Determining regions when performing intra block copying

A method of encoding video data comprising:

• dividing, by one or more processors, a picture into a plurality of slices or a plurality of tiles;
• performing, by the one or more processors, an intra block copying process to code a current block of the picture, wherein the current block comprises one of a current prediction unit (PU) or a current transform unit (TU) of a current coding unit (CU), the intra block copying process comprising:
• identifying a search region in a video picture for the current block that does not include pixels from a different one of the plurality of slices or from a different one of the plurality of tiles in which the current block resides, the current CU is in a coding tree unit (CTU) of the picture, and the search region only includes the CTU in which the coded current CU resides and not a CTU to the left of the CTU in which the coded current CU resides;
• after identifying the search region, accessing each block within the search region, determining a difference between each block accessed within the search region and the current block, and selecting a prediction block from each of the blocks accessed within the search region that resulted in a smallest difference between the accessed blocks and the current block;
• encoding the current block based on the prediction block selected from the search region comprising identify a prediction block that resides at least partially within the determined search region and that does not overlap the current CU, and encoding the current block based on the identified prediction block.

A video decoding device comprising:

• a memory configured to store a current block of a picture, wherein the current block comprises one of a coded current prediction unit (PU) or a coded current transform unit (TU) of a coded current coding unit (CU), and
• one or more processors configured to perform an intra block copying process to decode the current block, the intra block copying process comprising:
• obtaining an offset vector that identifies the prediction block restricted to be within a same slice or a same tile as that in which the coded current block resides, wherein the same slice comprises one of a plurality of slices, or the same tile comprises one of a plurality of tiles, the picture divided into the plurality of slices or the plurality of tiles, the coded current CU is in a coding tree unit (CTU) of the picture, and wherein the same slice or the same tile only includes the CTU in which the coded current CU resides and not a CTU to the left of the CTU in which the coded current CU resides;
• obtaining the prediction block from with the same slice or the same tile in which the coded current block resides based on a location of the coded current block and the offset vector, wherein the prediction block does not overlap the coded current CU;
• and
• decoding the coded current block based on the prediction block.

A video encoding device comprising:

• a memory configured to store a current block of a picture, wherein the current block comprises one of a current prediction unit (PU) or a current transform unit (TU) of a current coding unit (CU);
• and
• one or more processors configured to:
• divide the picture into a plurality of slices or a plurality of tiles;
• perform an intra block copying process to encode the current block, the intra block copying process comprising:
• identifying a search region in a video picture for the current block that does not include pixels from a different one of the plurality of slices or from a different one of the plurality of tiles in which the current block resides, the current CU is in a coding tree unit (CTU) of the picture, and the search region only includes the CTU in which the coded current CU resides and not a CTU to the left of the CTU in which the coded current CU resides;
• after identifying the search region, accessing each block within the search region, determining a difference between each block accessed within the search region and the current block, and selecting a prediction block from each of the blocks accessed within the search region that resulted in a smallest difference between the accessed blocks and the current block;
• and
• encoding the current block based on the prediction block selected from the search region comprising identify a prediction block that resides at least partially within the determined search region and that does not overlap the current CU, and encoding the current block based on the identified prediction block.