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US 12,335,527 B2Granted
Transform-skip residual coding of video data
AssigneeAlibaba Group Holding Limited
InventorsMohammed Golam Sarwer, Yan Ye, Jiancong Luo
Life of this patent
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Abstract
The present disclosure provides systems and methods for transform-skip residual video data coding and decoding. One exemplary method comprises: performing a first pass of scanning a transform coefficient of a sub-block of a video frame, wherein the first pass of scanning comprises: bypass coding a parity level flag for the transform coefficient, the parity level flag indicating a parity of an absolute value of a level of the transform coefficient.
Claims20
A coding method implemented by an encoder of video data, the method comprising:
- performing a first pass of scanning a plurality of transform coefficients of a sub-block of a video frame, wherein coding of the sub-block is executed by multiple passes of scanning of the sub-block including the first pass of scanning and a second pass of scanning, the first pass of scanning comprising:
- determining whether a remaining number of context coded bins (MaxCcbs) being greater than or equal to 4;
- and
- in response to the remaining number of context coded bins being greater than or equal to 4, performing:
- coding a sig_coeff_flag for a current transform coefficient, the sig_coeff_flag indicating whether a level of the current transform coefficient is zero;
- and
- in response to the level of the current transform coefficient being not zero, coding a coeff_sign_flag and an abs_level_gtx_flag[0] for the current transform coefficient, the coeff_sign_flag representing the sign of the level of the current transform coefficient and the abs_level_gtx_flag[0] representing the absolute value of the level of the current transform coefficient is greater than 1;
- and
- performing the second pass of scanning the plurality of transform coefficients of the sub-block of the video frame, the second pass of scanning comprising:
- in response to the abs_level_gtx_flag[0] for the current transform coefficient being equal to 1, coding an abs_level_gtx_flag[1] for the current transform coefficient, the abs_level_gtx_flag[1] indicating whether the absolute value of the level of the current transform coefficient is greater than 3;
- in response to the abs_level_gtx_flag[1] for the current transform coefficient being equal to 1, coding an abs_level_gtx_flag[2] for the current transform coefficient, the abs_level_gtx_flag[2] indicating whether the absolute value of the level of the current transform coefficient is greater than 5;
- in response to the abs_level_gtx_flag[2] for the current transform coefficient being equal to 1, coding an abs_level_gtx_flag[3] for the current transform coefficient, the abs_level_gtx_flag[3] indicating whether the absolute value of the level of the current transform coefficient is greater than 7;
- and
- in response to the abs_level_gtx_flag[3] for the current transform coefficient being equal to 1, coding an abs_level_gtx_flag[4] for the current transform coefficient, the abs_level_gtx_flag[4] indicating whether the absolute value of the level of the current transform coefficient is greater than 9.
11 more elements
A system to encode video data, the system comprising:
- at least one memory for storing instructions;
- and
- at least one processor configured to execute the instructions to cause the apparatus to perform operations comprising:
- performing a first pass of scanning a plurality of transform coefficients of a sub-block of a video frame, wherein coding of the sub-block is executed by multiple passes of scanning of the sub-block including the first pass of scanning and a second pass of scanning, the first pass of scanning comprising:
- determining whether a remaining number of context coded bins (MaxCcbs) being greater than or equal to 4;
- and
- in response to the remaining number of context coded bins being greater than or equal to 4, performing:
- coding a sig_coeff_flag for a current transform coefficient, the sig_coeff_flag indicating whether a level of the current transform coefficient is zero;
- and
- in response to the level of the current transform coefficient being not zero, coding a coeff_sign_flag and an abs_level_gtx_flag[0] for the current transform coefficient, the coeff_sign_flag representing the sign of the level of the current transform coefficient and the abs_level_gtx_flag[0] representing the absolute value of the level of the current transform coefficient is greater than 1;
- and
- performing the second pass of scanning the plurality of transform coefficients of the sub-block of the video frame, the second pass of scanning comprising:
- in response to the abs_level_gtx_flag[0] for the current transform coefficient being equal to 1, coding an abs_level_gtx_flag[1] for the current transform coefficient, the abs_level_gtx_flag[1] indicating whether the absolute value of the level of the current transform coefficient is greater than 3;
- in response to the abs_level_gtx_flag[1] for the current transform coefficient being equal to 1, coding an abs_level_gtx_flag[2] for the current transform coefficient, the abs_level_gtx_flag[2] indicating whether the absolute value of the level of the current transform coefficient is greater than 5;
- in response to the abs_level_gtx_flag[2] for the current transform coefficient being equal to 1, coding an abs_level_gtx_flag[3] for the current transform coefficient, the abs_level_gtx_flag[3] indicating whether the absolute value of the level of the current transform coefficient is greater than 7;
- and
- in response to the abs_level_gtx_flag[3] for the current transform coefficient being equal to 1, coding an abs_level_gtx_flag[4] for the current transform coefficient, the abs_level_gtx_flag[4] indicating whether the absolute value of the level of the current transform coefficient is greater than 9.
14 more elements
A non-transitory computer readable storage medium storing a bitstream of video data for processing according to a method comprising:
- performing a first pass of scanning a plurality of transform coefficients of a sub-block of a video frame, wherein decoding of the sub-block is executed by multiple passes of scanning of the sub-block including the first pass of scanning and a second pass of scanning, the first pass of scanning comprising:
- determining whether a remaining number of context coded bins (MaxCcbs) being greater than or equal to 4;
- and
- in response to the remaining number of context coded bins being greater than or equal to 4, performing:
- decoding a sig_coeff_flag for a current transform coefficient, the sig_coeff_flag indicating whether a level of the current transform coefficient is zero;
- and
- in response to the level of the current transform coefficient being not zero, decoding a coeff_sign_flag and an abs_level_gtx_flag[0] for the current transform coefficient, the coeff_sign_flag representing the sign of the level of the current transform coefficient and the abs_level_gtx_flag[0] representing the absolute value of the level of the current transform coefficient is greater than 1;
- and
- performing the second pass of scanning the plurality of transform coefficients of the sub-block of the video frame, the second pass of scanning comprising:
- in response to the abs_level_gtx_flag[0] for the current transform coefficient being equal to 1, decoding an abs_level_gtx_flag[1] for the current transform coefficient, the abs_level_gtx_flag[1] indicating whether the absolute value of the level of the current transform coefficient is greater than 3;
- in response to the abs_level_gtx_flag[1] for the current transform coefficient being equal to 1, decoding an abs_level_gtx_flag[2] for the current transform coefficient, the abs_level_gtx_flag[2] indicating whether the absolute value of the level of the current transform coefficient is greater than 5;
- in response to the abs_level_gtx_flag[2] for the current transform coefficient being equal to 1, decoding an abs_level_gtx_flag[3] for the current transform coefficient, the abs_level_gtx_flag[3] indicating whether the absolute value of the level of the current transform coefficient is greater than 7;
- and
- in response to the abs_level_gtx_flag[3] for the current transform coefficient being equal to 1, decoding an abs_level_gtx_flag[4] for the current transform coefficient, the abs_level_gtx_flag[4] indicating whether the absolute value of the level of the current transform coefficient is greater than 9.
11 more elements
A system to decode video data, the system comprising:
- at least one memory for storing instructions;
- and
- at least one processor configured to execute the instructions to cause the apparatus to perform operations comprising:
- performing a first pass of scanning a plurality of transform coefficients of a sub-block of a video frame, wherein decoding of the sub-block is executed by multiple passes of scanning of the sub-block including the first pass of scanning and a second pass of scanning, the first pass of scanning comprising:
- determining whether a remaining number of context coded bins (MaxCcbs) being greater than or equal to 4;
- and
- in response to the remaining number of context coded bins being greater than or equal to 4, performing:
- decoding a sig_coeff_flag for a current transform coefficient, the sig_coeff_flag indicating whether a level of the current transform coefficient is zero;
- and
- in response to the level of the current transform coefficient being not zero, decoding a coeff_sign_flag and an abs_level_gtx_flag[0] for the current transform coefficient, the coeff_sign_flag representing the sign of the level of the current transform coefficient and the abs_level_gtx_flag[0] representing the absolute value of the level of the current transform coefficient is greater than 1;
- and
- performing the second pass of scanning the plurality of transform coefficients of the sub-block of the video frame, the second pass of scanning comprising:
- in response to the abs_level_gtx_flag[0] for the current transform coefficient being equal to 1, decoding an abs_level_gtx_flag[1] for the current transform coefficient, the abs_level_gtx_flag[1] indicating whether the absolute value of the level of the current transform coefficient is greater than 3;
- in response to the abs_level_gtx_flag[1] for the current transform coefficient being equal to 1, decoding an abs_level_gtx_flag[2] for the current transform coefficient, the abs_level_gtx_flag[2] indicating whether the absolute value of the level of the current transform coefficient is greater than 5;
- in response to the abs_level_gtx_flag[2] for the current transform coefficient being equal to 1, decoding an abs_level_gtx_flag[3] for the current transform coefficient, the abs_level_gtx_flag[3] indicating whether the absolute value of the level of the current transform coefficient is greater than 7;
- and
- in response to the abs_level_gtx_flag[3] for the current transform coefficient being equal to 1, decoding an abs_level_gtx_flag[4] for the current transform coefficient, the abs_level_gtx_flag[4] indicating whether the absolute value of the level of the current transform coefficient is greater than 9.
14 more elements
Dependencies are inferred from the claim text.