Method and apparatus for creating less amount of compressd image data from compressed still image data and system for transmitting compressed image data through transmission line
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United States of America Patent
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Sep 9, 1997
Grant Date -
N/A
app pub date -
Apr 26, 1994
filing date -
Apr 26, 1993
priority date (Note) -
In Force
status (Latency Note)
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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.
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