DIFF Subgroup
H04N 1/4135 Full Title
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof > Bandwidth or redundancy reduction (by scanning H04N1/17 ) > for the transmission or reproduction of two-tone pictures, e.g. black and white pictures > Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information