Television – Bandwidth reduction system – Data rate reduction
Patent
1994-04-26
1997-09-09
Britton, Howard W.
Television
Bandwidth reduction system
Data rate reduction
358403, 358439, H04N 730
Patent
active
056661614
ABSTRACT:
Compressed image data of a desired picture is read out from a memory having compressed image data of a sequential format stored therein and then subjected to an examination with respect to a plurality of frequency components of the read-out compressed image data. Part of the plurality of frequency components is deleted to obtain compressed image data of a quality lower than an original quality of the compressed image data. The obtained compressed image data of the lower quality is decoded and displayed on a display. The plurality of frequency components are deleted in a stepwise manner according to a traffic state of a transmission line through which the compressed image data is to be transmitted. For maintaining a picture frame rate to be constant, the plurality of frequency components may be deleted in a stepwise manner. For obtaining a desired decoding rate, the plurality of frequency components may be deleted in a stepwise manner.
REFERENCES:
patent: 4734767 (1988-03-01), Kaneko
patent: 5073821 (1991-12-01), Juri
patent: 5272543 (1993-12-01), Yanagisawa
patent: 5416602 (1995-05-01), Inga
Kamo Munekazu
Kawahara Tetsuya
Kohiyama Tomohisa
Nakata Junji
Tomita Taminori
Britton Howard W.
Hitachi , Ltd.
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