Golomb-rice/eg coding technique for CABAC in HEVC
A system utilizing a high throughput coding mode for CABAC in HEVC is described. The system may include an electronic device configured to obtain a block of data to be encoded using an arithmetic based encoder; to generate a sequence of syntax elements using the obtained block; to compare an Absolute-3 value of the sequence or a parameter associated with the Absolute-3 value to a preset value; and to convert the Absolute-3 value to a codeword using a first code or a second code that is different than the first code, according to a result of the comparison.
1. A method of transmitting encoded transform coefficients of a block of an image, the method comprising:
obtaining a transform coefficient to be encoded;
generating a plurality of flags indicating whether the transform coefficient is greater than a particular value;
generating a syntax element wherein a combination of the plurality of flags and the syntax element indicates a magnitude of the transform coefficient, wherein at least one of the flags indicates whether an amplitude of the transform coefficient is greater than one;
determining a Rice code with an associated Rice parameter;
determining whether to use a first code or a second code in combination with the Rice code for encoding the syntax element using arithmetic coding, wherein the first code is a k-th order exponential Golomb code;
generating an indicator which indicates whether the first code or the second code is used in combination with the Rice code, wherein the indicator is a flag that is different from the Rice parameter;
encoding the syntax element using the Rice code in combination with either the first code or the second code, as indicated by the indicator;
transmitting the indicator; and
transmitting the encoded syntax element.
2. The method of claim 1 , wherein the value k of the k-th order exponential Golomb code is determined based on the Rice parameter.
3. A non-transitory computer-readable medium storing encoded image data, the encoded image data configured to be processed by one or more processing devices, the encoded image data comprising:
a plurality of flags indicating whether a transform coefficient of a block in the encoded image is greater than a particular value, wherein at least one of the flags indicates whether an amplitude of the transform coefficient is greater than one;
a syntax element, wherein a combination of the plurality of flags and the syntax element indicates a magnitude of the transform coefficient, wherein the syntax element is encoded by arithmetic coding using a Rice code having an associated Rice parameter;
an indicator indicating whether a first code or a second code is to be used in combination with the Rice code in decoding the syntax element, wherein the indicator is a flag that is different from the Rice parameter;
wherein the first code is a k-th order exponential Golomb code.
4. The non-transitory computer-readable medium of claim 3 , wherein the value k of the k-th order exponential Golomb code is determined based on the Rice parameter.