Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04N
PICTORIAL COMMUNICATION, e.g. TELEVISION
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1/00
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
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H04N1/405
Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
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H04N1/4055
producing a clustered dots or a size modulated halftone pattern
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H04N1/4057
the pattern being a mixture of differently sized sub-patterns, e.g. spots having only a few different diameters
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