Method and apparatus for halftoning and inverse halftoning and the transmission of such images
April 9, 2012. 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 References 3085878 Method and arrangement for eliminating flicker in interlaced ordered dither images Electronic half-tone generating means for facsimile reproduction system Method and apparatus for producing a facsimile gray scale Method and apparatus for making monochrome facsimiles of color images on color displays Tool grind fixture Arrangement for providing a flickerless ordered dither image for a video display Display of pseudo-gray scale picture signals on multilevel displays Method and equipment for processing gray scale facsimile signal Method and apparatus for the representation of gray scale values in facsimile transmission InventorsAssigneeApplicationNo. 866049 filed on 04/09/1992US Classes:358/3.08Descreening (e.g., inverse halftone conversion)ExaminersPrimary: Brinich, StephenAttorney, Agent or FirmForeign Patent References
International 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. A method for obtaining the inverse halftone or gray scale image of a halftone image is also disclosed in which the halftone image can be comprised of clustered dots or dispersed dots, and it is not necessary to have knowledge of the screening methods or parameter. A method for transmitting and receiving a gray scale image in a compressed and decompressed manner, respectively, is disclosed for efficient facsimile transmission of images.Other References
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