System for encoding or decoding analog video signals

An encoder/decoder for video signals is especially designed for truer conversion of half-tone signals. An image scanner produces analog signals which are converted to digital signals and buffer stored for eliminating timing differences. Then, the signals are preprocessed to increase the run-length o...

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Bibliographic Details
Main Author OHTANI; NOBUHIRO
Format Patent
LanguageEnglish
Published 17.04.1990
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:An encoder/decoder for video signals is especially designed for truer conversion of half-tone signals. An image scanner produces analog signals which are converted to digital signals and buffer stored for eliminating timing differences. Then, the signals are preprocessed to increase the run-length of the digital video signals. The signals are monitored both before and after the preprocessing. A comparison of these monitored signals leads to a selection of the one signal before or after preprocessing which appears to be the best. That selected signal has a tag inserted to demark it from the next succeeding signal and to indicate whether the preprocessing was or was not included in the transmitted signal. The tag signal is used to include or exclude a post processing in order to undo the encoding.
Bibliography:Application Number: US19880225538