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AHG9: On deblocking control signalling
Abstract
This contribution asserted that the current signalling for deblocking filter control is complex and may be simplified. For example, the current desgin allows the deblocking to be disabled at the PPS level and then later to be enabled either in picture header or the slice header. Such design may be confusing and make the signalling more difficult to understand.
JVET-R0183 AHG9: On deblocking control signalling [S. Paluri, Hendry, S. Kim (LGE)]
Discussed in AHG Session 1.8 (chaired by GJS & YKW).
This contribution asserted that the current signalling for deblocking filter control is complex and may be simplified. For example, the current design allows the deblocking to be disabled at the PPS level and then later to be enabled either in picture header or the slice header. It is asserted that such design may be confusing and make the signalling more difficult to understand.
This contribution proposed the following changes:
- Signal a flag in the PPS, i.e., pps_deblocking_enabled_flag to specify whether or not deblocking is enabled / applied to pictures that refer to the PPS.
- When deblocking is enabled (e.g., the value of pps_deblocking_enabled_flag is equal to 1, additional flags can be signalled as follows:
- pps_deblocking_override_enabled_flag, which is an existing flag.
- pps_deblocking_parameter_present_flag to specify whether the PPS deblocking parameter is present.
This is very similar in spirit to JVET-R0072, and is a smaller change.
No clear need for action was identified by the AHG on this, so the AHG did not recommend action.
References:
PATENTS:
WO2001045423A3
0.34
2002-05-10
4047933
0.34
20220377324
0.33
JPH10126856A
0.32
1998-05-15
20260025500
0.32
WO/2021/061814
0.31
TWI392368B
0.30
2013-04-01
20220394247
0.30
Decisions
No clear need for action was identified by the AHG on this, so the AHG did not recommend action.
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