| 摘要 |
Motion-compensated hybrid codecs are used in data compression for moving picture sequences. By virtue of the regular insertion of intraframe-coded pictures, these compression methods enable access to any desired individual pictures in the entire bit stream or the playback of the bit stream from virtually any desired location. A disadvantage is the high bit outlay necessary for intraframe-coded pictures. In a feedback loop, a codec usually contains a simulation of the receiver-end decoder, whose coding errors can thus also be taken into account by the encoder. According to the invention, an attenuation element is inserted into this feedback loop. The coding and the receiver-end decoding of intraframe-coded pictures becomes superfluous. After the receiver-end decoding of a few pictures, beginning with a grey-scale picture as starting picture, a viewer does not perceive a difference between picture sequences which are coded in a known manner, and contain I pictures at relatively short intervals, and picture sequences which are coded according to the invention.
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