Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1983-12-07
1986-02-04
Groody, James J.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358261, 358263, H04N 1415
Patent
active
045689830
ABSTRACT:
Scanned image data is assembled to represent scanned strips of a document each strip comprising a plurality of scanned lines. The lines of each strip are read in parallel to form data words defining columns of the scanned strips. The data words are encoded by means of Huffman and run-length coding to generate fixed-length coded words which are concatenated to represent the document. Each strip of coded words is reviewed and uncoded data is substituted for coded data in the event the coded data exceeds the uncoded data. Text data and continuous tone data are encoded using different encoding techniques due to their varying characteristics. Synchronization words are used to prefix all coded data strips; to prefix and suffix all uncoded data strips; to define all white and all black strips; and, to indicate changes in data type, i.e., text to continuous tone or vice versa. At least the first and the last data word of each encoded strip are defined as text so that decoding can commence using text decoding techniques. The utilization of fixed-length coded words, the forced definition of at least the first and last data word of each strip as text, and the synchronization code words permit bidirectional decoding of encoded data blocks.
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Groody James J.
Peng John K.
The Mead Corporation
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