Method and apparatus for line buffer reduction for video processing

A method for decoding luma intra mode using context adaptive entropy processing, the method comprising:

• receiving a current syntax element associated with a current luma intra mode of a current block from a bitstream;
• determining whether a neighboring block of the current block within a region of an independently coded slice is on a different side of a boundary of the region from the current block;
• replacing prediction mode information associated with the neighboring block by DC mode if the neighboring block is on the different side of the boundary of the region from the current block;
• forming data for processing the current syntax element based on the prediction mode information associated with the neighboring block;
• and
• performing context adaptive entropy decoding processing on the current syntax element according to the formed data to determine the current luma intra mode,
• wherein the region is a row of largest coding units (LCUs) or a tile.

An apparatus for encoding luma intra mode using context adaptive entropy processing, the apparatus comprising one or more circuits configured to:

• determine a current luma intra mode for a current block;
• determine whether a neighboring block of the current block within a region of an independently coded slice is on a different side of a boundary of the region from the current block;
• replace prediction mode information associated with the neighboring block by DC mode if the neighboring block is on the different side of the boundary of the region from the current block;
• form data for processing a current syntax element associated with the current luma intra mode based on the prediction mode information associated with the neighboring block;
• and
• perform context adaptive entropy encoding processing on the current syntax element according to the formed data,
• wherein the region is a row of largest coding units (LCUs) or a tile.

An apparatus for decoding luma intra mode using context adaptive entropy processing, the apparatus comprising one or more circuits configured to:

• receive a current syntax element associated with a current luma intra mode of a current block from a bitstream;
• determine whether a neighboring block of the current block within a region of an independently coded slice is on a different side of a boundary of the region from the current block;
• replace prediction mode information associated with the neighboring block by DC mode if the neighboring block is on the different side of the boundary of the region from the current block;
• form data for processing the current syntax element based on the prediction mode information associated with the neighboring block;
• and
• perform context adaptive entropy decoding processing on the current syntax element according to the formed data to determine the current luma intra mode,
• wherein the region is a row of largest coding units (LCUs) or a tile.

A non-transitory computer readable medium storing a computer-executable program, the computer-executable program, when executed, causing a decoder to perform the following steps:

• receiving a current syntax element associated with a current luma intra mode of a current block from a bitstream;
• determining whether a neighboring block of the current block within a region of an independently coded slice is on a different side of a boundary of the region from the current block;
• replacing prediction mode information associated with the neighboring block by DC mode if the neighboring block is on the different side of the boundary of the region from the current block;
• forming data for processing the current syntax element based on the prediction mode information associated with the neighboring block;
• and
• performing context adaptive entropy decoding processing on the current syntax element according to the formed data to determine the current luma intra mode,
• wherein the region is a row of largest coding units (LCUs) or a tile.