Temporal dependency based Lagrange multiplier adaptation for HEVC

Guo, Hongwei; Zhu, Ce; Liu, Yuyang; Ye, Mao; Luo, Lei

doi:10.1109/bmsb49480.2020.9379711

Cited by 2 publications

(8 citation statements)

References 13 publications

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“…Therefore, the equation ( 25) can be solved by the RTE method to obtain the value of λg. Then the Lagrange multiplier for all CTUs can be calculated by (23).…”

Section: ) Performing Second Encodingmentioning

confidence: 99%

“…Specifically, the multiple QP optimization with 5 QP candidates is referred to as MQP-5 [16]. the temporal dependency based Lagrange multiplier adaptation, which is our previous work, is referred to as TD-LMA [23]. The temporal dependent rate-distortion optimization for low-delay hierarchical video coding, which was shifted from HM13.0 to HM16.7 by us, is referred to as TD-RDO [25].…”

Section: A Simulation Setupmentioning

confidence: 99%

“…Calculating λi and QPi via ( 23) and ( 26). TD-LMA [23] TD-RDO [25] λ-OBA [34] OBA-F [35] Proposed The simulation environment is set as suggested by the CTC [39], and the LDB and LDP configurations were tested. The test sequences are all the 16 video sequences from the Classes B, C, D, and E suggested by the CTC, with varying resolutions and motion characteristics.…”

Section: : For I ← 1 To N Domentioning

confidence: 99%

“…According to the CTC, each video sequence was encoded four times with four bit rate points by a method, respectively. Specifically, the original HM16.7, the proposed method, the MQP-5 [16], the TD-LMA [23], and the TD-RDO [25] set the input QP as 22, 27,32, and 37. The λ-OBA [34] and the OBA-F [35] set the target bit rate as the four bit rates generated by the original HM16.7 with four different input QPs (22,27,32,37).…”

Section: : For I ← 1 To N Domentioning

confidence: 99%

“…In [22], a temporal dependence based RDO method is proposed for HEVC under the LD configuration, where the optimal Lagrange multiplier is estimated by adaptively selecting the scaling factor according to the video motion characteristics at different temporal layers. By only considering the direct distortion propagation, Guo et al [23] proposed a Lagrange multiplier adaptation method based on pre-encoding for HEVC under the LD configuration. Based on a source distortion temporal propagation (SDTP) model [24], Gao et al proposed a temporally dependent RDO (TD-RDO) for HEVC under the LD configuration [25], and a layer-based TD-RDO method under the RA configuration [26], respectively.…”

Section: Introductionmentioning

confidence: 99%

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Rate-Distortion Optimization Based on Two-Pass Encoding for HEVC

et al. 2021

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Rate-distortion optimization (RDO) is a crucial technique in block-based hybrid video encoders, which determines the coding option for a certain coding unit to achieve optimal rate-distortion (R-D) performance. However, the current RDO, which is implemented into High Efficiency Video Coding (HEVC) test model, i.e., HM, is far from being global optimal as it ignores the interaction among coding options. Recent studies have shown that the dependent RDO methods can improve the coding efficiency of encoders by exploring the R-D dependency among coding units, but these methods do not consider the R-D characteristics of coding units. In this paper, we proposed a two-pass encoding based RDO method, which combines both the R-D dependency and R-D characteristics, to further improve the coding efficiency. First, a frame is encoded with the original HEVC scheme to obtain the R-D model of coding tree units (CTU) and the bit budget of the frame. Second, an optimal equation combines the R-D model and R-D dependency is established to adaptively determine the Lagrange multiplier and quantization parameter (QP) for each CTU. Finally, the current frame is encoded with a new scheme again. Experimental results show that compared with the original HM, the proposed method obtains R-D performance improvements of 5.3% and 5.6% on average under configurations of low-delay B and P frames, respectively.INDEX TERMS Rate-distortion optimization, high efficiency video coding, adaptive Lagrange multiplier, rate-distortion model, temporal dependency.

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“…Therefore, the equation ( 25) can be solved by the RTE method to obtain the value of λg. Then the Lagrange multiplier for all CTUs can be calculated by (23).…”

Section: ) Performing Second Encodingmentioning

confidence: 99%

Section: A Simulation Setupmentioning

confidence: 99%