Luma and chroma decoding using a common predictor

Abstract

There are provided video encoders, video decoders, and corresponding methods. A video encoder for encoding video signal data for an image block includes an encoder ( 100 ) for encoding all color components of the video signal data using a common predictor ( 315 ). A video decoder for decoding video signal data for an image block includes a decoder ( 200 ) for decoding all color components of the video signal data using a common predictor ( 430 ). Additionally, an apparatus and method for encoding and decoding signal data for an image block includes an encoder and decoder for encoding/decoding color components of the video signal data without applying a residual color transform thereto. Furthermore, a video encoder and decoder for encoding/decoding video signal data for an image block includes an encoder and decoder for encoding/decoding the video signal data using unique predictors for each of color components of the video signal data.

1 . A video decoder for decoding video signal data for an image block, the video decoder comprising a decoder ( 200 ) for decoding all color components of the video signal data using a common predictor. 
     
     
         2 . The video decoder of  claim 1 , wherein the common predictor is a luma predictor used for both luma and chroma components of the video signal data. 
     
     
         3 . The video decoder of  claim 1 , wherein said decoder ( 200 ) uses a common spatial prediction mode for all of the color components of the video signal data. 
     
     
         4 . The video decoder of  claim 3 , wherein the common spatial prediction mode is set by prev_intra8×8_pred_mode_flag, rem_intra8×8_pred_mode, prev_intra4×4_pred_mode_flag, and rem_intra4×4_pred_mode parameters of the International Telecommunication Union, Telecommunication Sector H.264 standard. 
     
     
         5 . The video decoder of  claim 1 , wherein said decoder ( 200 ) uses common interpolation filters for B and P frames for all of the color components of the video signal data. 
     
     
         6 . The video decoder of  claim 1 , wherein the image block is decoded without a residual color transform applied thereto. 
     
     
         7 . The video decoder of  claim 1 , wherein sampling of the video signal data corresponds to any of the 4:4:4, 4:2:2 and 4:2:0 formats of the International Telecommunication Union, Telecommunication Sector H.264 standard. 
     
     
         8 . A method for decoding video signal data for an image block, the method comprising decoding ( 430 ) all color components of the video signal data using a common predictor. 
     
     
         9 . The method of  claim 8 , wherein the common predictor is a luma predictor used for both luma and chroma components of the video signal data. 
     
     
         10 . The method of  claim 8 , wherein a common spatial prediction mode is used for all of the color components of the video signal data. 
     
     
         11 . The method of  claim 10 , wherein the common spatial prediction mode is set by prev_intra8×8_pred_mode_flag, rem_intra8×8_pred_mode, prev_intra4×4_pred_mode_flag, and rem_intra4×4_pred_mode parameters of the International Telecommunication Union, Telecommunication Sector H.264 standard. 
     
     
         12 . The method of  claim 8 , wherein common interpolation filters are used for B and P frames for all of the color components of the video signal data. 
     
     
         13 . The method of  claim 8 , wherein said decoding step decodes all of the color components of the video signal data without applying a residual color transform thereto. 
     
     
         14 . The method of  claim 8 , further comprising performing ( 464 ) an inverse color transform on the video signal data in a post-processing step subsequent to said decoding step. 
     
     
         15 . The method of  claim 8 , wherein sampling of the video signal data corresponds to any of the 4:4:4, 4:2:2 and 4:2:0 formats of the International Telecommunication Union, Telecommunication Sector H.264 standard.