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12th Meeting: Macao, October 2018 2018-10-03 06:53
CE5.2.2: CABAC range sub-interval derivation
Abstract
In JEM CABAC engine, the rangeLPS is derived by using a 512×64×9-bit look-up table, where the size of the rangeLPS look-up table is 144 times of that in HEVC. In CE5.2.2, two alternative rangeLPS derivation methods are proposed. Each of the two methods can be implemented with a look-up table or a multiplier. For both methods, the size of the table for deriving the rangeLPS value is the same as that in HEVC, i.e., 32×8×8 bits, but the tables of the two methods are different. In CE5.2.2.a, the table look-up values are calculated by using a 6-bit by 5-bit multiplier. In CE5.2.2.b, the table look-up values are calculated by using a 6-bit by 4-bit multiplier. Simulation results reportedly show that, compared with using the 512×64×9-bit look-up table, the average luma BD-rate increases are less than 0.00% and 0.06% for CE5.2.2.a and CE5.2.2.b, respectively, on CEM1 software. Results of using a 16×8×8-bit look-up table or a 5-bit by 5-bit multiplier in CE5.2.2.a and results of using a 16×8×8-bit look-up table or a 5-bit by 4-bit multiplier in CE5.2.2.b are also reported as follows. Compared with using the 512×64×9-bits look up table, the average luma BD-rate increases are less than 0.17% and 0.22% for CE5.2.2.a and CE5.2.2.b, respectively, on CEM1 software.
JVET-L0094 CE5.2.2: CABAC range sub-interval derivation [T.-D. Chuang, C.-Y. Chen, Y.-W. Huang, S.-M. Lei (MediaTek)]
References:
JVET-K1025
Decisions
JVET-L0094 CE5.2.2: CABAC range sub-interval derivation [T.-D. Chuang, C.-Y. Chen, Y.-W. Huang, S.-M. Lei (MediaTek)]
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