Context adaptive binary arithmetic coding method and device

A video encoding method, comprising:

• performing at least one of a context model determination, a probability update, and a probability interval determination on a syntax element;
• arithmetically encoding the syntax element based on the context model determination;
• and
• generating a bitstream including the syntax element arithmetically encoded,
• wherein the context model determination comprises selecting a probability model for the syntax element,
• wherein the probability model for the syntax element of a current block is determined based on a prediction mode of an adjacent block of the current block, and
• wherein the probability model for the syntax element of the current block is determined based on whether the prediction mode of the adjacent block is a matrix weighted intra prediction mode.

A non-transitory computer-readable medium storing a bitstream, the bitstream comprising a syntax element,

• wherein at least one of a context model determination, a probability update, and a probability interval determination on the syntax element is performed based on the syntax element,
• wherein the syntax element is arithmetically decoded based on the context model determination, wherein
• wherein the context model determination comprises selecting a probability model for the syntax element,
• wherein the probability model for the syntax element of a current block is determined based on a prediction mode of an adjacent block of the current block, and
• wherein the probability model for the syntax element of the current block is determined based on whether the prediction mode of the adjacent block is a matrix weighted intra prediction mode.