Encoder and decoder, encoding method and decoding method with complexity handling for flexibly sized picture partitions

A method of video decoding, the method comprising:

• decoding, from a data stream, a first flag that indicates whether inter prediction is allowed for a portion of a current picture;
• responsive to the first flag indicating that inter prediction is not allowed for the portion of the current picture, decoding a second flag from the data stream that indicates whether the portion of the current picture is coded using intra block copy (IBC);
• and
• responsive to the second flag indicating the portion of the current picture is coded using IBC, applying IBC to reconstruct the portion of the current picture.

An apparatus for video encoding, the apparatus comprising:

• at least one memory;
• and
• one or more hardware processors configured to read instructions from the at least one memory to perform operations comprising:
• encoding, into a data stream, a first flag that indicates whether inter prediction is allowed for a portion of a current picture;
• responsive to the first flag indicating that inter prediction is not allowed for the portion of the current picture, encoding a second flag into the data stream that indicates whether the portion of the current picture is coded using intra block copy (IBC);
• and
• responsive to the second flag indicating the portion of the current picture is coded using IBC, encoding a prediction residual into the data stream, wherein the prediction residual is determined based on applying IBC to reconstruct the portion of the current picture.

A method of video encoding, the method comprising:

• encoding, into a data stream, a first flag that indicates whether inter prediction is allowed for a portion of a current picture;
• responsive to the first flag indicating that inter prediction is not allowed for the portion of the current picture, encoding a second flag into the data stream that indicates whether the portion of the current picture is coded using intra block copy (IBC);
• and
• responsive to the second flag indicating the portion of the current picture is coded using IBC, encoding a prediction residual into the data stream, wherein the prediction residual is determined based on applying IBC to reconstruct the portion of the current picture.