Method and apparatus for deriving rice parameter in video/image coding system

A video encoding method performed by an encoding apparatus, the method comprising:

• generating information representing a level value of a transform coefficient in a current block;
• deriving a rice parameter for the information representing the level value of the transform coefficient based on a quantization parameter of the current block;
• deriving a bin string for the information representing the level value of the transform coefficient based on the rice parameter;
• and
• encoding the bin string,
• wherein the rice parameter is derived based on a maximum value of the rice parameter and a shift value for the quantization parameter.

A transmission method of data for an image, the method comprising:

• obtaining a bitstream of the image, wherein the bitstream is generated based on generating information representing a level value of a transform coefficient in a current block, deriving a rice parameter for the information representing the level value of the transform coefficient based on a quantization parameter of the current block, deriving a bin string for the information representing the level value of the transform coefficient based on the rice parameter, and encoding the bin string;
• and
• transmitting the data comprising the bitstream,
• wherein the rice parameter is derived based on a maximum value of the rice parameter and a shift value for the quantization parameter.