Sharing of motion vector in 3d video coding

An apparatus for encoding a media stream including a first depth map picture associated with a first texture picture and a second depth map picture associated with a second texture picture, the apparatus configured to:

• predict the second depth map picture from the first depth map picture using a first motion vector;
• predict the second texture picture from the first texture picture using a second motion vector;
• encode the first motion vector into a bitstream;
• predict the first motion vector based at least on the second motion vector represented as a prediction motion vector;
• and
• encode a difference between the first motion vector and the prediction motion vector into the bitstream.

A method of decoding a media stream including a first depth map picture associated with a first texture picture and a second depth map picture associated with a second texture picture, the method comprising:

• decoding a first motion vector from a bitstream;
• decoding a second motion vector by summing a prediction based on the first motion vector and a residual value retrieved from the bitstream;
• decoding the second depth map picture, wherein the first motion vector is used to predict the second depth map picture from the first depth map picture;
• and
• decoding the second texture picture, wherein the second motion vector is used to predict the second texture picture from the first texture picture.

An apparatus for decoding a media stream including a first depth map picture associated with a first texture picture and a second depth map picture associated with a second texture picture, the apparatus configured to:

• decode a first motion vector from a bitstream;
• decode a second motion vector by summing a prediction based on the first motion vector and a residual value retrieved from the bitstream;
• decode the second depth map picture, wherein the first motion vector is used to predict the second depth map picture from the first depth map picture;
• and
• decode the second texture picture, wherein the second motion vector is used to predict the second texture picture from the first texture picture.