Methods for processing chroma signals
The present disclose provides methods and systems for processing chroma signals. According to some embodiments, the method can include: receiving a sequence parameter set (SPS); and determining, based on a first flag signaled in the SPS, whether chroma residual scaling is enabled or disabled for a slice associated with the SPS.
1. A computer-implemented decoding method, comprising:
determining a value of a pps_chroma_tool_offsets_present_flag signaled in a picture parameter set (PPS) associated with a video sequence; and
in response to the value of the pps_chroma_tool_offsets_present_flag being equal to 1, decoding one or more picture level chroma de-blocking parameters in a bitstream associated with the video sequence,
wherein when the value of the pps_chroma_tool_offsets_present_flag is equal to 0, no picture level chroma de-blocking parameter is signaled in the bitstream, and
wherein the one or more picture level chroma de-blocking parameters comprise at least one of a beta offset or a tc offset.
2. The method according to claim 1 , wherein the one or more picture level chroma de-blocking parameters include:
ph_cb_beta_offset_div2, ph_cb_tc_offset_div2, ph_cr_beta_offset_div2, or ph_cr_tc_offset_div2.
3. A non-transitory computer readable medium storing a bitstream, wherein the bitstream comprises:
a picture parameter set (PPS) associated with a video sequence, the PPS comprising a pps_chroma_tool_offsets_present_flag indicating whether chroma de-blocking parameters are signaled in the bitstream,
wherein when a value of the pps_chroma_tool_offsets_present_flag is equal to 1, the bitstream comprises one or more picture level chroma de-blocking parameters,
wherein when the value of the pps_chroma_tool_offsets_present_flag is equal to 0, the bitstream does not comprise the one or more picture level chroma de-blocking parameters, and
wherein the one or more picture level chroma de-blocking parameters comprise at least one of a beta offset or a tc offset.
4. The non-transitory computer readable medium according to claim 3 , wherein the one or more picture level chroma de-blocking parameters include:
ph_cb_beta_offset_div2, ph_cb_tc_offset_div2, ph_cr_beta_offset_div2, or ph_cr_tc_offset_div2.
5. A computer-implemented encoding method, comprising:
determining a value of a pps_chroma_tool_offsets_present_flag signaled in a picture parameter set (PPS) associated with a video sequence; and
in response to the value of the pps_chroma_tool_offsets_present_flag being equal to 1, signaling one or more picture level chroma de-blocking parameters in a bitstream associated with the video sequence,
wherein when the value of the pps_chroma_tool_offsets_present_flag is equal to 0, no picture level chroma de-blocking parameter is signaled in the bitstream, and
wherein the one or more picture level chroma de-blocking parameters comprise at least one of a beta offset or a tc offset.
6. The method according to claim 5 , wherein the chroma de-blocking parameters are signaled in a picture header.
7. The method according to claim 5 , wherein the one or more picture level chroma de-blocking parameters include:
ph_cb_beta_offset_div2, ph_cb_tc_offset_div2, ph_cr_beta_offset_div2, or ph_cr_tc_offset_div2.