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:
Oct. 02, 1984
Filed:
Feb. 23, 1982
Kazumoto Iinuma, Tokyo, JP;
Nippon Electric Co., Ltd., Tokyo, JP;
Abstract
In an encoder responsive to a video signal variable between high and low levels, a logic converter logically converts a succession of result signals, derived from the video signal by the use of a predetermined number of halftone threshold levels, into a sequence of converted signals having that run length of logic '0' or '1' level which is longer than that in the result signal succession. The converter may comprise a combination of adders and memory elements to process the consecutive result signals. The converted signal sequence is encoded by an encoding circuit into a data-compression digitized signal. In a decoder for decoding the digitized signal into a reproduction of the result signal succession, a logic inverter comprises a combination of adders and memory elements, similar to that of the converter. The inverter processes, into the reproduction, signals derived from data-expansion decoding of the digitized signal. Preferably, a dither matrix is used to provide the threshold levels.