Patent ID: 7835445

Claim:
A method of decoding a current field block by selecting a reference field picture by a moving picture decoder, comprising: obtaining, by the moving picture decoder, a reference frame picture list of multiple reference frame pictures information; determining, by the moving picture decoder, a reference frame picture index based on display order information for the multiple reference frame pictures, the reference frame picture index being allocated to reference frames having a greater display order than that of a picture including the current field block in the display order, and the rest of the reference frame picture index being allocated to reference frames having a less display order than that of the picture including the current field block in reverse order of the display order; reordering, by the moving picture decoder, a reference frame picture index allocated to each reference frame picture in the reference frame picture list; obtaining, by the moving picture decoder, a reference field picture index representing a reference field picture associated with the current field block; determining, by the moving picture decoder, 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, by the moving picture decoder, 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, by the moving picture decoder, the current field block by referring to the selected reference field picture.