Patent ID: 8451899

Claim:
A method for decoding a video signal, the method comprising: determining, by a tangible decoding apparatus, a type of a macroblock of a field macroblock pair in a MacroBlock Adaptive Frame Field frame (MBAFF frame) in a base layer, the macroblock pair including two vertically adjacent macroblocks, the type indicating an intra-mode macroblock or an inter-mode macroblock; if it is determined that only one of the macroblocks is the intra mode macroblock, setting, by the tangible decoding apparatus, motion information of the intra-mode macroblock using motion information of the inter-mode macroblock; and deriving, by the tangible decoding apparatus, motion information of a frame macroblock pair of vertically adjacent macroblocks in an enhanced layer for interlayer motion prediction based on the two vertically adjacent macroblocks of the base layer, wherein the MacroBlock Adaptive Frame Field frame (MBAFF frame) is a frame including macroblocks adaptively decoded as a frame macroblock and a field macroblock, wherein the motion information includes a motion vector, and a vertical component of the motion vector of the frame macroblock pair in the enhanced layer is predicted by multiplying a vertical component of the motion vector of the field macroblock pair by two.