DIFF Subgroup
H04N 1/407 Control or modification of tonal gradation or of extreme levels, e.g. background level
Introduced: January 1995
Full Title
Full titles differ between systems:
IPC:
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof > Picture signal circuits > Control or modification of tonal gradation or of extreme levels, e.g. background level
CPC:
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof > Picture signal circuits (H04N1/387 takes precedence) > Control or modification of tonal gradation or of extreme levels, e.g. background level
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.
Child Classifications
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