Dc intra mode prediction in video coding

A method of encoding video data, the method comprising:

• determining samples to use for DC intra mode prediction for a current block, wherein determining the samples comprises determining a plurality of samples in at least one of:
• a non-adjacent row of samples having a last sample that is in the same column as a last column of the current block, wherein the non-adjacent row of samples is more than one row above the current block, or
• a non-adjacent column of samples having a last sample that is in the same row as a last row of the current block, wherein the non-adjacent column of samples is more than one column left of the current block;
• and
• encoding the current block using DC intra mode prediction using the determined samples.

A device for decoding video data, the device comprising:

• memory configured to store one or more samples of rows and columns that are non-adjacent to a current block;
• and
• processing circuitry configured to:
• determine samples to use for DC intra mode prediction for a current block, wherein to determine the samples, the processing circuitry is configured to determine a plurality of samples in at least one of:
• a non-adjacent row of samples having a last sample that is in the same column as a last column of the current block, wherein the non-adjacent row of samples is more than one row above the current block, or
• a non-adjacent column of samples having a last sample that is in the same row as a last row of the current block, wherein the non-adjacent column of samples is more than one column left of the current block;
• and
• decode the current block using DC intra mode prediction using the determined samples.

A device for encoding video data, the device comprising:

• memory configured to store one or more samples of rows and columns that are non-adjacent to a current block;
• and
• processing circuitry configured to:
• determine samples to use for DC intra mode prediction for a current block, wherein to determine the samples, the processing circuitry is configured to determine a plurality of samples in at least one of:
• a non-adjacent row of samples having a last sample that is in the same column as a last column of the current block, wherein the non-adjacent row of samples is more than one row above the current block, or
• a non-adjacent column of samples having a last sample that is in the same row as a last row of the current block, wherein the non-adjacent column of samples is more than one column left of the current block;
• and
• encode the current block using DC intra mode prediction using the determined samples.

A computer-readable storage medium storing instructions thereon that when executed cause one or more processors to:

• determine samples to use for DC intra mode prediction for a current block, wherein the instructions that cause the one or more processors to determine the samples comprise instructions that cause the one or more processors to determine a plurality of samples in at least one of:
• a non-adjacent row of samples having a last sample that is in the same column as a last column of the current block, wherein the non-adjacent row of samples is more than one row above the current block, or
• a non-adjacent column of samples having a last sample that is in the same row as a last row of the current block, wherein the non-adjacent column of samples is more than one column left of the current block;
• and
• decode the current block using DC intra mode prediction using the determined samples.

A device for decoding video data, the device comprising:

• means for determining samples to use for DC intra mode prediction for a current block, wherein the means for determining the samples comprises means for determining a plurality of samples in at least one of:
• a non-adjacent row of samples having a last sample that is in the same column as a last column of the current block, wherein the non-adjacent row of samples is more than one row above the current block, or
• a non-adjacent column of samples having a last sample that is in the same row as a last row of the current block, wherein the non-adjacent column of samples is more than one column left of the current block;
• and
• means for decoding the current block using DC intra mode prediction using the determined samples.