1. A method for processing a video signal by a video decoder, comprising: acquiring a second inter-view motion vector from a neighboring block of a current texture block; acquiring a depth block corresponding to the current texture block using the acquired second inter-view motion vector, the depth block being indicated by the acquired second inter-view motion vector and being located in a neighboring view of the current texture block; deriving a first inter-view motion vector from a maximum depth value of a left upper corner pixel, a left lower corner pixel, a right upper corner pixel, and a right lower corner pixel in the acquired depth block; and decoding the current texture block using the derived first inter-view motion vector.