Patent ID: 6763144
Filing Date: 2004-07-13
Classification: H04N

Abstract:
A method for producing halftone images, which comprises the steps of:providing pairs of image coordinates defining addresses in a digital image or a part thereof; deriving a screen reference value from each said coordinate pair; providing the image intensity values of said digital image corresponding to said addresses; and deriving a halftone value from each pair of image intensity value and the corresponding screen reference value, wherein said halftone value is predefined for each said pair of image intensity value and corresponding screen reference value, wherein said step of deriving a screen reference value comprises using a first transformation module to receive the coordinate pairs and derive from each said coordinate pair a screen reference value, and wherein said step of deriving a halftone value comprises using a second transformation module to receive said screen reference values and said image intensity values and derive a halftone value therefrom, and wherein said second transformation module is a two-dimensional matrix.