Dither volume with three thresholds for each cell location
First Claim
1. A method of dithering a dither volume, for digital halftoning a contone image, in the form of an array of contone color pixel values, to bi-level dots, comprising the steps of:
- assigning for each dither cell location a fixed set of 3 thresholds defining 4 intensity intervals within which said dither cell location is defined to an alternative not set and set.
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Accused Products
Abstract
While a general large layer dither volume provides great flexibility in dither cell design, by decoupling different intensity levels, they are inefficient to access since each colour component requires the retrieval of a different bit from the volume. Therefore in a multi threshold dither volume for digital halftoning a contone colour image, in the form of an array of contone colour pixel values to bi-level dots, there is allocated for each dither cell location a fix set of n thresholds defining n+1 intensity intervals within which said dither cell location is defined to be alternatively not set and set.
19 Citations
5 Claims
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1. A method of dithering a dither volume, for digital halftoning a contone image, in the form of an array of contone color pixel values, to bi-level dots, comprising the steps of:
assigning for each dither cell location a fixed set of 3 thresholds defining 4 intensity intervals within which said dither cell location is defined to an alternative not set and set. - View Dependent Claims (2, 3, 4, 5)
Specification