Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-01-27
1994-03-01
Brinich, Stephen
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358456, H04N 140
Patent
active
052913090
ABSTRACT:
An image processing apparatus for outputting an image which contains different kinds of multi-level signals for letters, figures, photographs, screened-halftone, etc. The apparatus comprises a screened-halftone pattern detecting circuit and a continuous-tone pattern detecting circuit for detecting a screened-halftone pattern and a continuous-tone pattern, respectively, by using neighboring pixels of the target pixel, counters for counting UP/DOWN in accordance with the outputs of the detecting circuits, a filter for switching the filtering coefficients of the image signal in multiple stages in accordance with the outputs of the counters and a quantizer for bi-level-quantizing the output of the filter. It is thus possible to produce an image having a good quality free from deterioration due to the rapid switching of region judgements and bi-level-quantizing methods.
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"Bilevel Rendition Method for Documents Including Gray-Scale and Bilevel Image," Journal of The Institute of Electronics, Information and Communication Engineers, vol. J67-BN.7, pp. 781-788, Jul., 1984.
Brinich Stephen
Mitsubishi Denki & Kabushiki Kaisha
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