High throughput binarization (HTB) method for CABAC in HEVC
Provided is an electronic device configured for high throughput binarization mode. The electronic device includes a processor and instructions stored in memory that is in electronic communication with the processor. The electronic device obtains a block of transformed and quantized coefficients (TCQs). The electronic device determines whether a high throughput binarization mode condition is met. If the condition is met, the electronic device uses the high throughput binarization mode to process the block. If the condition is not met, the electronic device does not use the high throughput binarization mode to process the block. The electronic device transmits the generated first or second bitstream to a decoder.
1. A method for decoding a bit stream associated with transform coefficients comprising:
obtaining a bit steam; and
determining whether to decode level information of a 4×4 block of a block from the bit stream using: a high throughput binarization mode and a bypass decoding mode, or selectively using a regular decoding mode and the bypass decoding mode, based on a value of a high throughput binarizaiton mode indicator in a header that is contained in the bit stream and corresponding to the 4×4 block,
in response to determining that the value of the high throughput binarizaiton mode indicator is a first value, decoding a binary symbol corresponding to the 4×4 block from the bit stream by using the bypass decoding mode, de-binarizing the bypass decoded binary symbol by using the high throughput binarizaiton mode to obtain an input value, and deriving a sign and level information of the 4×4 block by mapping the obtained input value using a mapping table predefined;
in response to determining that the value of the high throughput binarizaiton mode indicator is a second value that is different from the first value, decoding level information of the 4×4 block from the bit steam by selectively using the regular decoding mode and the bypass decoding mode.
2. The method of claim 1 , wherein the high throughput binarizaiton is selected from a group of binarization tables based on the obtained input value.
3. The method of claim 2 , wherein the binarizaiton tables are Variable Length Coding (VLC) tables of Context Adaptive Variable Length Coding (CAVLC).
4. The method of claim 2 , further comprising:
determining whether the obtained input value is greater than a preset threshold; and
updating the binarization tables responsive to determining that the obtained input value is greater than the preset threshold.
5. The method of claim 2 , wherein, the header is slice header.
6. The method of claim 2 , wherein, the value of the high throughput binarization mode indicator is set to the first value at an encoding side when:
a characteristic corresponding to the 4×4 block is greater than a preset threshold; or
the slice level of the 4×4 block is greater than a preset threshold; or
the transform unit of the 4×4 block is greater than a preset threshold.