Method and apparatus for reduction of deblocking filter

A method of deblocking for reconstructed video in a video coding system, the method comprising:

• receiving reconstructed pixel data, wherein the reconstructed pixel data is configured into LCUs (largest coding units) and each LCU is divided into blocks;
• identifying horizontal block edges of the blocks in the LCUs, wherein the horizontal block edges are divided into a first edge group and a second edge group, and wherein the first edge group corresponds to horizontal block edges between two LCUs and the second edge group corresponds to remaining horizontal block edges not included in the first edge group;
• applying first vertical filtering to the reconstructed pixel data corresponding to one or more first lines above a first horizontal block edge in the first edge group;
• and
• applying second vertical filtering to the reconstructed pixel data corresponding to one or more second lines above a second horizontal block edge in the second edge group, wherein a first number of said one or more first lines is smaller than a second number of said one or more second lines.

An apparatus for deblocking of reconstructed video in a video coding system, the apparatus comprising:

• means for receiving reconstructed pixel data associated with a block boundary between two adjacent N×N blocks, where N is an integer;
• means for separating the block boundary into a first sub-boundary and a second sub-boundary for a vertical boundary or horizontal boundary;
• means for determining a first pixel group, wherein the first pixel group comprises a first group of line segments across the first sub-boundary of the vertical boundary or a first group of column segments across the first sub-boundary of the horizontal boundary;
• means for determining a second pixel group, wherein the second pixel group comprises a second group of line segments across the second sub-boundary of the vertical boundary or a second group of column segments across the second sub-boundary of the horizontal boundary;
• means for determining a first filter decision for the first sub-boundary based on the first pixel group;
• means for determining a second filter decision for the second sub-boundary based on the second pixel group;
• means for applying deblocking filter to the first sub-boundary according to the first filter decision;
• and
• means for applying deblocking filter to the second sub-boundary according to the second filter decision.

An apparatus of deblocking for reconstructed video in a video coding system, the apparatus comprising:

• means for receiving reconstructed pixel data, wherein the reconstructed pixel data is configured into LCUs (largest coding units) and each LCU is divided into blocks;
• means for identifying horizontal block edges of the blocks in the LCUs, wherein the horizontal block edges are divided into a first edge group and a second edge group, and wherein the first edge group corresponds to horizontal block edges between two LCUs and the second edge group corresponds to remaining horizontal block edges not included in the first edge group;
• means for applying first vertical filtering to the reconstructed pixel data corresponding to one or more first lines above a first horizontal block edge in the first edge group;
• and
• means for applying second vertical filtering to the reconstructed pixel data corresponding to one or more second lines above a second horizontal block edge in the second edge group, wherein a first number of said one or more first lines is smaller than a second number of said one or more second lines.