Patent ID: 7215444
Filing Date: 2007-05-08
Classification: H04N

Abstract:
1. A method for designing a halftone screen having a square zero-shift halftone supercell, comprising: selecting a desired angle between a first frame of reference and a second frame of reference; selecting a desired length for a first side of a pair of sides of a non-square supercell in the first frame of reference; determining, from the desired angle and the desired length of the first side, a value for a nominal side length for a second side of the pair of sides of the non-square supercell in the first frame of reference, the determined nominal side length being a calculated initial determination of the length of the second side of the pair of sides; selecting an actual side length for the second side based on the determined nominal side length of the second side such that a number of centers within the square zero-shift halftone supercell is an integer; and determining an integer number of centers within the square zero-shift halftone supercell based on the side lengths of the first and second sides of the non-square supercell.