Deblocking filtering control for illumination compensation

A deblocking filtering control device, wherein said deblocking filtering control device is configured to:

• decide whether to apply deblocking filtering to sample values in a sample block in a picture and in a neighboring sample block in said picture based on i) whether illumination compensation is enabled for sample prediction values in a first prediction block in a reference picture for said sample block and/or ii) whether illumination compensation is enabled for sample prediction values in a second prediction block in said reference picture or another reference picture for said neighboring sample block, said sample block and said neighboring sample block being separated in said picture by a block boundary;
• decide whether to apply strong deblocking filtering or weak deblocking filtering to said sample values in said sample block and in said neighboring sample block based on whether illumination compensation is enabled for at least one of said sample block and said neighboring sample block;
• and
• determine a value of at least one parameter selected from a group consisting of parameters β and tc based on whether illumination compensation is enabled for at least one of said sample block and said neighboring sample block;
• wherein said deblocking filtering control device is configured to decide whether to apply said strong deblocking filtering or said weak deblocking filtering comprises deciding to apply said strong deblocking filtering to said sample values in said sample block and in said neighboring sample block if 2×(|p2i−2p1i+p0i|+|q2i−2q1i+q0i|)<(β>>2), |p3i−p0i|+|q3i−q0i|<(β>>3) and |p0i−q0i|<((5×tc+1)>>1), wherein i=0, 3, and otherwise deciding to apply said weak deblocking filtering to said sample values in said sample block and in said neighboring sample block, wherein p0i denotes a sample value of a first sample, relative to said block boundary, in a line i of samples in said sample block, p1i denotes a sample value of a second sample, relative to said block boundary, in said line i of samples in said sample block, p2i denotes a sample value of a third sample, relative to said block boundary, in said line i of samples in said sample block, q0i denotes a sample value of a first sample, relative to said block boundary, in said line i of samples in said neighboring sample block, q1i denotes a sample value of a second sample, relative to said block boundary, in said line i of samples in said neighboring sample block, and q2i denotes a sample value of a third sample, relative to said block boundary, in said line i of samples in said neighboring sample block.

A deblocking filtering control device comprising a decision module for:

• deciding whether to apply deblocking filtering to sample values in a sample block in a picture and in a neighboring sample block in said picture based on i) whether illumination compensation is enabled for sample prediction values in a first prediction block in a reference picture for said sample block and/or ii) whether illumination compensation is enabled for sample prediction values in a second prediction block in said reference picture or another reference picture for said neighboring sample block, said sample block and said neighboring sample block being separated in said picture by a block boundary, wherein the deciding whether to apply deblocking filtering comprises deciding to apply deblocking filtering to said sample values in said sample block and in said neighboring sample block based on whether illumination compensation is enabled for at least one of said sample block and said neighboring sample block;
• deciding whether to apply strong deblocking filtering or weak deblocking filtering to said sample values in said sample block and in said neighboring sample block based on whether illumination compensation is enabled for at least one of said sample block and said neighboring sample block;
• and
• determining a value of at least one parameter selected from a group consisting of parameters β and tc based on whether illumination compensation is enabled for at least one of said sample block and said neighboring sample block;
• wherein the deciding whether to apply said strong deblocking filtering or said weak deblocking filtering comprises deciding to apply said strong deblocking filtering to said sample values in said sample block and in said neighboring sample block if 2×(|p2i−2p1i+p0i|+|q2i−2q1i+q0i|)<(β>>2), |p3i−p0i|+|q3i−q0i|<(β>>3) and |p0i−q0i|<((5×tc+1)>>1), wherein i=0, 3, and otherwise deciding to apply said weak deblocking filtering to said sample values in said sample block and in said neighboring sample block, wherein p0i denotes a sample value of a first sample, relative to said block boundary, in a line i of samples in said sample block, p1i denotes a sample value of a second sample, relative to said block boundary, in said line i of samples in said sample block, p2i denotes a sample value of a third sample, relative to said block boundary, in said line i of samples in said sample block, q0i denotes a sample value of a first sample, relative to said block boundary, in said line i of samples in said neighboring sample block, q1i denotes a sample value of a second sample, relative to said block boundary, in said line i of samples in said neighboring sample block, and q2i denotes a sample value of a third sample, relative to said block boundary, in said line i of samples in said neighboring sample block.

A non-transitory computer-readable storage medium comprising a computer program product comprising instructions, which when executed by at least one processor, cause said at least one processor to:

• decide whether to apply deblocking filtering to sample values in a sample block in a picture and in a neighboring sample block in said picture based on i) whether illumination compensation is enabled for sample prediction values in a first prediction block in a reference picture for said sample block and/or ii) whether illumination compensation is enabled for sample prediction values in a second prediction block in said reference picture or another reference picture for said neighboring sample block, said sample block and said neighboring sample block being separated in said picture by a block boundary;
• decide whether to apply strong deblocking filtering or weak deblocking filtering to said sample values in said sample block and in said neighboring sample block based on whether illumination compensation is enabled for at least one of said sample block and said neighboring sample block;
• and
• determine a value of at least one parameter selected from a group consisting of parameters β and tc based on whether illumination compensation is enabled for at least one of said sample block and said neighboring sample block;
• wherein said deblocking filtering control device is configured to decide whether to apply said strong deblocking filtering or said weak deblocking filtering comprises deciding to apply said strong deblocking filtering to said sample values in said sample block and in said neighboring sample block if 2×(|p2i−2p1i+p0i|+|q2i−2q1i+q0i|)<(β>>2), |p3i−p0i|+|q3i−q0i|<(β>>3) and |p0i−q0i|<((5×tc+1)>>1), wherein i=0, 3, and otherwise deciding to apply said weak deblocking filtering to said sample values in said sample block and in said neighboring sample block, wherein p0i denotes a sample value of a first sample, relative to said block boundary, in a line i of samples in said sample block, p1i denotes a sample value of a second sample, relative to said block boundary, in said line i of samples in said sample block, p2i denotes a sample value of a third sample, relative to said block boundary, in said line i of samples in said sample block, q0i denotes a sample value of a first sample, relative to said block boundary, in said line i of samples in said neighboring sample block, q1i denotes a sample value of a second sample, relative to said block boundary, in said line i of samples in said neighboring sample block, and q2i denotes a sample value of a third sample, relative to said block boundary, in said line i of samples in said neighboring sample block.