In-loop deblocking for intra-coded images or frames

Abstract

Methods and encoders/decoders for applying in-loop deblocking to intra-coded images/frames. In a decoding context, a deblocking filter is applied to reconstructed pixels of an intra-coded block prior to decoding the subsequent block in the decoding sequence. In an encoding context, a deblocking filter is applied to reconstructed pixels of an intra-coded block in an inter-coding loop before encoding a subsequent block in the coding order for the image.

1 . A method for generating a block of predictions for reconstructing a current intra-coded block of video data, the method comprising:
 obtaining filtered pixel data by applying filtering to reconstructed pixel data neighbouring the current block; and   generating the block of predictions based upon the filtered pixel data.   
     
     
         2 . The method claimed in  claim 1 , wherein the reconstructed pixel data comprises pixel data from at least one previously reconstructed block. 
     
     
         3 . The method claimed in  claim 1 , wherein the reconstructed pixel data comprises pixel data to the left of the current block. 
     
     
         4 . The method claimed in  claim 1 , wherein the reconstructed pixel data comprises pixel data above the current block. 
     
     
         5 . The method claimed in  claim 1 , wherein the current block and the block of predictions each comprise a 4×4 block. 
     
     
         6 . The method claimed in  claim 1 , wherein the current block is from an intra-coded frame of a video. 
     
     
         7 . The method claimed in  claim 1 , further comprising identifying a prediction mode. 
     
     
         8 . The method claimed in  claim 1 , wherein generating the block of predictions is further based upon a prediction mode. 
     
     
         9 . The method claimed in  claim 1 , wherein the predictions and the reconstructed pixel data are luminance data. 
     
     
         10 . The method claimed in  claim 1 , wherein the predictions and the reconstructed pixel data are chrominance data. 
     
     
         11 . A decoder for generating a block of predictions for reconstructing a current intra-coded block of video data, the decoder comprising:
 a processor configured to:   obtain filtered pixel data by applying filtering to reconstructed pixel data neighbouring the current block; and   generate the block of predictions based upon the filtered pixel data.   
     
     
         12 . The decoder claimed in  claim 11 , wherein the reconstructed pixel data comprises pixel data from at least one previously reconstructed block. 
     
     
         13 . The decoder claimed in  claim 11 , wherein the reconstructed pixel data comprises pixel data to the left of the current block. 
     
     
         14 . The decoder claimed in  claim 11 , wherein the reconstructed pixel data comprises pixel data above the current block. 
     
     
         15 . The decoder claimed in  claim 11 , wherein the current block and the block of predictions each comprise a 4×4 block. 
     
     
         16 . The decoder claimed in  claim 11 , wherein the current block is from an intra-coded frame of a video. 
     
     
         17 . The decoder claimed in  claim 11 , wherein the processor is further configured to identify a prediction mode. 
     
     
         18 . The decoder claimed in  claim 11 , wherein the processor is configured to generate the block of predictions further based upon a prediction mode. 
     
     
         19 . The decoder claimed in  claim 11 , wherein the predictions and the reconstructed pixel data are luminance data. 
     
     
         20 . The decoder claimed in  claim 11 , wherein the predictions and the reconstructed pixel data are chrominance data. 
     
     
         21 . A non-transitory processor-readable medium storing processor-executable instructions which, when executed, configure one or more processors to perform the method claimed in  claim 1 .