Quantization parameter signaling in video processing

Abstract

The present disclosure provides methods for processing video content. One exemplary method comprises: receiving a bitstream comprising coded video data; determining a first parameter of a coding block; determining, according to the first parameter, one or more second parameters associated with a delta quantization parameter (QP) value or a chroma QP offset value; and determining, according to the one or more second parameters, at least one of the delta QP value or the chroma QP offset value.

What is claimed is: 
     
         1 . A system for processing video content, comprising:
 a memory storing a set of instructions; and   at least one processor configured to execute the set of instructions to cause the system to:
 receive a data stream comprising coded video data; 
 determine a first parameter of a coding block, wherein at least one of a delta quantization parameter (QP) value or a chroma QP offset value is determined according to the first parameter; and 
 determine, in a slice header or a picture header associated with the coding block, a maximum value of the first parameter based on a maximum hierarchy depth of coding units. 
   
     
     
         2 . The system according to  claim 1 , wherein the coding block is associated with an intra-prediction slice, and the maximum value of the first parameter is determined in the slice header according to the intra-prediction slice. 
     
     
         3 . The system according to  claim 1 , wherein the coding block is associated with an inter-prediction slice and the maximum value of the first parameter is determined in the slice header according to the inter-prediction slice. 
     
     
         4 . The system according to  claim 1 , wherein in response to the determination of the maximum value of the first parameter in the picture header associated with the coding block, the at least one processor is configured to execute the set of instructions to cause the system to further:
 split the maximum value of the first parameter into an intra slice element and an inter slice element; wherein the intra slice element is for an intra slice, and the inter slice element is for an inter slice.   
     
     
         5 . The system according to  claim 1 , wherein the at least one processor is configured to execute the set of instructions to cause the system to further:
 determine a picture level maximum value of the first parameter;   determine the maximum of the first parameter according to the picture level maximum value;   determine a slice level maximum value of the first parameter; and   determine the maximum of the first parameter to be the slice level maximum value of the first parameter.   
     
     
         6 . The system according to  claim 1 , wherein the at least one processor is configured to execute the set of instructions to cause the system to further:
 determine a luma QP value based on the delta QP value;   determine a chroma QP value based on the chroma QP offset value; and   process the coding block based on the luma QP value and the chroma QP value.   
     
     
         7 . The system according to  claim 1 , wherein the first parameter is signaled in at least one of the slice header or the picture header associated with the coding block. 
     
     
         8 . A computer-implemented method, comprising:
 receiving a data stream comprising coded video data;   determining a first parameter of a coding block, wherein at least one of a delta quantization parameter (QP) value or a chroma QP offset value is determined according to the first parameter; and   determining, in a slice header or a picture header associated with the coding block, a maximum value of the first parameter based on a maximum hierarchy depth of coding units.   
     
     
         9 . The method according to  claim 8 , wherein the coding block is associated with an intra-prediction slice, and the maximum value of the first parameter is determined in the slice header according to the intra-prediction slice. 
     
     
         10 . The method according to  claim 8 , wherein the coding block is associated with an inter-prediction slice, and the maximum value of the first parameter is determined in the slice header according to the inter-prediction slice. 
     
     
         11 . The method according to  claim 8 , further comprising:
 in response to the determination of the maximum value of the first parameter in the picture header associated with the coding block, splitting the maximum value of the first parameter into an intra slice element and an inter slice element; wherein the intra slice element is for an intra slice, and the inter slice element is for an inter slice.   
     
     
         12 . The method according to  claim 8 , wherein determining, in the slice header or the picture header associated with the coding block, the maximum value of the first parameter further comprises:
 determining a picture level maximum value of the first parameter;   determining the maximum of the first parameter according to the picture level maximum value;   determining a slice level maximum value of the first parameter; and   determining the maximum of the first parameter to be the slice level maximum value of the first parameter.   
     
     
         13 . The method according to  claim 8 , further comprising:
 determining a luma QP value based on the delta QP value;   determining a chroma QP value based on the chroma QP offset value; and   processing the coding block based on the luma QP value and the chroma QP value.   
     
     
         14 . The method according to  claim 8 , wherein the first parameter is signaled in at least one of the slice header or the picture header associated with the coding block. 
     
     
         15 . A non-transitory computer readable medium storing a bitstream of a video for processing according to operations comprising:
 determining a first parameter of a coding block, wherein at least one of a delta quantization parameter (QP) value or a chroma QP offset value is determined according to the first parameter; and   determining, in a slice header or a picture header associated with the coding block, a maximum value of the first parameter based on a maximum hierarchy depth of coding units.   
     
     
         16 . The non-transitory computer readable medium according to  claim 15 , wherein the coding block is associated with an intra-prediction slice, and the maximum value of the first parameter is determined in the slice header according to the intra-prediction slice. 
     
     
         17 . The non-transitory computer readable medium according to  claim 15 , wherein the coding block is associated with an inter-prediction slice, and the maximum value of the first parameter is determined in the slice header according to the inter-prediction slice. 
     
     
         18 . The non-transitory computer readable medium according to  claim 15 , wherein the operations further comprise:
 in response to the determination of the maximum value of the first parameter in the picture header associated with the coding block, splitting the maximum value of the first parameter into an intra slice element and an inter slice element; wherein the intra slice element is for an intra slice, and the inter slice element is for an inter slice.   
     
     
         19 . The non-transitory computer readable medium according to  claim 15 , wherein the operations further comprise:
 determining a picture level maximum value of the first parameter;   determining the maximum of the first parameter according to the picture level maximum value;   determining a slice level maximum value of the first parameter; and   determining the maximum of the first parameter to be the slice level maximum value of the first parameter.   
     
     
         20 . The non-transitory computer readable medium according to  claim 15 , wherein the operations further comprise:
 determining a luma QP value based on the delta QP value;   determining a chroma QP value based on the chroma QP offset value; and   processing the coding block based on the luma QP value and the chroma QP value.