Method and apparatus for block vector prediction with integer offsets in intra picture block compensation

A video encoder for video encoding, comprising:

• processing circuitry configured to
• determine whether a current block in the current picture is to be coded in intra block copy (IBC) mode,
• in response to a determination that the current block is coded in the IBC mode, determine whether a mode with a motion vector offset is enabled for the IBC encoded current block,
• in response to a determination that the mode with the motion vector offset is enabled for the IBC encoded current block, encode the current block in accordance with an offset associated with the current block, and
• generate a coded video bitsteam based on the encoded current block,
• wherein fractional offsets are not permitted for the IBC encoded current block irrespective of whether a first flag that indicates whether fractional offsets are permitted for the mode with the motion vector offset is a value permitting fractional offsets, and
• wherein, in response to a determination that the motion vector offset is a fractional offset, the motion vector offset is left shifted such that the motion vector offset is converted from the fractional offset to an integer offset.

A non-transitory computer readable medium having instructions stored therein, which when executed by processing circuitry, cause the processing circuitry perform a method of video encoding, the method comprising:

• determining whether a current block in a current picture is to be coded in intra block copy (IBC) mode;
• in response to determining that the current block is to be coded in the IBC mode, determining whether a mode with a motion vector offset is enabled for the current block;
• in response to determining that the mode with the motion vector offset is enabled for the current block, encoding the current block in accordance with an offset associated with the current block;
• and
• generating a coded video bitsteam based on the encoded current block,
• wherein fractional offsets are not permitted for the current block irrespective of whether a first flag that indicates whether fractional offsets are permitted for the mode with the motion vector offset is a value permitting fractional offsets,
• wherein, in response to a determination that the motion vector offset is a fractional offset, the motion vector offset is left shifted such that the motion vector offset is converted from the fractional offset to an integer offset.