Digital halftoning space filling curves
November 7, 2014. 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 ReferencesScreened image reproduction Production of screen printing blocks Method and arrangement for the representation of a halftone image by use of a detection-adapted grid Anti-aliasing of raster images using assumed boundary lines Scanning techniques using hierarchical set of curves Image halftoning system for printers Color image printing apparatus Image halftone generation by static RAM look-up table Error diffusion of subcells in digital halftoning Halftone image printing device InventorsApplicationNo. 335549 filed on 11/07/1994US Classes:382/266, Edge or contour enhancement358/3.06, Halftoning (e.g., a pattern of print elements used to represent a gray level)358/536, Halftone screening382/316Curve tracerExaminersPrimary: Coles, Sr., Edward L.Assistant: Williams, Kimberly Attorney, Agent or FirmInternational ClassesH04N 001/40H04N 001/41 AbstractA digital halftoning method for creating a gray-scale monochrome reproduction of a source image includes subdividing the source image into regions based on a trace of the space filing curve, further subdividing each of the regions into equally sized pixels, scanning the source image along the trace of the space filling curve to visit all pixels of the source image, calculating an average image intensity for each region, establishing a range of pixel cluster intensity levels based on a number of pixels in a cluster, and generating a dot pattern for each of the pixel clusters by activating individual ones of the pixels to an 0N state in accordance with a sequential order along the trace of the space filling curve. | |
