If |HB-VB| ≤ 80 Then  best_INTER_mode = P16×16 Else If HB−VB > 80 Then  best_INTER_mode = P16×8  // (macroblock is divided into two 16×8 partitions) Else If VB−HB > 80 Then  best_INTER_mode = P8×16  // (macroblock is divided into two 8×16 partitions)

Algorithm 1: Algorithm used to define the partition size.