of that first region bordering that second region and apply a blend of a first halftone technique and a third halftone technique to that transition region, apply the first halftone technique to the remainder of that first region, and apply a second halftone technique to that second region, and apply the first halftone technique to each remaining first region and apply the second halftone technique to each remaining second region. - View Dependent Claims (13, 14)
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15. A machine-readable medium having a program of instructions for directing a machine to perform an adaptive halftoning method on a digital representation of a compound document, the program of instructions comprising:
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instructions for identifying regions in the digital representation, each identified region being classified as either a first region or a second region; and
instructions for processing each identified region as follows;
wherever a first region is adjacent to a second region, creating a transition region in a portion of that first region bordering that second region and apply a blend of a first halftone technique and a third halftone technique to that transition region, applying the first halftone technique to the remainder of that first region, and applying a second halftone technique to that second region, and applying the first halftone technique to each remaining first region and applying the second halftone technique to each remaining second region. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification