| 摘要 |
A digital facsimile system provides band-compression of half-tone picture signals. Primarily, a plurality of analog signals are derived by successively scanning a picture. Thereafter, the analog signals are converted into digital signals and then the digital signals are compressed. Initially, the digital signals are pulse trains of two-level signals, representing the scanned picture, sliced into segments at multi-level quantization levels. Band compression is realized after a plurality of two-level digital pulse trains are compared. Only the differences between corresponding bits, which are found by the comparison, are encoded and transmitted.
|
