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:
Nov. 29, 1977
Filed:
Oct. 21, 1976
Frank William Mounts, Colts Neck, NJ (US);
Arun Narayan Netravali, Matawan, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
A facsimile scene typically includes a plurality of lines, each line having a plurality of picture elements (pels). Often, pel signals are adaptable for run-length coding, a run being one or more successive pels having the same brightness level. To increase the length of a run and hence to permit more efficient use of a transmission link between transmitter and receiver, a processor arrangement is disclosed for permuting a measure of the pel signals responsive to a reference signal. The reference signal is a calibration signal. The measure is an error signal for indicating a difference between the current pel signal and a prediction thereof. In an illustrative bi-level facsimile system embodiment, if the calibration signal is a logic one, the error signal is loaded beginning at one end of a memory; if the calibration pel signal is a logic zero, the error signal is loaded beginning at the other end of the memory. The loaded permuted error signal having an increased run length is then sequentially read from one end of the memory for extension to a state of the art run-length coder.