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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H04N1/407
Control or modification of tonal gradation or of extreme levels, e.g. background level
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H04N1/4076
dependent on references outside the picture
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H04N1/4078
using gradational references, e.g. grey-scale test pattern analysis
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