Method and apparatus for halftone rendering of a gray scale image using a blue noise mask
December 4, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesSimultaneous transmission of two information signals within a band-limited communications channel Halftone image processing method Method and apparatus for generating pseudo-halftone dots by comparing gray scale values of an original with dither threshold values stored in cells of a matrix array divided into imaginary matrices of elemental areas each containing one cell Apparatus for generating an image from a digital video signal Solid state imaging apparatus with means for controlling signal accumulation period Method for thresholding an image signal Digital halftoning with minimum visual modulation patterns Patent #: 4920501 InventorsAssigneeApplicationNo. 622056 filed on 12/04/1990US Classes:358/3.19Stochastic or random ditheringExaminersPrimary: Brinich, StephenAttorney, Agent or FirmInternational ClassH04N 001/40AbstractA method of and system for rendering a halftone image of a gray scale image by utilizing a pixel-by-pixel comparison of the gray scale image against a blue noise mask is disclosed in which the gray scale image is scanned on a pixel-by-pixel basis and compared on a pixel-by-pixel basis to an array of corresponding data points contained in a blue noise mask stored in a PROM or computer memory in order to produce the desired halftoned image. Both digital and optically implemented halftone methods are disclosed.Other References
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