Constraints on neighboring block based disparity vector (nbdv) techniques for 3d video

A method for encoding video data, the method comprising:

• determining a location of a co-located largest coding unit (CLCU) in a candidate reference picture, wherein the CLCU is co-located with a largest coding unit (LCU) that covers a current block in a current picture of the video data;
• determining whether a block in the candidate reference picture is available based on a location of the block in the candidate reference picture relative to a location of the CLCU within the candidate reference picture;
• if the block in the candidate reference picture is available, determining whether the block in the candidate reference picture is inter-predicted with a disparity motion vector, wherein the disparity motion vector refers to a reference picture used to inter-predict the block in the candidate reference picture and is in a view other than a view that includes the candidate reference picture;
• if the block in the candidate reference picture is inter-predicted with the disparity motion vector, deriving a disparity vector for the current block from the disparity motion vector;
• and
• inter-prediction encoding the current block based in part on the disparity vector.

A device comprising a video coder, the video coder configured to:

• determine a location of a co-located largest coding unit (CLCU) in a candidate reference picture, wherein the CLCU is co-located with a largest coding unit (LCU) that covers a current block in a current picture;
• determine whether a block in the candidate reference picture is available based on a location of the block in the candidate reference picture relative to a location of the CLCU within the candidate reference picture;
• if the block in the candidate reference picture is available, determine whether the block in the candidate reference picture is inter-predicted with a disparity motion vector, wherein the disparity motion vector refers to a reference picture used to inter-predict the block in the candidate reference picture and is in a view other than a view that includes the candidate reference picture;
• if the block in the candidate reference picture is inter-predicted with the disparity motion vector, derive a disparity vector for the current block from the disparity motion vector;
• and
• inter-prediction code the current block based in part on the disparity vector.

A device for coding video data, the device comprising:

• means for determining a location of a co-located largest coding unit (CLCU) in a candidate reference picture, wherein the CLCU is co-located with a largest coding unit (LCU) that covers a current block in a current picture of the video data;
• means for determining whether a block in the candidate reference picture is available based on a location of the block in the candidate reference picture relative to a location of the CLCU within the candidate reference picture;
• means for determining whether the block in the candidate reference picture is inter-predicted with a disparity motion vector if the block in the candidate reference picture is available, wherein the disparity motion vector refers to a reference picture used to inter-predict the block in the candidate reference picture and is in a view other than a view that includes the candidate reference picture;
• means for deriving a disparity vector for the current block from the disparity motion vector if the block in the candidate reference picture is inter-predicted with the disparity motion vector;
• and
• means for inter-prediction coding the current block based in part on the disparity vector.

A computer-readable storage medium having instructions stored thereon that when executed by one or more processors of a device for coding video data cause the one or more processors to:

• determine a location of a co-located largest coding unit (CLCU) in a candidate reference picture, wherein the CLCU is co-located with a largest coding unit (LCU) that covers a current block in a current picture of the video data;
• determine whether a block in the candidate reference picture is available based on a location of the block in the candidate reference picture relative to a location of the CLCU within the candidate reference picture;
• determine whether the block in the candidate reference picture is inter-predicted with a disparity motion vector if the block in the candidate reference picture is available, wherein the disparity motion vector refers to a reference picture used to inter-predict the block in the candidate reference picture and is in a view other than a view that includes the candidate reference picture;
• derive a disparity vector for the current block from the disparity motion vector if the block in the candidate reference picture is inter-predicted with the disparity motion vector;
• and
• inter-prediction code the current block based in part on the disparity vector.