Improved Quantization and Transform Coefficient Coding for the Emerging Versatile Video Coding (VVC) Standard

Schwarz, Heiko; Nguyễn, Tùng Lâm; Marpe, Detlev; Wiegand, Thomas; Karczewicz, Marta; Coban, Muhammed; Dong, Jie

doi:10.1109/icip.2019.8803768

Cited by 13 publications

(12 citation statements)

References 15 publications

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“…4) Transforms: To reduce signaling costs, the implicit version of the Multiple Transform Selection (MTS) [35] is always used for ISP. Second, the Low Frequency Non-Separable Transform (LFNST) [35] is signaled globally for the whole ISP block, and thus, the same LFNST matrix is utilized for all the subpartitions that have a non-zero Coded Block Flag (CBF) [36]. LFNST can only be used for an ISP-CU if all the subpartitions fulfill the zero-out condition.…”

Section: Originalmentioning

confidence: 99%

Intra Prediction and Mode Coding in VVC

Pfaff

Filippov²,

Liu

et al. 2021

IEEE Trans. Circuits Syst. Video Technol.

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This paper presents the intra prediction and mode coding of the Versatile Video Coding (VVC) standard. This standard was collaboratively developed by the Joint Video Experts Team (JVET). It follows the traditional architecture of a hybrid block-based codec that was also the basis of previous standards. Almost all intra prediction features of VVC either contain substantial modifications in comparison with its predecessor H.265/HEVC or were newly added. The key aspects of these tools are the following: 65 angular intra prediction modes with block shape-adaptive directions and 4-tap interpolation filters are supported as well as the DC and Planar mode, Position Dependent Prediction Combination is applied for most of these modes, Multiple Reference Line Prediction can be used, an intra block can be further subdivided by the Intra Subpartition mode, Matrix-based Intra Prediction is supported, and the chroma prediction signal can be generated by the Cross Component Linear Model method. Finally, the intra prediction mode in VVC is coded separately for luma and chroma. Here, a Most Probable Mode list containing six modes is applied for luma. The individual compression performance of tools is reported in this paper. For the full VVC intra codec, a bitrate saving of 25% on average is reported over H.265/HEVC using an objective metric. Significant subjective benefits are illustrated with specific examples.

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Section: Originalmentioning

confidence: 99%

Intra Prediction and Mode Coding in VVC

Pfaff

Filippov²,

Liu

et al. 2021

IEEE Trans. Circuits Syst. Video Technol.

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“…The main residual coding stage in VVC, informally referred to as regular residual coding (RRC) [24] in the following paragraphs, served as the starting point for the TSRC design. Both TSRC and RRC build upon the concept of 4 × 4 subblocks (SBs) introduced in HEVC for variable transform block sizes [25] and often also referred to as coefficient groups (CGs) [24]. Fig.…”

Section: A Transform Skip Residual Coding (Tsrc)mentioning

confidence: 99%

“…This means that when scanning beyond this last significant scan position along the diagonal scanning pattern towards the end of the block, there are no further significant transform coefficient levels in the block. Note that the value of each of the two variables v X last and v Y last is reconstructed from two syntax elements specifying a prefix and (possibly empty) suffix part of the column or row position of the last significant position (for more details see [24]) .…”

Section: A Transform Skip Residual Coding (Tsrc)mentioning

confidence: 99%

“…2) Level Coding: As in the RRC design [24], the coding and decoding of quantization indices (levels) for TSRC proceeds in several coding passes within an SB, i.e., the parsing process, from a decoder point-of-view, iterates multiple times over each scan position along the scanning pattern within an SB until the decoder can reconstruct the full level information. For TSRC, the levels are coded (and decoded) in three passes, provided that the limit on context-coded bins is not exceeded (see subsection III-A4 below).…”

Section: A Transform Skip Residual Coding (Tsrc)mentioning

confidence: 99%

“…The most prominent difference between the HEVC and VVC binarization process is the parity s par syntax element for TCQ [27], For RRC, when TCQ is enabled, the parity flag drives the TCQ state machine, and its signaling in the first coding pass avoids the requirement for reconstruction of the full level information for each scan position before knowing the TCQ state of the next scan position. Note that the TCQ state is an important element in context modeling of the s sig bin in RRC [24]. From a binarization perspective, each pair of two consecutive absolute levels {(2n, 2n + 1)|n ∈ N + } with different parity shares the same binary codeword representation.…”

Section: A Transform Skip Residual Coding (Tsrc)mentioning

confidence: 99%

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Overview of the Screen Content Support in VVC: Applications, Coding Tools, and Performance

Nguyễn

Henry

et al. 2021

IEEE Trans. Circuits Syst. Video Technol.

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In an increasingly connected world, consumer video experiences have diversified away from traditional broadcast video into new applications with increased use of non-cameracaptured content such as computer screen desktop recordings or animations created by computer rendering, collectively referred to as screen content. There has also been increased use of graphics and character content that is rendered and mixed or overlaid together with camera-generated content. The emerging Versatile Video Coding (VVC) standard, in its first version, addresses this market change by the specification of low-level coding tools suitable for screen content. This is in contrast to its predecessor, the High Efficiency Video Coding (HEVC) standard, where highly efficient screen content support is only available in extension profiles of its version 4. This paper describes the screen content support and the five main low-level screen content coding tools in VVC: transform skip residual coding (TSRC), block-based differential pulse-code modulation (BDPCM), intra block copy (IBC), adaptive color transform (ACT), and the palette mode. The specification of these coding tools in the first version of VVC enables the VVC reference software implementation (VTM) to achieve average bit-rate savings of about 41% to 61% relative to the HEVC test model (HM) reference software implementation using the Main 10 profile for 4:2:0 screen content test sequences. Compared to the HM using the Screen-Extended Main 10 profile and the same 4:2:0 test sequences, the VTM provides about 19% to 25% bit-rate savings. The same comparison with 4:4:4 test sequences revealed bit-rate savings of about 13% to 27% for Y CBCR and of about 6% to 14% for R G B screen content. Relative to the HM without the HEVC version 4 screen content coding extensions, the bit-rate savings for 4:4:4 test sequences are about 33% to 64% for Y CBCR and 43% to 66% for R G B screen content.

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