The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 22, 1980
Filed:
Jul. 20, 1978
Frank W Mounts, Colts Neck, NJ (US);
Arun N Netravali, Matawan, NJ (US);
Kenneth A Walsh, Atlantic Highlands, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
A facsimile signal encoding technique reduces the amount of information needed to represent a picture by (a) generating an error signal (on line 1120) which indicates whether an intensity value prediction corresponds to the true intensity value, (b) generating a reference signal (on line 1005) indicating whether the confidence in each prediction is high or low, (c) reordering the error signal values (logic 1010) into high and low confidence groups in accordance with the reference signal, and (d) assigning code words (encoder 1016) to represent the run lengths of the reordered data. Advantageously, different code dictionaries are selected (line 1019) for code assignment in each of the groups, each dictionary being tailored to the type of runs expected in each group. Also, code words for certain runs may be dropped, and the lengths of other runs may be combined (by logic 1015) before run length coding, again increasing encoder efficiency. A receiver (FIGS. 16-18) for decoding the run lengths is described.