Patent ID: 8457201

Claim:
A method for decoding an image signal comprising: deriving, by a tangible decoding apparatus, virtual position information of a corresponding field macroblock pair, the corresponding field macroblock pair corresponding to a field macroblock pair of an enhanced layer; deriving, by the tangible decoding apparatus, position information of a reference frame macroblock pair based on the virtual position information of the corresponding macroblock pair, the reference frame macroblock pair being in a base layer; predicting, by the tangible decoding apparatus, motion information of the field macroblock pair of the enhanced layer from motion information of the reference frame macroblock pair according to the position information of the reference frame macroblock pair; and decoding, by the tangible decoding apparatus, the field macroblock pair of the enhanced layer by using the motion information of the field macroblock pair of the enhanced layer, wherein the motion information of the field macroblock pair and the reference frame macroblock pair includes a reference index and a motion vector, the field macroblock pair is two vertically adjacent field macroblocks, and the reference frame macroblock pair is two vertically adjacent frame macroblocks, wherein the motion vector of the field macroblock pair is predicted as zero when the field macroblock pair is predicted based on an intra-coded macroblock.