Method and apparatus for coding video data in transform-skip mode

Abstract

A method and apparatus for video processing include: determining to skip a transform process for a prediction residual based on a maximum transform size of a prediction block; and signaling the maximum transform size in a sequence parameter set (SPS).

What is claimed is: 
     
         1 . A video processing method, comprising:
 determining to skip a transform process for a prediction residual based on a maximum transform size of a prediction block; and   signaling the maximum transform size in a sequence parameter set (SPS).   
     
     
         2 . The method of  claim 1 , further comprising:
 determining to skip the transform process further based on a parameter indicative of a transform skip mode.   
     
     
         3 . The method of  claim 1 , wherein determining to skip the transform process for the prediction residual comprises:
 determining to skip the transform process based on a determination that no dimension of the prediction block is larger than a threshold, the threshold having a maximum value equal to one of
 a maximum value of a dimension of a luma sample of the prediction block, or 
 a maximum value of a dimension of the prediction block. 
   
     
     
         4 . The method of  claim 3 , wherein the one of the maximum value of the dimension of the luma sample or the maximum value of the dimension of the prediction block is a dynamic value. 
     
     
         5 . The method of  claim 3 , wherein the dimension of the prediction block comprises a height or a width. 
     
     
         6 . The method of  claim 3 , wherein the maximum value of the threshold is 64. 
     
     
         7 . The method of  claim 3 , wherein the maximum value of the threshold is 32. 
     
     
         8 . The method of  claim 3 , wherein a minimum value of the threshold is 4. 
     
     
         9 . The method of  claim 3 , wherein the threshold is equal to the maximum value of the dimension of the luma sample indicative of luminance information of the prediction block. 
     
     
         10 . The method of  claim 3 , wherein the maximum value of the threshold is determined based on at least a first parameter in a first parameter set. 
     
     
         11 . The method of  claim 10 , wherein the first parameter set is a sequence parameter set (SPS). 
     
     
         12 . The method of  claim 10 , wherein a value of the first parameter is 0 or 1. 
     
     
         13 . The method of  claim 10 , wherein the maximum value of the threshold is determined based on at least the first parameter in the first parameter set and a third parameter in the first parameter set. 
     
     
         14 . The method of  claim 10 , wherein the maximum value of the threshold is determined based on a value of a second parameter in a second parameter set, and the value of the second parameter is determined based on the value of the first parameter. 
     
     
         15 . The method of  claim 14 , wherein the value of the second parameter has a minimum value of 0 and a maximum value equal to a sum of three and the value of the first parameter. 
     
     
         16 . The method of  claim 14 , wherein the second parameter has a first value in a first profile of an encoder and a second value in a second profile of the encoder, the first value and the second value being different. 
     
     
         17 . The method of  claim 14 , wherein the second parameter set s the SPS. 
     
     
         18 . The method of  claim 14 , wherein the second parameter set is a picture parameter set (PPS). 
     
     
         19 . An apparatus, comprising:
 a memory configured to store instructions; and   a processor configured to execute the instructions to cause the apparatus to perform:
 determining to skip a transform process for a prediction residual based on a maximum transform size of a prediction block; and 
 signaling the maximum transform size in a sequence parameter set (SPS). 
   
     
     
         20 . A non-transitory computer-readable medium storing a set of instructions that is executable by at least one processor of an apparatus to cause the apparatus to perform a method, the method comprising:
 determining to skip a transform process for a prediction residual based on a maximum transform size of a prediction block; and   signaling the maximum transform size in a sequence parameter set (SPS).