Television receiver with teletext receiving function and method of superimposing teletext picture on television picture
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 16, 1991
Grant Date -
N/A
app pub date -
Feb 28, 1990
filing date -
Feb 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In case teletext data superimposed on a television broadcast signal are to be displayed as an auxiliary picture on a main picture on which a television video signal is displayed, the teletext data must be compressed. If the logical outputs of two pixels themselves adjacent in the horizontal direction are made data after the compression as this compressing method, depending on the contents of the teletext data, the data after the compression will not reproduce the original information in some case. In this invention, the teletext data are divided into blocks of a predetermined size and the 'dense' and 'rare' densities of the respective blocks are judged. The optimum compressing method losing no information is selected in response to this judging result.
First Claim
Family
International Classification(s)
Cited Art Landscape
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