CPC Subgroup
H04N 1/40 Picture signal circuits (H04N1/387 takes precedence)
Full Title
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof > Picture signal circuits (H04N1/387 takes precedence)
15 direct subcodes
Child Classifications
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- H04N 1/401 Compensating positionally unequal response of the pick-up or reproducing head (H04N1/403 takes precedence)
- H04N 1/403 Discrimination between the two tones in the picture signal of a two-tone original
- H04N 1/405 Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
- H04N 1/407 Control or modification of tonal gradation or of extreme levels, e.g. background level
- H04N 1/409 Edge or detail enhancement; Noise or error suppression