Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1995-07-25
1997-08-26
Rogers, Scott A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358465, 358466, H04N 1405
Patent
active
056615701
ABSTRACT:
An apparatus for processing multilevel image data representing a half-tone image, into bilevel image data representing a bilevel image corresponding to the half-tone image, the multilevel image data including sets of multilevel pixel data each set of which represents one of three or more color values as a first color value indicating a color of a corresponding one of pixels of the half-tone image, and is processed into a corresponding one of sets of bilevel pixel data of the bilevel image data so that the corresponding one set of bilevel pixel data represents one of two color values as a second color value indicating a color of a corresponding one of pixels of the bilevel image, the apparatus including a data processing device for processing each set of multilevel pixel data into a corresponding one set of bilevel pixel data, by an error diffusion process wherein an error value occurring in processing each set of multilevel pixel data into a corresponding one set of bilevel pixel data is distributed to one or more first pixels which neighbor the corresponding one pixel of the half-tone image and correspond to one or more sets of multilevel pixel data yet to be processed, the processing device processing each set of multilevel pixel data into a corresponding one set of bilevel pixel data, by employing a threshold value which is variable depending upon the each set of multilevel pixel data.
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"An Adaptive Algorithm for Spatial Grey Scale" (Floyd et al.), SID 75 Digest, Stanford University, Stanford, CA.
"A Survey of Techniques for the Display of Continuous Tone Pictures on Bilevel Displays", (Jarvis et al.), Computer Graphics and Image Processing 5 (1976), pp. 13-40.
Brother Kogyo Kabushiki Kaisha
Rogers Scott A.
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