In loop chroma deblocking filter

A computer system, comprising:

• at least one processor;
• at least one memory comprising instructions configured to be executed by the at least one processor to perform a decoding method comprising:
• responsive to coded video data received from a channel, parsing the coded video data into portions representing coded Largest Coding Units (LCUs);
• and
• decoding coded data of the LCUs in a coding order, wherein the decoding of an LCU includes:
• decoding coded data of any Coding Units (CUs) contained in the respective LCU;
• and
• prior to a decoding of a next LCU, performing deblocking filtering along a seam between the respective LCU and an adjacent LCU that was decoded prior to the decoding of the respective LCU;
• wherein the performing includes:
• determining the seam is not an edge based on a calculation of a smoothness metric of a CU comprising data along the seam;
• responsive to the determination that the seam is not an edge, calculating a textureness metric of the respective LCU;
• responsive to a determination that the calculated textureness metric indicates that the seam is across a texture, lowering a deblocking filter strength to be applied for filtering of the seam;
• and
• responsive to a determination that the calculated textureness metric indicates that the seam is not across a texture, increasing the deblocking filter strength to be applied for filtering of the seam.

A non-transitory computer-readable medium comprising instructions executable by at least one processor to perform a decoding method, the decoding method comprising:

• responsive to coded video data received from a channel, parsing the coded video data into portions representing coded Largest Coding Units (LCUs);
• and
• decoding coded data of the LCUs in a coding order, wherein the decoding of an LCU includes:
• decoding coded data of any Coding Units (CUs) contained in the respective LCU;
• and prior to a decoding of a next LCU, performing deblocking filtering along a seam between the respective LCU and an adjacent LCU that was decoded prior to the decoding of the respective LCU;
• wherein the performing includes:
• determining the seam is not an edge based on a calculation of a smoothness metric of a CU comprising data along the seam;
• responsive to the determination that the seam is not an edge, calculating a textureness metric of the respective LCU;
• responsive to a determination that the calculated textureness metric indicates that the seam is across a texture, lowering a deblocking filter strength to be applied for filtering of the seam;
• and
• responsive to a determination that the calculated textureness metric indicates that the seam is not across a texture, increasing the deblocking filter strength to be applied for filtering of the seam.