Segmentation-based parameterized motion models

Abstract

An apparatus for decoding a current block of a video frame includes a memory and a processor. The processor is configured to execute instructions stored in the memory to identify a parameterized motion model; associate the parameterized motion model with a segment of a reference frame; and, in response to determining that the current block is encoded using the parameterized motion model, decode the current block using the parameterized motion model.

What is claimed is: 
     
         1 . An apparatus for decoding a current block of a video frame, comprising:
 a memory; and   a processor, the processor configured to execute instructions stored in the memory to:
 identify a parameterized motion model; 
 associate the parameterized motion model with a segment of a reference frame; and 
 in response to determining that the current block is encoded using the parameterized motion model, decode the current block using the parameterized motion model. 
   
     
     
         2 . The apparatus of  claim 1 , wherein to determine that the current block is encoded using the parameterized motion model comprises to:
 decode, from a compressed bitstream, an indicator identifying that the current block is encoded using the parameterized motion model.   
     
     
         3 . The apparatus of  claim 2 , wherein the indicator comprises a global motion model type. 
     
     
         4 . The apparatus of  claim 3 , wherein the global motion model type indicates global motion or zero global motion. 
     
     
         5 . The apparatus of  claim 3 , wherein the instructions further comprise instructions to:
 determine parameters of the parameterized motion model based on the global motion model type.   
     
     
         6 . The apparatus of  claim 5 , wherein to identify the parameterized motion model corresponding to the global motion model type comprises to:
 decode, from the compressed bitstream, the global motion model type; and   determine parameters of the parameterized motion model based on the global motion model type.   
     
     
         7 . The apparatus of  claim 1 , wherein to determine that the current block is encoded using the parameterized motion model comprises to:
 decode, from a compressed bitstream, parameters of the parameterized motion model.   
     
     
         8 . The apparatus of  claim 1 , wherein the instructions further comprise instructions to:
 in response to determining that the current block is not encoded using the parameterized motion model, decode the current block using translational motion compensation.   
     
     
         9 . The apparatus of  claim 8 , wherein to determine that the current block is not encoded using the parameterized motion model comprises to:
 decode, from a compressed bitstream, an indicator identifying that the current block is encoded using zero global motion.   
     
     
         10 . An apparatus for decoding a current block of a video frame, the apparatus configured to:
 identify a parameterized motion model;   associate the parameterized motion model with a segment of a reference frame; and   in response to determining that the current block is encoded using the parameterized motion model, decode the current block using the parameterized motion model.   
     
     
         11 . The apparatus of  claim 10 , wherein to determine that the current block is encoded using the parameterized motion model comprises to:
 decode, from a compressed bitstream, an indicator identifying that the current block is encoded using the parameterized motion model.   
     
     
         12 . A method of decoding a current block of a video frame, comprising:
 identifying a parameterized motion model;   associating the parameterized motion model with a segment of a reference frame; and   in response to determining that the current block is encoded using the parameterized motion model, decoding the current block using the parameterized motion model.   
     
     
         13 . The method of  claim 12 , wherein the determining that the current block is encoded using the parameterized motion model comprises:
 decoding, from a compressed bitstream, an indicator identifying that the current block is encoded using the parameterized motion model.   
     
     
         14 . The method of  claim 13 , wherein the indicator comprises a global motion model type. 
     
     
         15 . The method of  claim 14 , wherein the global motion model type indicates global motion or zero global motion. 
     
     
         16 . The method of  claim 14 , further comprising:
 determining parameters of the parameterized motion model based on the global motion model type.   
     
     
         17 . The method of  claim 14 , wherein the identifying the parameterized motion model corresponding to the global motion model type comprises:
 decoding, from the compressed bitstream, the global motion model type; and   determining parameters of the parameterized motion model based on the global motion model type.   
     
     
         18 . The method of  claim 12 , wherein the determining that the current block is encoded using the parameterized motion model comprises:
 decoding, from a compressed bitstream, parameters of the parameterized motion model.   
     
     
         19 . The method of  claim 12 , further comprising:
 in response to determining that the current block is not encoded using the parameterized motion model, decoding the current block using translational motion compensation.   
     
     
         20 . The method of  claim 19 , wherein the determining that the current block is not encoded using the parameterized motion model comprises:
 decoding, from a compressed bitstream, an indicator identifying that the current block is encoded using zero global motion.