Method, apparatus and system for de-blocking video data

Abstract

A method of de-blocking video data is disclosed. The video data encoding colour channels in a 4:2:2 format is received. The video data is encoded in a quad-tree. A plurality of transform units is generated for one of the colour channels, each of the transform units including at least one transform. A distance from an edge of one of the transform units to a boundary of a transform of the transform unit is determined. An edge flag for the transform unit is determined, the edge flag indicating the determined distance. De-blocking is applied to the transform units of the video data according to the determined edge flag.

1 . A method of de-blocking video data, the method comprising:
 receiving the video data having colour channels in a 4:2:2 format;   determining a size of the transform unit containing data of a plurality of chroma sample arrays for a single chroma channel of the colour channels, the data of the plurality of chroma sample arrays being provided using a plurality of chroma square transforms;   determining a chroma boundary in the transform unit for the single chroma channel according to a size of the plurality of chroma square transforms defined by the determined size of the transform unit; and   applying de-blocking to the determined chroma boundary in the transform units of the video data.   
     
     
         2 . The method according to  claim 1 , wherein the size of the transform unit is determined based on a hierarchical level of a transform unit. 
     
     
         3 . The method according to  claim 1 , further comprising:
 applying a square inverse transform for data each of the plurality of chroma sample arrays to produce chroma samples;   wherein the de-blocking is applied to the chroma samples in the video data.   
     
     
         4 . An apparatus for de-blocking video data, the apparatus comprising:
 means for receiving the video data having colour channels in a 4:2:2 format;   means for determining a size of the transform unit containing data of a plurality of chroma sample arrays for a single chroma channel of the colour channels, the data of the plurality of chroma sample arrays being provided using a plurality of chroma square transforms;   means for determining a chroma boundary in the transform unit for the single chroma channel according to a size of the plurality of chroma square transforms defined by the determined size of the transform unit; and   means for applying de-blocking to the determined chroma boundary in the transform units of the video data.   
     
     
         5 . The apparatus according to  claim 4 , wherein the size of the transform unit is determined based on a hierarchical level of a transform unit. 
     
     
         6 . The apparatus according to  claim 4 , further comprising:
 means for applying a square inverse transform for data each of the plurality of chroma sample arrays to produce chroma samples;   wherein the de-blocking is applied to the chroma samples in the video data.   
     
     
         7 . A non-transitory computer readable medium comprising a computer program for de-blocking video data, the program comprising:
 code for receiving the video data having colour channels in a 4:2:2 format;   code for determining a size of the transform unit containing data of a plurality of chroma sample arrays for a single chroma channel of the colour channels, the data of the plurality of chroma sample arrays being provided using a plurality of chroma square transforms;   code for determining a chroma boundary in the transform unit for the single chroma channel according to a size of the plurality of chroma square transforms defined by the determined size of the transform unit; and   code for applying de-blocking to the determined chroma boundary in the transform units of the video data.   
     
     
         8 . The non-transitory computer readable medium according to  claim 7 , wherein the size of the transform unit is determined based on a hierarchical level of a transform unit. 
     
     
         9 . The non-transitory computer readable medium according to  claim 7 , further comprising:
 code for applying a square inverse transform for data each of the plurality of chroma sample arrays to produce chroma samples;   wherein the de-blocking is applied to the chroma samples in the video data.