Method and apparatus for processing video signal

A method of encoding a video signal, comprising:

• identifying a size of a current block,
• determining a prediction mode of the current block based on the size of the current block and a block size permitting an intra block copy (IBC), and
• encoding information on the prediction mode,
• wherein determining the prediction mode comprises determining whether an IBC mode is applied based on a rate-distortion cost for the IBC mode when the size of the current block is smaller than or equal to the block size permitting the IBC, and
• wherein the information on the prediction mode comprises an IBC flag indicating whether the IBC mode is applied.

An apparatus for decoding a video signal, comprising:

• a memory storing the video signal, and
• a processor coupled to the memory and configured to process the video signal,
• wherein the processor is configured to:
• check a size of a current block,
• obtain an intra block copy (IBC) flag indicating whether an IBC is applied to the current block based on the size of the current block and a block size permitting the IBC,
• determine a prediction mode of the current block based on the IBC flag, and
• perform prediction of the current block from a reconstructed block within a current picture based on the prediction mode.

An apparatus for encoding a video signal, comprising:

• a memory storing the video signal, and
• a processor coupled to the memory and configured to process the video signal,
• wherein the processor is configured to:
• check a size of a current block,
• determine a prediction mode of the current block based on the size of the current block and a block size permitting an intra block copy (IBC), and
• encode information on the prediction mode,
• wherein the processor is configured to determine whether an IBC mode is applied based on a rate-distortion cost for the IBC mode when the size of the current block is smaller than or equal to the block size permitting the IBC in order to determine the prediction mode, and
• wherein the information on the prediction mode comprises an IBC flag indicating whether the IBC mode is applied.

A non-transitory computer-readable medium storing one or more instructions,

• wherein the one or more instructions executed by one or more processors enable controls a video signal processing apparatus to:
• check a size of a current block,
• obtain an intra block copy (IBC) flag indicating whether an IBC is applied to the current block based on the size of the current block and a block size permitting the IBC,
• determine a prediction mode of the current block based on the IBC flag, and
• perform prediction of the current block from a reconstructed block within a current picture based on the prediction mode.