Issues of the parameters of deblocking filter in the specification text

[XieFuchun]

In 8.8.3.6.1 Decision process for luma block edges,

the sentence: “The sample values pi,k and qj,k with i = 0..maxFilterLengthP, j = 0..maxFilterLengthQ and k = 0 and 3 are derived as follows:” should be updated to “The sample values pi,k and qj,k with i = 0..max(2, maxFilterLengthP) , j = 0..max(2, maxFilterLengthQ) and k = 0 and 3 are derived as follows:”.

Otherwise, for the case CU 4x4, maxFilterLengthP = 1 and maxFilterLengthQ= 1, the obtained results for the equations (8-1066), (8-1067), (8-1068), and (8-1069) are wrong, and so the final decision for the luma deblocking process is not good. Please check it.

[XieFuchun]

In 8.8.3.6.1 Decision process for luma block edges,

the sentence: “The sample values pi,k and qj,k with i = 0..maxFilterLengthP, j = 0..maxFilterLengthQ and k = 0 and 3 are derived as follows:” should be updated to “The sample values pi,k and qj,k with i = 0..max(2, maxFilterLengthP) , j = 0..max(2, maxFilterLengthQ) and k = 0 and 3 are derived as follows:”.

Otherwise, for the case CU 4x4, maxFilterLengthP = 1 and maxFilterLengthQ= 1, the obtained results for the equations (8-1077), (8-1078), (8-1079), and (8-1080) are wrong, and so the final decision for the luma deblocking process is not good. Please check it.

[Kenneth]

Good catch. Agree to the suggestion.

[bbross]

Thanks for reporting.

This will be fixed JVET-P2001-vC.