Methods and Apparatus for Simplification of Coding Residual Blocks

An apparatus for encoding transform coefficients corresponding to prediction residues in a video coding system, the apparatus comprising one or more electronic circuits or processors arranged to:

• receive quantized transform coefficients for a transform block to be coded;
• determine a Rice parameter for a target transform coefficient in the transform block based on a local sum of absolute levels of neighboring transform coefficients of the target transform coefficient;
• determine a dependent quantization state;
• determine a zero-position variable based on the dependent quantization state and the Rice parameter;
• determine, based on the zero-position variable and an absolute level value of the target transform coefficient, a first syntax element corresponding to a modified absolute level value of the target transform coefficient;
• and
• generate a video bitstream comprising one or more coded bits for the first syntax element, wherein said one or more coded bits are generated by binarizing the first syntax element using one or more codes comprising a Golomb-Rice code with the Rice parameter,
• wherein if the absolute level value of the target transform coefficient is equal to 0, the value of the first syntax element is set equal to the zero-position variable.

A method for decoding transform coefficients corresponding to prediction residues in a video coding system, the method comprising:

• determining a Rice parameter for a target transform coefficient based on a local sum of absolute levels of neighboring transform coefficients of the target transform coefficient;
• determining a dependent quantization state;
• determining a zero-position variable based on the dependent quantization state and the Rice parameter;
• and
• parsing and decoding, from a video bitstream, one or more coded bits associated with a first syntax element for the target transform coefficient in a transform block using one or more codes comprising a Golomb-Rice code with the Rice parameter, wherein the first syntax element corresponds to a modified absolute level value of the target transform coefficient;
• deriving an absolute level value of the target transform coefficient according to the zero-position variable and the first syntax element,
• wherein if the first syntax element have a value equal to the zero-position variable, the absolute level value of the target transform coefficient is set to 0.

An apparatus for decoding transform coefficients corresponding to prediction residues in a video coding system, the apparatus comprising one or more electronic circuits or processors arranged to:

• determine a Rice parameter for a target transform coefficient based on a local sum of absolute levels of neighboring transform coefficients of the target transform coefficient;
• determine a dependent quantization state;
• determine a zero-position variable based on the dependent quantization state and the Rice parameter;
• and
• parse and decode, from a video bitstream, one or more coded bits associated with a first syntax element for the target transform coefficient in a transform block using one or more codes comprising a Golomb-Rice code with the Rice parameter, wherein the first syntax element corresponds to a modified absolute level value of the target transform coefficient;
• derive an absolute level value of the target transform coefficient according to the zero-position variable and the first syntax element,
• wherein if the first syntax element have a value equal to the zero-position variable, the absolute level value of the target transform coefficient is set to 0.