Method of selecting a reference picture

摘要

The present invention relates to a method of decoding a current field macroblock. The method comprises obtaining a reference frame picture list including multiple reference frame pictures; determining a reference frame picture index of the multiple reference frame pictures in the reference frame picture list based on display order information for the multiple reference frame pictures, the reference frame picture index numbers being allocated in the display order to the reference frame pictures whose display order leads the current field macroblock and the remaining reference frame picture index numbers being allocated in a reverse order to the reference frame pictures whose display order lags behind the current field macroblock; reordering the reference frame picture index allocated to each reference frame picture in the reference frame picture list; obtaining a reference field picture index associated with the current field macroblock; determining a reference frame picture from the reference frame picture list based on the reference field picture index divided by 2 and the reordered reference frame picture index; selecting a reference field picture for the current field block based on the obtained reference field picture index and the determined reference frame picture; and decoding the current field block by referring to the selected reference field picture.