| 摘要 |
A storage medium has recorded thereon a packetized digitally encoded image representative signal for forward and reverse direction reproduction. The digitally encoded signal comprises a plurality of groups of pictures, a group of the plurality of groups including at least an intra coded picture and a predicted picture. The intra coded picture type and the predicted picture type each comprise top and bottom fields. The predicted picture type has a first motion vector for decoding in the forward direction, and has a second motion vector for decoding in the reverse direction. In a further inventive arrangement a storage medium has recorded thereon a packetized digitally encoded image representative signal for forward and reverse direction reproduction. The digitally encoded signal comprises a plurality of groups of pictures, a group of said plurality of groups including at least an intra coded picture and a predicted picture. The intra coded picture and the predicted picture comprise a top field and a bottom field. The digitally encoded signal comprises. A motion vector for constructing the predicted picture from a predetermined only one of the top and bottom fields.
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