US20220272347A1 - Joint coding of chroma residual and filtering in video processing - Google Patents

Joint coding of chroma residual and filtering in video processing Download PDF

Info

Publication number
US20220272347A1
US20220272347A1 US17/720,582 US202217720582A US2022272347A1 US 20220272347 A1 US20220272347 A1 US 20220272347A1 US 202217720582 A US202217720582 A US 202217720582A US 2022272347 A1 US2022272347 A1 US 2022272347A1
Authority
US
United States
Prior art keywords
quantization parameter
chroma
cbcr
offset
equal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
US17/720,582
Other languages
English (en)
Inventor
Weijia Zhu
Li Zhang
Jizheng Xu
Kai Zhang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ByteDance Inc
Original Assignee
ByteDance Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ByteDance Inc filed Critical ByteDance Inc
Assigned to BYTEDANCE INC. reassignment BYTEDANCE INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: XU, JIZHENG, ZHANG, KAI, ZHANG, LI, ZHU, WEIJIA
Publication of US20220272347A1 publication Critical patent/US20220272347A1/en
Priority to US18/519,994 priority Critical patent/US20240107038A1/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/117—Filters, e.g. for pre-processing or post-processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/119—Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/12—Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • H04N19/126—Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/132—Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/167—Position within a video image, e.g. region of interest [ROI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
    • H04N19/86—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving reduction of coding artifacts, e.g. of blockiness

Definitions

  • This patent document relates to video coding techniques, devices and systems.
  • Devices, systems and methods related to digital video coding, and specifically, to management of motion vectors are described.
  • the described methods may be applied to existing video coding standards (e.g., High Efficiency Video Coding (HEVC) or Versatile Video Coding) and future video coding standards or video codecs.
  • HEVC High Efficiency Video Coding
  • Versatile Video Coding future video coding standards or video codecs.
  • the disclosed technology may be used to provide a method for video processing.
  • This method includes determining, for a conversion between a chroma block of a video and a bitstream representation of the video, applicability of a deblocking filter process to at least some samples at an edge of the chroma block based on a mode of joint coding of chroma residuals for the chroma block.
  • the method also includes performing the conversion based on the determining.
  • the disclosed technology may be used to provide a method for video processing.
  • This method includes determining, for a conversion between a current block of a video and a bitstream representation of the video, a chroma quantization parameter used in a deblocking filtering process applied to at least some samples at an edge of the current block based on information of a corresponding transform block of the current block.
  • the method also includes performing the conversion based on the determining.
  • the disclosed technology may be used to provide a method for video processing.
  • This method includes performing a conversion between a current block of a video and a bitstream representation of the video.
  • a first chroma quantization parameter used in a deblocking filtering process applied to at least some samples along an edge of the current block is based on a second chroma quantization parameter used in a scaling process and a quantization parameter offset associated with a bit depth.
  • the disclosed technology may be used to provide a method for video processing.
  • This method includes performing a conversion between a video comprising one or more coding units and a bitstream representation of the video.
  • the bitstream representation conforms to a format rule that specifies that chroma quantization parameters are included in the bitstream representation at a coding unit level or a transform unit level according to The format rule.
  • the disclosed technology may be used to provide a method for video processing.
  • This method includes performing a conversion between a block of a video and a bitstream representation of the video.
  • the bitstream representation conforms to a format rule specifying that whether a joint coding of chroma residuals mode is applicable to the block is indicated at a coding unit level in the bitstream representation.
  • the disclosed technology may be used to provide a method for video processing.
  • This method includes performing a conversion between a video unit and a coded representation of the video unit, wherein, during the conversion, a deblocking filter is used on boundaries of the video unit such that when a chroma quantization parameter (QP) table is used to derive parameters of the deblocking filter, processing by the chroma QP table is performed on individual chroma QP values.
  • QP chroma quantization parameter
  • the disclosed technology may be used to provide another method for video processing.
  • This method includes performing a conversion between a video unit and a bitstream representation of the video unit, wherein, during the conversion, a deblocking filter is used on boundaries of the video unit such that chroma QP offsets are used in the deblocking filter, wherein the chroma QP offsets are at picture/slice/tile/brick/subpicture level.
  • the disclosed technology may be used to provide another method for video processing.
  • This method includes performing a conversion between a video unit and a bitstream representation of the video unit, wherein, during the conversion, a deblocking filter is used on boundaries of the video unit such that chroma QP offsets are used in the deblocking filter, wherein information pertaining to a same luma coding unit is used in the deblocking filter and for deriving a chroma QP offset.
  • the disclosed technology may be used to provide another method for video processing.
  • This method includes performing a conversion between a video unit and a bitstream representation of the video unit, wherein, during the conversion, a deblocking filter is used on boundaries of the video unit such that chroma QP offsets are used in the deblocking filter, wherein an indication of enabling usage of the chroma QP offsets is signaled in the bitstream representation.
  • the disclosed technology may be used to provide another method for video processing.
  • This method includes performing a conversion between a video unit and a bitstream representation of the video unit, wherein, during the conversion, a deblocking filter is used on boundaries of the video unit such that chroma QP offsets are used in the deblocking filter, wherein the chroma QP offsets used in the deblocking filter are identical of whether JCCR coding method is applied on a boundary of the video unit or a method different from the JCCR coding method is applied on the boundary of the video unit.
  • the disclosed technology may be used to provide another method for video processing.
  • This method includes performing a conversion between a video unit and a bitstream representation of the video unit, wherein, during the conversion, a deblocking filter is used on boundaries of the video unit such that chroma QP offsets are used in the deblocking filter, wherein a boundary strength (BS) of the deblocking filter is calculated without comparing reference pictures and/or a number of motion vectors (MVs) associated with the video unit at a P side boundary with reference pictures of the video unit at a Q side boundary.
  • BS boundary strength
  • an apparatus in a video system comprising a processor and a non-transitory memory with instructions thereon is disclosed.
  • a video decoding apparatus comprising a processor configured to implement any one or more of the disclosed methods.
  • a video encoding apparatus comprising a processor configured to implement any one or more of the disclosed methods.
  • a computer program product stored on a non-transitory computer readable media, the computer program product including program code for carrying out any one or more of the disclosed methods is disclosed.
  • FIG. 1 shows an example of an overall processing flow of a blocking deblocking filter process.
  • FIG. 2 shows an example of a flow diagram of a Bs calculation.
  • FIG. 3 shows an example of a referred information for Bs calculation at CTU boundary.
  • FIG. 4 shows an example of pixels involved in filter on/off decision and strong/weak filter selection.
  • FIG. 5 shows an example of an overall processing flow of deblocking filter process in VVC.
  • FIG. 6 shows an example of a luma deblocking filter process in VVC.
  • FIG. 7 shows an example of a chroma deblocking filter process in VVC
  • FIG. 8 shows an example of a filter length determination for sub PU boundaries.
  • FIG. 9A shows an example of center positions of a chroma block.
  • FIG. 9B shows another example of center positions of a chroma block.
  • FIG. 10 shows examples of blocks at P side and Q side.
  • FIG. 11 shows examples of usage of a luma block's decoded information.
  • FIG. 12 is a block diagram of an example of a hardware platform for implementing a visual media decoding or a visual media encoding technique described in the present document.
  • FIG. 13 shows a flowchart of an example method for video coding.
  • FIG. 14A shows an example of Placement of CC-ALF with respect to other loop filters (b) Diamond shaped filter.
  • FIG. 14B shows an example of Placement of CC-ALF with respect to Diamond shaped filter.
  • FIG. 15 is a block diagram that illustrates an example video coding system.
  • FIG. 16 is a block diagram that illustrates an encoder in accordance with some embodiments of the present disclosure.
  • FIG. 17 is a block diagram that illustrates a decoder in accordance with some embodiments of the present disclosure.
  • FIG. 18 is a block diagram of an example video processing system in which disclosed techniques may be implemented.
  • FIG. 19 is a flowchart representation of a method for video processing in accordance with the present technology.
  • FIG. 20 is a flowchart representation of another method for video processing in accordance with the present technology.
  • FIG. 21 is a flowchart representation of another method for video processing in accordance with the present technology.
  • FIG. 22 is a flowchart representation of another method for video processing in accordance with the present technology.
  • FIG. 23 is a flowchart representation of yet another method for video processing in accordance with the present technology.
  • Video coding standards have evolved primarily through the development of the well-known ITU-T and ISO/IEC standards.
  • the ITU-T produced H.261 and H.263, ISO/IEC produced MPEG-1 and MPEG-4 Visual, and the two organizations jointly produced the H.262/MPEG-2 Video and H.264/MPEG-4 Advanced Video Coding (AVC) and H.265/HEVC standards.
  • AVC H.264/MPEG-4 Advanced Video Coding
  • H.265/HEVC H.265/HEVC
  • the video coding standards are based on the hybrid video coding structure wherein temporal prediction plus transform coding are utilized.
  • Joint Video Exploration Team JVET was founded by VCEG and MPEG jointly in 2015. Since then, many new methods have been adopted by JVET and put into the reference software named Joint Exploration Model (JEM).
  • JEM Joint Exploration Model
  • a deblocking filter process is performed for each CU in the same order as the decoding process. First, vertical edges are filtered (horizontal filtering), then horizontal edges are filtered (vertical filtering). Filtering is applied to 8 ⁇ 8 block boundaries which are determined to be filtered, for both luma and chroma components. 4 ⁇ 4 block boundaries are not processed in order to reduce the complexity.
  • FIG. 1 illustrates the overall processing flow of deblocking filter process.
  • a boundary can have three filtering status: no filtering, weak filtering and strong filtering.
  • Each filtering decision is based on boundary strength, Bs, and threshold values, ⁇ and t C .
  • CU boundary which are outer edges of CU, are always involved in the filtering since CU boundaries are always also TU boundary or PU boundary.
  • PU shape 2N ⁇ N (N>4) and RQT depth is equal to 1
  • TU boundary at 8 ⁇ 8 block grid and PU boundary between each PU inside CU are involved in the filtering.
  • RQT depth is equal to 1
  • TU boundary at 8 ⁇ 8 block grid and PU boundary between each PU inside CU are involved in the filtering.
  • the boundary is not filtered.
  • boundary strength reflects how strong filtering is needed for the boundary. If Bs is large, strong filtering should be considered.
  • FIG. 2 illustrates how the Bs value is calculated based on the intra coding mode, existence of non-zero transform coefficients and motion information, reference picture, number of motion vectors and motion vector difference.
  • Bs is calculated on a 4 ⁇ 4 block basis, but it is re-mapped to an 8 ⁇ 8 grid.
  • the maximum of the two values of Bs which correspond to 8 pixels consisting of a line in the 4 ⁇ 4 grid is selected as the Bs for boundaries in the 8 ⁇ 8 grid.
  • Threshold values ⁇ and t C which involving in filter on/off decision, strong and weak filter selection and weak filtering process are derived based on luma quantization parameter of P and Q blocks, QP P and QP Q , respectively.
  • Q used to derive ⁇ and t C is calculated as follows.
  • variable ⁇ is derived as shown in Table 1, based on Q. If Bs is greater than 1, the variable t C is specified as Table 1 with Clip3(0, 55, Q+2) as input. Otherwise (BS is equal or less than 1), the variable t C is specified as Table 1 with Q as input.
  • Filter on/off decision is done for four lines as a unit.
  • FIG. 4 illustrates the pixels involving in filter on/off decision.
  • the 6 pixels in the two red boxes for the first four lines are used to determine filter on/off for 4 lines.
  • the 6 pixels in two red boxes for the second 4 lines are used to determine filter on/off for the second four lines.
  • dE, dEp1 and dEp2 are derived for weak filtering process.
  • the variable dE is set equal to 1. If dp0+dp3 ⁇ +( ⁇ >>1))>>3, the variable dEp1 is set equal to 1. If dq0+dq3 ⁇ ( ⁇ ( ⁇ >>1))>>3, the variable dEq1 is set equal to 1.
  • strong filter is used for filtering of the second 4 lines. Otherwise, weak filter is used for filtering.
  • filtered pixel values are obtained by following equations. It is worth to note that three pixels are modified using four pixels as an input for each P and Q block, respectively.
  • Bs of chroma filtering is inherited from luma. If Bs>1 or if coded chroma coefficient existing case, chroma filtering is performed. No other filtering decision is there. And only one filter is applied for chroma. No filter selection process for chroma is used.
  • the filtered sample values p 0 ′ and q 0 ′ are derived as follows.
  • deblocking filtering process is mostly the same to those in HEVC. However, the following modifications are added.
  • FIG. 5 depicts a flowchart of deblocking filters process in VVC for a coding unit.
  • the filter strength of the deblocking filter is controlled by the variables ⁇ and t C which are derived from the averaged quantization parameters qP L .
  • deblocking filter controls the strength of the deblocking filter by adding offset to qP L according to the luma level of the reconstructed samples if the SPS flag of this method is true.
  • the reconstructed luma level LL is derived as follow:
  • LL is used to decide the offset qpOffset based on the threshold signaled in SPS.
  • the qP L which is derived as follows, is employed to derive the ⁇ and t C
  • Qp Q and Qp P denote the quantization parameters of the coding units containing the sample q 0,0 and p 0,0 , respectively.
  • this method is only applied on the luma deblocking process.
  • HEVC uses an 8 ⁇ 8 deblocking grid for both luma and chroma.
  • deblocking on a 4 ⁇ 4 grid for luma boundaries was introduced to handle blocking artifacts from rectangular transform shapes.
  • Parallel friendly luma deblocking on a 4 ⁇ 4 grid is achieved by restricting the number of samples to be deblocked to 1 sample on each side of a vertical luma boundary where one side has a width of 4 or less or to 1 sample on each side of a horizontal luma boundary where one side has a height of 4 or less.
  • Both P and Q have two MVs pointing to the same ref pictures, and both of the following two conditions are satisfied:
  • the determination of whether the reference pictures used for the two coding sublocks are the same or different is based only on whichpictures are referenced, without regard to whether a prediction is formed using an index into reference picture list 0 or an index into reference picture list 1, and also without regard
  • the proposal uses a bilinear filter when samples at either one side of a boundary belong to a large block.
  • the bilinear filter is listed below.
  • tcPD i and tcPD j term is a position dependent clipping described in Section 2.2.5 and g j , ⁇ i , Middle s,t , P s and Q s are given below:
  • Wider-stronger luma filter is filters are used only if all of the Condition 1, Condition 2 and Condition 3 are TRUE.
  • the condition 1 is the “large block condition”. This condition detects whether the samples at P-side and Q-side belong to large blocks, which are represented by the variable bSidePisLargeBlk and bSideQisLargeBlk respectively.
  • the bSidePisLargeBlk and bSideQisLargeBlk are defined as follows.
  • condition 1 Based on bSidePisLargeBlk and bSideQisLargeBlk, the condition 1 is defined as follows.
  • dp0, dp3, dq0, dq3 are first derived as in HEVC if (p side is greater than or equal to 32)
  • d ⁇ p ⁇ 0 ( d ⁇ ⁇ p ⁇ ⁇ 0 + Abs ⁇ ( p 5 , 0 - 2 * ⁇ p 4 , 0 + p 3 , 0 ) + 1 ) ⁇ 1
  • d ⁇ ⁇ p ⁇ ⁇ 3 ( d ⁇ ⁇ p ⁇ ⁇ 3 + Abs ⁇ ( p 5 , 3 - 2 * ⁇ p 4 , 3 + p 3 , 3 ) + 1 ) ⁇ 1
  • dpq0, dpq3, dp, dq, d are then derived as in HEVC.
  • condition 2 is defined as follows.
  • condition 3 the large block Strong filter condition
  • dpq is derived as in HEVC.
  • StrongFilterCondition (dpq is less than ( ⁇ >>2), sp3+sq3 is less than (3* ⁇ >>5), and Abs (p0 ⁇ q0) is less than (5*t C +1)>>1)?TRUE:FALSE
  • FIG. 6 depicts the flowchart of luma deblocking filter process.
  • the proposed chroma filter performs deblocking on a 4 ⁇ 4 chroma sample grid.
  • the above chroma filter performs deblocking on a 8 ⁇ 8 chroma sample grid.
  • the chroma strong filters are used on both sides of the block boundary.
  • the chroma filter is selected when both sides of the chroma edge are greater than or equal to 8 (in unit of chroma sample), and the following decision with three conditions are satisfied.
  • the first one is for decision of boundary strength as well as large block.
  • the second and third one are basically the same as for HEVC luma decision, which are on/off decision and strong filter decision, respectively.
  • FIG. 7 depicts the flowchart of chroma deblocking filter process.
  • the proposal also introduces a position dependent clipping tcPD which is applied to the output samples of the luma filtering process involving strong and long filters that are modifying 7, 5 and 3 samples at the boundary. Assuming quantization error distribution, it is proposed to increase clipping value for samples which are expected to have higher quantization noise, thus expected to have higher deviation of the reconstructed sample value from the true sample value.
  • position dependent threshold table is selected from Tc7 and Tc3 tables that are provided to decoder as a side information:
  • T ⁇ c ⁇ 7 ⁇ 6 , 5 , 4 , 3 , 2 , 1 , 1 ⁇ ;
  • T ⁇ ⁇ c ⁇ ⁇ 3 ⁇ 6 , 4 , 2 ⁇ ;
  • position dependent threshold For the P or Q boundaries being filtered with a short symmetrical filter, position dependent threshold of lower magnitude is applied:
  • T ⁇ c ⁇ 3 ⁇ 3 , 2 , 1 ⁇ ;
  • filtered p′i and q′i sample values are clipped according to tcP and tcQ clipping values:
  • p ′′ i clip ⁇ ⁇ 3 ⁇ ( p ′ i ⁇ + t ⁇ ⁇ c ⁇ ⁇ P i , p ′ i - t ⁇ ⁇ c ⁇ ⁇ P i , p ′ i ) ;
  • q ′′ j clip ⁇ ⁇ 3 ⁇ ( q ′ j + t ⁇ c ⁇ Q j , q ′ j - t ⁇ c ⁇ Q j , q ′ j ) ;
  • Term clip3 is a clipping function as it is specified in VVC.
  • the long filters is restricted to modify at most 5 samples on a side that uses sub-block deblocking (AFFINE or ATMVP) as shown in the luma control for long filters. Additionally, the sub-block deblocking is adjusted such that that sub-block boundaries on an 8 ⁇ 8 grid that are close to a CU or an implicit TU boundary is restricted to modify at most two samples on each side.
  • AFFINE or ATMVP sub-block deblocking
  • edge equal to 0 corresponds to CU boundary
  • edge equal to 2 or equal to orthogonalLength ⁇ 2 corresponds to sub-block boundary 8 samples from a CU boundary etc.
  • implicit TU is true if implicit split of TU is used.
  • FIG. 8 show the flowcharts of determination process for TU boundaries and sub-PU boundaries.
  • HEVC enables deblocking of a prediction unit boundary when the difference in at least one motion vector component between blocks on respective side of the boundary is equal to or larger than a threshold of 1 sample.
  • a threshold of a half luma sample is introduced to also enable removal of blocking artifacts originating from boundaries between inter prediction units that have a small difference in motion vectors.
  • VTM6 when a CU is coded in merge mode, if the CU contains at least 64 luma samples (that is, CU width times CU height is equal to or larger than 64), and if both CU width and CU height are less than 128 luma samples, an additional flag is signalled to indicate if the combined inter/intra prediction (CIIP) mode is applied to the current CU.
  • the CIIP prediction combines an inter prediction signal with an intra prediction signal.
  • the inter prediction signal in the CIIP mode P inter is derived using the same inter prediction process applied to regular merge mode; and the intra prediction signal P intra is derived following the regular intra prediction process with the planar mode. Then, the intra and inter prediction signals are combined using weighted averaging, where the weight value is calculated depending on the coding modes of the top and left neighbouring blocks as follows:
  • the CIIP prediction is formed as follows:
  • a chroma QP table is used.
  • a signalling mechanism is used for chroma QP tables, which enables that it is flexible to provide encoders the opportunity to optimize the table for SDR and HDR content. It supports for signalling the tables separately for Cb and Cr components. The proposed mechanism signals the chroma QP table as a piece-wise linear function.
  • the residual of a block can be coded with transform skip mode.
  • the transform skip flag is not signalled when the CU level MTS_CU_flag is not equal to zero.
  • the block size limitation for transform skip is the same to that for MTS in JEM4, which indicate that transform skip is applicable for a CU when both block width and height are equal to or less than 32.
  • implicit MTS transform is set to DCT2 when LFNST or MIP is activated for the current CU. Also the implicit MTS can be still enabled when MTS is enabled for inter coded blocks.
  • QP Quantization Parameter
  • the chroma residuals are coded jointly.
  • the usage (activation) of a joint chroma coding mode is indicated by a TU-level flag tu_joint_cbcr_residual_flag and the selected mode is implicitly indicated by the chroma CBFs.
  • the flag tu_joint_cbcr_residual_flag is present if either or both chroma CBFs for a TU are equal to 1.
  • chroma QP offset values are signalled for the joint chroma residual coding mode to differentiate from the usual chroma QP offset values signalled for regular chroma residual coding mode.
  • chroma QP offset values are used to derive the chroma QP values for those blocks coded using the joint chroma residual coding mode.
  • a corresponding joint chroma coding mode (modes 2 in Table 3) is active in a TU, this chroma QP offset is added to the applied luma-derived chroma QP during quantization and decoding of that TU.
  • modes 1 and 3 in Table 3 Table 3 Reconstruction of chroma residuals.
  • the value CSign is a sign value (+1 or ⁇ 1), which is specified in the slice header, resJointC[][] is the transmitted residual.), the chroma QPs are derived in the same way as for conventional Cb or Cr blocks.
  • the reconstruction process of the chroma residuals (resCb and resCr) from the transmitted transform blocks is depicted in Table 3.
  • one single joint chroma residual block (resJointC[x][y] in Table 3) is signalled, and residual block for Cb (resCb) and residual block for Cr (resCr) are derived considering information such as tu_cbf_cb, tu_cbf_cr, and CSign, which is a sign value specified in the slice header.
  • resJointC ⁇ 1,2 ⁇ are generated by the encoder as follows:
  • CSign is a sign value (+1 or ⁇ 1), which is specified in the slice header, resJointC[ ][ ] is the transmitted residual.
  • QPs are utilized are the above three modes.
  • mode 2 the QP offset signaled in PPS for JCCR coded block is applied, while for other two modes, it is not applied, instead, the QP offset signaled in PPS for non-JCCR coded block is applied.
  • Qp Y ( ( qP Y ⁇ _ ⁇ PRED + CuQpDeltaVal + 64 + 2 * ⁇ QpBdOffset Y ) ⁇ % ⁇ ( 6 ⁇ 4 + QpBdOffset Y ) ) - QpBdOffset Y (8-933)
  • the luma quantization parameter Qp′ Y is derived as follows:
  • ChromaArrayType is not equal to 0 and treeType is equal to SINGLE_TREE or DUAL_TREE_CHROMA, the following applies:
  • Qp ′ Cb Clip ⁇ ⁇ 3 ⁇ ( - QpBDOffset C , 63 , qP Cb + pps_cb ⁇ _qp ⁇ _offset + slice_cb ⁇ _qp ⁇ _offset + CuQpOffset Cb ) + QpBdOffset C (8-939)
  • Qp ′ Cr Clip ⁇ ⁇ 3 ⁇ ( - QpBDOffset C , 63 , qP Cr + pps_cr ⁇ _qp ⁇ _offset + slice_cr ⁇ _qp ⁇ _offset + CuQpOffset Cr ) + QpBdOffset C (8-940)
  • Qp ′ CbCr Clip ⁇ ⁇ 3 ⁇ ( - QpBDOffset C , 63 , qP CbCr + pps_cbcr ⁇ _qp ⁇ _offset + slice_cbcr ⁇
  • FIG. 14A illustrates the placement of CC-ALF with respect to the other loop filters.
  • CC-ALF operates by applying a linear, diamond shaped filter ( FIG. 14B ) to the luma channel for each chroma component, which is expressed as
  • ⁇ ⁇ ⁇ I i ⁇ ( x , y ) ⁇ ( x 0 , y 0 ) ⁇ S i ⁇ I 0 ⁇ ( x c + x 0 , y c + y 0 ) ⁇ c i ⁇ ( x 0 , y 0 ) ,
  • the luma location (x C ,y C ), around which the support region is centered, is computed based on the spatial scaling factor between the luma and chroma planes.
  • All filter coefficients are transmitted in the APS and have 8-bit dynamic range.
  • An APS may be referenced in the slice header.
  • CC-ALF coefficients used for each chroma component of a slice are also stored in a buffer corresponding to a temporal sublayer. Reuse of these sets of temporal sublayer filter coefficients is facilitated using slice-level flags.
  • the application of the CC-ALF filters is controlled on a variable block size and signalled by a context-coded flag received for each block of samples.
  • the block size along with an CC-ALF enabling flag is received at the slice-level for each chroma component.
  • Boundary padding for the horizontal virtual boundaries makes use of repetition. For the remaining boundaries the same type of padding is used as for regular ALF.
  • DMVR and BIO do not involve the original signal during refining the motion vectors, which may result in coding blocks with inaccurate motion information. Also, DMVR and BIO sometimes employ the fractional motion vectors after the motion refinements while screen videos usually have integer motion vectors, which makes the current motion information more inaccurate and make the coding performance worse.
  • MVM[i].x and MVM[i].y denote the horizontal and vertical component of the motion vector in reference picture list i (i being 0 or 1) of the block at M (M being P or Q) side. Abs denotes the operation to get the absolute value of an input, and “&&” and “ ⁇ ” denotes the logical operation AND and OR.
  • P may denote the samples at P side and Q may denote the samples at Q side.
  • the blocks at P side and Q side may denote the block marked by the dash lines.
  • CCALF Cross Component Adaptive Loop Filter
  • the newly added texts are shown in underlined bold italicized font.
  • the deleted texts are marked by [[]].
  • variables Qp Q and Qp P are set equal to the Qp Y values of the coding units which include the coding blocks containing the sample q 0,0 and p 0,0 , respectively.
  • the variable Qp C is derived as follows:
  • slice_beta_offset_div2 is the value of the syntax element slice_beta_offset_div2 for the slice that contains sample q 0,0 .
  • the variable ⁇ is derived as follows:
  • variable t C ′ The value of the variable t C ′ is determined as specified in Table 8-18 based on the chroma quantization parameter Q derived as follows:
  • slice_tc_offset_div2 is the value of the syntax element slice_tc_offset_div2 for the slice that contains sample q 0,0 .
  • the variable t C is derived as follows:
  • t C ( BitDepth C ⁇ 1 ⁇ 0 ) ? ⁇ ( t C ′ ⁇ 2 ) ⁇ ( 10 - BitDepth C ⁇ ): t C ′ * ⁇ ( 1 ⁇ ( BitDepth C - 8 ) ) (8-1137)
  • variable ⁇ is determined as specified in Table t-18 based on the quantization parameter Q derived as follows:
  • slice_beta_offset_div2 is the value of the syntax element slice_beta_offset_div2 for the slice that contains sample q 0,0 .
  • the variable ⁇ is derived as follows:
  • variable t C ′ The value of the variable t C ′ is determined as specified in Table 8-18 based on the chroma quantization parameter Q derived as follows:
  • slice_tc_offset_div2 is the value of the syntax element slice_tc_offset_div2 for the slice that contains sample q 0,0 .
  • the variable t C is derived as follows:
  • maxFilterLengthCbCr is equal to 1 and bS is not equal to 2, maxFilterLengthCbCr is set equal to 0.
  • variables Qp Q and Qp P are set equal to the Qp Y values of the coding units which include the coding blocks containing the sample q 0,0 and p 0,0 , respectively.
  • the variable Qp C is derived as follows:
  • variable Qp Q and Qp P are set equal to the Qp Y values of the coding units which include the coding blocks containing the sample q 0,0 and p 0,0 , respectively.]
  • the variable Qp C is derived as follows:
  • slice_beta_offset_div2 is the value of the syntax element slice_beta_offset_div2 for the slice that contains sample q 0,0 .
  • the variable ⁇ is derived as follows:
  • variable t C ′ The value of the variable t C ′ is determined as specified in Table 8-18 based on the chroma quantization parameter Q derived as follows:
  • slice_tc_offset_div2 is the value of the syntax element slice_tc_offset_div2 for the slice that contains sample q 0,0 .
  • the QPs of the luma CU that covers the center position of the chroma CU including the three samples is selected. Therefore, for the 1 st , 2 nd , and 3 rd chroma sample (depicted in FIG. 11 ), only the QP of CU Y 3 is utilized, respectively.
  • the edges are filtered by the following ordered steps: . . . [[5.
  • the picture sample array recPicture is derived as follows:
  • variables Qp Q and Qp P are set equal to the Qp Y values of the coding units which include the coding blocks containing the sample q 0,0 and p 0,0 , respectively.
  • the variable Qp C is derived as follows:
  • slice_beta_offset_div2 is the value of the syntax element slice_beta_offset_div2 for the slice that contains sample q 0,0 .
  • the variable ⁇ is derived as follows:
  • variable t C ′ The value of the variable t C ′ is determined as specified in Table 8-18 based on the chroma quantization parameter Q derived as follows:
  • slice_tc_offset_div2 is the value of the syntax element slice_tc_offset_div2 for the slice that contains sample q 0,0 .
  • the variable t C is derived as follows:
  • t C ( B ⁇ itDepth C ⁇ 10 ) ? ( t C ′ + 2 ) ⁇ ( 10 - B ⁇ itDepth C ) : t C ′ * ( 1 ⁇ ( BitDepth C - 8 ) )
  • maxFilterLengthCbCr is equal to 1 and bS is not equal to 2
  • maxFilterLengthCbCr is set equal to 0.
  • maxFilterLengthCbCr is equal to 3 the following ordered steps apply:
  • edgeType Depending on the value of edgeType, the following applies:
  • variables Qp Q and Qp P are set equal to the Qp Y values of the coding units which include the coding blocks containing the sample q 0,0 and p 0,0 , respectively.
  • the variable Qp C is derived as follows:
  • variables Qp Q and Qp P are set equal to the Qp Y values of the coding units which include the coding blocks containing the sample q 0,0 and p 0,0 , respectively.
  • the variable Qp C is derived as follows:
  • FIG. 12 is a block diagram of a video processing apparatus 1200 .
  • the apparatus 1200 may be used to implement one or more of the methods described herein.
  • the apparatus 1200 may be embodied in a smartphone, tablet, computer, Internet of Things (IoT) receiver, and so on.
  • the apparatus 1200 may include one or more processors 1202 , one or more memories 1204 and video processing hardware 1206 .
  • the processor(s) 1202 may be configured to implement one or more methods described in the present document.
  • the memory (memories) 1204 may be used for storing data and code used for implementing the methods and techniques described herein.
  • the video processing hardware 1206 may be used to implement, in hardware circuitry, some techniques described in the present document, and may be partly or completely be a part of the processors 1202 (e.g., graphics processor core GPU or other signal processing circuitry).
  • video processing may refer to video encoding, video decoding, video compression or video decompression.
  • video compression algorithms may be applied during conversion from pixel representation of a video to a corresponding bitstream representation or vice versa.
  • the bitstream representation of a current video block may, for example, correspond to bits that are either co-located or spread in different places within the bitstream, as is defined by the syntax.
  • a macroblock may be encoded in terms of transformed and coded error residual values and also using bits in headers and other fields in the bitstream.
  • FIG. 13 is a flowchart for an example method 1300 of video processing.
  • the method 1300 includes, at 1310 , performing a conversion between a video unit and a bitstream representation of the video unit, wherein, during the conversion, a deblocking filter is used on boundaries of the video unit such that when a chroma quantization parameter (QP) table is used to derive parameters of the deblocking filter, processing by the chroma QP table is performed on individual chroma QP values.
  • QP chroma quantization parameter
  • a method of video processing comprising:
  • a deblocking filter is used on boundaries of the video unit such that when a chroma quantization parameter (QP) table is used to derive parameters of the deblocking filter, processing by the chroma QP table is performed on individual chroma QP values.
  • QP quantization parameter
  • a method of video processing comprising:
  • a deblocking filter is used on boundaries of the video unit such that chroma QP offsets are used in the deblocking filter, wherein the chroma QP offsets are at picture/slice/tile/brick/sub picture level.
  • a method of video processing comprising:
  • a deblocking filter is used on boundaries of the video unit such that chroma QP offsets are used in the deblocking filter, wherein information pertaining to a same luma coding unit is used in the deblocking filter and for deriving a chroma QP offset.
  • a method of video processing comprising:
  • a deblocking filter is used on boundaries of the video unit such that chroma QP offsets are used in the deblocking filter, wherein an indication of enabling usage of the chroma QP offsets is signaled in the bitstream representation.
  • a method of video processing comprising:
  • a deblocking filter is used on boundaries of the video unit such that chroma QP offsets are used in the deblocking filter, wherein the chroma QP offsets used in the deblocking filter are identical of whether JCCR coding method is applied on a boundary of the video unit or a method different from the JCCR coding method is applied on the boundary of the video unit.
  • a method of video processing comprising:
  • a deblocking filter is used on boundaries of the video unit such that chroma QP offsets are used in the deblocking filter, wherein a boundary strength (BS) of the deblocking filter is calculated without comparing reference pictures and/or a number of motion vectors (MVs) associated with the video unit at a P side boundary with reference pictures and/or a number of motion vectors (MVs) associated with the video unit at a Q side.
  • BS boundary strength
  • the threshold value is associated with at least one of: i. contents of the video unit, ii. a message signaled in DPS/SPS/VPS/PPS/APS/picture header/slice header/tile group header/Largest coding unit (LCU)/Coding unit (CU)/LCU row/group of LCUs/TU/PU block/Video coding unit, iii. a position of CU/PU/TU/block/Video coding unit, iv. a coded mode of blocks with samples along the boundaries, v. a transform matrix applied to the video units with samples along the boundaries, vi. a shape or dimension of the video unit, vii. an indication of a color format, viii. a coding tree structure, ix. a slice/tile group type and/or picture type, x. a color component, xi. a temporal layer ID, or xii. a profile/level/tier of a standard.
  • a video decoding apparatus comprising a processor configured to implement a method recited in one or more of clauses 1 to 25.
  • a video encoding apparatus comprising a processor configured to implement a method recited in one or more of clauses 1 to 25.
  • a computer program product having computer code stored thereon, the code, when executed by a processor, causes the processor to implement a method recited in any of clauses 1 to 25.
  • FIG. 15 is a block diagram that illustrates an example video coding system 100 that may utilize the techniques of this disclosure.
  • video coding system 100 may include a source device 110 and a destination device 120 .
  • Source device 110 generates encoded video data which may be referred to as a video encoding device.
  • Destination device 120 may decode the encoded video data generated by source device 110 which may be referred to as a video decoding device.
  • Source device 110 may include a video source 112 , a video encoder 114 , and an input/output (I/O) interface 116 .
  • Video source 112 may include a source such as a video capture device, an interface to receive video data from a video content provider, and/or a computer graphics system for generating video data, or a combination of such sources.
  • the video data may comprise one or more pictures.
  • Video encoder 114 encodes the video data from video source 112 to generate a bitstream.
  • the bitstream may include a sequence of bits that form a coded representation of the video data.
  • the bitstream may include coded pictures and associated data.
  • the coded picture is a coded representation of a picture.
  • the associated data may include sequence parameter sets, picture parameter sets, and other syntax structures.
  • I/O interface 116 may include a modulator/demodulator (modem) and/or a transmitter.
  • the encoded video data may be transmitted directly to destination device 120 via I/O interface 116 through network 130 a.
  • the encoded video data may also be stored onto a storage medium/server 130 b for access by destination device 120 .
  • Destination device 120 may include an I/O interface 126 , a video decoder 124 , and a display device 122 .
  • I/O interface 126 may include a receiver and/or a modem. I/O interface 126 may acquire encoded video data from the source device 110 or the storage medium/server 130 b. Video decoder 124 may decode the encoded video data. Display device 122 may display the decoded video data to a user. Display device 122 may be integrated with the destination device 120 , or may be external to destination device 120 which be configured to interface with an external display device.
  • Video encoder 114 and video decoder 124 may operate according to a video compression standard, such as the High Efficiency Video Coding (HEVC) standard, Versatile Video Coding (VVC) standard and other current and/or further standards.
  • HEVC High Efficiency Video Coding
  • VVC Versatile Video Coding
  • FIG. 16 is a block diagram illustrating an example of video encoder 200 , which may be video encoder 114 in the system 100 illustrated in FIG. 15 .
  • Video encoder 200 may be configured to perform any or all of the techniques of this disclosure.
  • video encoder 200 includes a plurality of functional components. The techniques described in this disclosure may be shared among the various components of video encoder 200 .
  • a processor may be configured to perform array or all of the techniques described in this disclosure.
  • the functional components of video encoder 200 may include a partition unit 201 , a predication unit 202 which may include a mode select unit 203 , a motion estimation unit 204 , a motion compensation unit 205 and an intra prediction unit 206 , a residual generation unit 207 , a transform unit 208 , a quantization unit 209 , an inverse quantization unit 210 , an inverse transform unit 211 , a reconstruction unit 212 , a buffer 213 , and an entropy encoding unit 214 .
  • a partition unit 201 may include a mode select unit 203 , a motion estimation unit 204 , a motion compensation unit 205 and an intra prediction unit 206 , a residual generation unit 207 , a transform unit 208 , a quantization unit 209 , an inverse quantization unit 210 , an inverse transform unit 211 , a reconstruction unit 212 , a buffer 213 , and an entropy encoding unit 214 .
  • video encoder 200 may include more, fewer, or different functional components.
  • predication unit 202 may include an intra block copy (IBC) unit.
  • the IBC unit may perform predication in an IBC mode in which at least one reference picture is a picture where the current video block is located.
  • IBC intra block copy
  • motion estimation unit 204 and motion compensation unit 205 may be highly integrated, but are represented in the example of FIG. 5 separately for purposes of explanation.
  • Partition unit 201 may partition a picture into one or more video blocks.
  • Video encoder 200 and video decoder 300 may support various video block sizes.
  • Mode select unit 203 may select one of the coding modes, intra or inter, e.g., based on error results, and provide the resulting intra- or inter-coded block to a residual generation unit 207 to generate residual block data and to a reconstruction unit 212 to reconstruct the encoded block for use as a reference picture.
  • Mode select unit 203 may select a combination of intra and inter predication (CIIP) mode in which the predication is based on an inter predication signal and an intra predication signal.
  • CIIP intra and inter predication
  • Mode select unit 203 may also select a resolution for a motion vector (e.g., a sub-pixel or integer pixel precision) for the block in the case of inter-predication.
  • motion estimation unit 204 may generate motion information for the current video block by comparing one or more reference frames from buffer 213 to the current video block.
  • Motion compensation unit 205 may determine a predicted video block for the current video block based on the motion information and decoded samples of pictures from buffer 213 other than the picture associated with the current video block.
  • Motion estimation unit 204 and motion compensation unit 205 may perform different operations for a current video block, for example, depending on whether the current video block is in an I slice, a P slice, or a B slice.
  • motion estimation unit 204 may perform uni-directional prediction for the current video block, and motion estimation unit 204 may search reference pictures of list 0 or list 1 for a reference video block for the current video block. Motion estimation unit 204 may then generate a reference index that indicates the reference picture in list 0 or list 1 that contains the reference video block and a motion vector that indicates a spatial displacement between the current video block and the reference video block. Motion estimation unit 204 may output the reference index, a prediction direction indicator, and the motion vector as the motion information of the current video block. Motion compensation unit 205 may generate the predicted video block of the current block based on the reference video block indicated by the motion information of the current video block.
  • motion estimation unit 204 may perform bi-directional prediction for the current video block, motion estimation unit 204 may search the reference pictures in list 0 for a reference video block for the current video block and may also search the reference pictures in list 1 for another reference video block for the current video block. Motion estimation unit 204 may then generate reference indexes that indicate the reference pictures in list 0 and list 1 containing the reference video blocks and motion vectors that indicate spatial displacements between the reference video blocks and the current video block. Motion estimation unit 204 may output the reference indexes and the motion vectors of the current video block as the motion information of the current video block. Motion compensation unit 205 may generate the predicted video block of the current video block based on the reference video blocks indicated by the motion information of the current video block.
  • motion estimation unit 204 may output a full set of motion information for decoding processing of a decoder.
  • motion estimation unit 204 may do not output a full set of motion information for the current video. Rather, motion estimation unit 204 may signal the motion information of the current video block with reference to the motion information of another video block. For example, motion estimation unit 204 may determine that the motion information of the current video block is sufficiently similar to the motion information of a neighboring video block.
  • motion estimation unit 204 may indicate, in a syntax structure associated with the current video block, a value that indicates to the video decoder 300 that the current video block has the same motion information as the another video block.
  • motion estimation unit 204 may identify, in a syntax structure associated with the current video block, another video block and a motion vector difference (MVD).
  • the motion vector difference indicates a difference between the motion vector of the current video block and the motion vector of the indicated video block.
  • the video decoder 300 may use the motion vector of the indicated video block and the motion vector difference to determine the motion vector of the current video block.
  • video encoder 200 may predictively signal the motion vector.
  • Two examples of predictive signaling techniques that may be implemented by video encoder 200 include advanced motion vector predication (AMVP) and merge mode signaling.
  • AMVP advanced motion vector predication
  • merge mode signaling merge mode signaling
  • Intra prediction unit 206 may perform intra prediction on the current video block. When intra prediction unit 206 performs intra prediction on the current video block, intra prediction unit 206 may generate prediction data for the current video block based on decoded samples of other video blocks in the same picture.
  • the prediction data for the current video block may include a predicted video block and various syntax elements.
  • Residual generation unit 207 may generate residual data for the current video block by subtracting (e.g., indicated by the minus sign) the predicted video block(s) of the current video block from the current video block.
  • the residual data of the current video block may include residual video blocks that correspond to different sample components of the samples in the current video block.
  • residual generation unit 207 may not perform the subtracting operation.
  • Transform processing unit 208 may generate one or more transform coefficient video blocks for the current video block by applying one or more transforms to a residual video block associated with the current video block.
  • quantization unit 209 may quantize the transform coefficient video block associated with the current video block based on one or more quantization parameter (QP) values associated with the current video block.
  • QP quantization parameter
  • Inverse quantization unit 210 and inverse transform unit 211 may apply inverse quantization and inverse transforms to the transform coefficient video block, respectively, to reconstruct a residual video block from the transform coefficient video block.
  • Reconstruction unit 212 may add the reconstructed residual video block to corresponding samples from one or more predicted video blocks generated by the predication unit 202 to produce a reconstructed video block associated with the current block for storage in the buffer 213 .
  • loop filtering operation may be performed reduce video blocking artifacts in the video block.
  • Entropy encoding unit 214 may receive data from other functional components of the video encoder 200 . When entropy encoding unit 214 receives the data, entropy encoding unit 214 may perform one or more entropy encoding operations to generate entropy encoded data and output a bitstream that includes the entropy encoded data.
  • FIG. 17 is a block diagram illustrating an example of video decoder 300 which may be video decoder 114 in the system 100 illustrated in FIG. 15 .
  • the video decoder 300 may be configured to perform any or all of the techniques of this disclosure.
  • the video decoder 300 includes a plurality of functional components.
  • the techniques described in this disclosure may be shared among the various components of the video decoder 300 .
  • a processor may be configured to perform any or all of the techniques described in this disclosure.
  • video decoder 300 includes an entropy decoding unit 301 , a motion compensation unit 302 , an intra prediction unit 303 , an inverse quantization unit 304 , an inverse transformation unit 305 , and a reconstruction unit 306 and a buffer 307 .
  • Video decoder 300 may, in some examples, perform a decoding pass generally reciprocal to the encoding pass described with respect to video encoder 200 (e.g., FIG. 16 ).
  • Entropy decoding unit 301 may retrieve an encoded bitstream.
  • the encoded bitstream may include entropy coded video data (e.g., encoded blocks of video data).
  • Entropy decoding unit 301 may decode the entropy coded video data, and from the entropy decoded video data, motion compensation unit 302 may determine motion information including motion vectors, motion vector precision, reference picture list indexes, and other motion information. Motion compensation unit 302 may, for example, determine such information by performing the AMVP and merge mode.
  • Motion compensation unit 302 may produce motion compensated blocks, possibly performing interpolation based on interpolation filters. Identifiers for interpolation filters to be used with sub-pixel precision may be included in the syntax elements.
  • Motion compensation unit 302 may use interpolation filters as used by video encoder 20 during encoding of the video block to calculate interpolated values for sub-integer pixels of a reference block. Motion compensation unit 302 may determine the interpolation filters used by video encoder 200 according to received syntax information and use the interpolation filters to produce predictive blocks.
  • Motion compensation unit 302 may uses some of the syntax information to determine sizes of blocks used to encode frame(s) and/or slice(s) of the encoded video sequence, partition information that describes how each macroblock of a picture of the encoded video sequence is partitioned, modes indicating how each partition is encoded, one or more reference frames (and reference frame lists) for each inter-encoded block, and other information to decode the encoded video sequence.
  • Intra prediction unit 303 may use intra prediction modes for example received in the bitstream to form a prediction block from spatially adjacent blocks.
  • Inverse quantization unit 303 inverse quantizes, i.e., de-quantizes, the quantized video block coefficients provided in the bitstream and decoded by entropy decoding unit 301 .
  • Inverse transform unit 303 applies an inverse transform.
  • Reconstruction unit 306 may sum the residual blocks with the corresponding prediction blocks generated by motion compensation unit 202 or intra-prediction unit 303 to form decoded blocks. If desired, a deblocking filter may also be applied to filter the decoded blocks in order to remove blockiness artifacts. The decoded video blocks are then stored in buffer 307 , which provides reference blocks for subsequent motion compensation.
  • FIG. 18 is a block diagram showing an example video processing system 1800 in which various techniques disclosed herein may be implemented.
  • the system 1800 may include input 1802 for receiving video content.
  • the video content may be received in a raw or uncompressed format, e.g., 8 or 10 bit multi-component pixel values, or may be in a compressed or encoded format.
  • the input 1802 may represent a network interface, a peripheral bus interface, or a storage interface. Examples of network interface include wired interfaces such as Ethernet, passive optical network (PON), etc. and wireless interfaces such as Wi-Fi or cellular interfaces.
  • the system 1800 may include a coding component 1804 that may implement the various coding or encoding methods described in the present document.
  • the coding component 1804 may reduce the average bitrate of video from the input 1802 to the output of the coding component 1804 to produce a coded representation of the video.
  • the coding techniques are therefore sometimes called video compression or video transcoding techniques.
  • the output of the coding component 1804 may be either stored, or transmitted via a communication connected, as represented by the component 1806 .
  • the stored or communicated bitstream (or coded) representation of the video received at the input 1802 may be used by the component 1808 for generating pixel values or displayable video that is sent to a display interface 1810 .
  • the process of generating user-viewable video from the bitstream representation is sometimes called video decompression.
  • certain video processing operations are referred to as “coding” operations or tools, it will be appreciated that the coding tools or operations are used at an encoder and corresponding decoding tools or operations that reverse the results of the coding will
  • peripheral bus interface or a display interface may include universal serial bus (USB) or high definition multimedia interface (HDMI) or Display port, and so on.
  • storage interfaces include SATA (serial advanced technology attachment), PCI, IDE interface, and the like.
  • FIG. 19 is a flowchart representation of a method for video processing in accordance with the present technology.
  • the method 1900 includes, at operation 1910 , determining, for a conversion between a chroma block of a video and a bitstream representation of the video, applicability of a deblocking filter process to at least some samples at an edge of the chroma block based on a mode of joint coding of chroma residuals for the chroma block.
  • the method 1900 also includes, at operation 1920 , performing the conversion based on the determining.
  • a value indicating the mode of the joint coding of chroma residuals is equal to 2.
  • the deblocking filter process further uses one or more quantization parameter offsets at a video unit level, the video unit comprising a picture, a slice, a tile, a brick, or a subpicture.
  • FIG. 20 is a flowchart representation of a method for video processing in accordance with the present technology.
  • the method 2000 includes, at operation 2010 , determining, for a conversion between a current block of a video and a bitstream representation of the video, a chroma quantization parameter used in a deblocking filtering process applied to at least some samples at an edge of the current block based on information of a corresponding transform block of the current block.
  • the method 2000 also includes, at operation 2020 , performing the conversion based on the determining.
  • the chroma quantization parameter is used for deblocking samples along a first side of the edge of the current block, and the chroma quantization parameter is based on a mode of the transform block that are on the first side.
  • the first side is referred to as P-side, the P-side comprising samples located above the edge in case the edge is a horizontal boundary or to the left of the edge in case the edge is a vertical boundary.
  • the chroma quantization parameter is used for deblocking samples along a second side of the edge of the current block, and the chroma quantization parameter is based on a mode of the transform block that are on the second side.
  • the second side is referred to as Q-side, the Q-side comprising samples located below the edge in case the edge is a horizontal boundary or to the right of the edge in case the edge is a vertical boundary.
  • the chroma quantization parameter is determined based on whether a mode of joint coding of chroma residuals is applied. In some embodiments, the chroma quantization parameter is determined based on whether a mode of the joint coding of chroma residuals is equal to 2.
  • FIG. 21 is a flowchart representation of a method for video processing in accordance with the present technology.
  • the method 2100 includes, at operation 2110 , performing a conversion between a current block of a video and a bitstream representation of the video.
  • a first chroma quantization parameter used in a deblocking filtering process applied to at least some samples along an edge of the current block is based on a second chroma quantization parameter used in a scaling process and a quantization parameter offset associated with a bit depth.
  • the first chroma quantization parameter is equal to the second quantization parameter used in the scaling process minus the quantization parameter offset associated with the bit depth.
  • the first side is referred to as P-side, the P-side comprising samples located above the edge in case the edge is a horizontal boundary or to the left of the edge in case the boundary is a vertical boundary.
  • the second side is referred to as Q-side, the Q-side comprising samples located below the edge in case the edge is a horizontal boundary or to the right of the edge in case the edge is a vertical boundary.
  • the first chroma quantization parameter is equal to the second quantization parameter for a joint coding of chroma residuals used in the scaling process minus quantization parameter offset associated with the bit depth. In some embodiments, the first chroma quantization parameter is equal to the second quantization parameter for a chroma Cb component used in the scaling process minus quantization parameter offset associated with the bit depth. In some embodiments, the first chroma quantization parameter is equal to the second quantization parameter for a chroma Cr component used in the scaling process minus quantization parameter offset associated with the bit depth.
  • FIG. 22 is a flowchart representation of a method for video processing in accordance with the present technology.
  • the method 2200 includes, at operation 2210 , performing a conversion between a video comprising one or more coding units and a bitstream representation of the video.
  • the bitstream representation conforms to a format rule that specifies that chroma quantization parameters are included in the bitstream representation at a coding unit level or a transform unit level according to the format rule.
  • the format rule specifies that the chroma quantization parameter is included at a coding unit level in case a size of the coding unit is larger than a virtual pipeline data unit. In some embodiments, the format rule specifies that the chroma quantization parameter is included at a transform unit level in case a size of the coding unit is larger than or equal to a virtual pipeline data unit. In some embodiments, the format rule specifies that the chroma quantization parameter is included at a coding unit level in case a size of the coding unit is larger than a maximum transform block size.
  • the format rule specifies that the chroma quantization parameter is included at a transform unit level in case a size of the coding unit is larger than or equal to a maximum transform block size. In some embodiments, the format rule further specifies that whether a joint coding of chroma residuals mode is applicable to a first coding unit of the one or more coding units is indicated at a coding unit level. In some embodiments, a transform block within the first coding unit inherits information about whether the joint coding of chroma residuals mode is applicable at the first coding unit level.
  • FIG. 23 is a flowchart representation of a method for video processing in accordance with the present technology.
  • the method 2300 includes, at operation 2310 , performing a conversion between a block of a video and a bitstream representation of the video.
  • the bitstream representation conforms to a format rule specifying that whether a joint coding of chroma residuals mode is applicable to the block is indicated at a coding unit level in the bitstream representation.
  • a transform block within a coding unit inherits information about whether the joint coding of chroma residuals mode is applicable at the coding unit level.
  • the conversion includes encoding the video into the bitstream representation. In some embodiments, the conversion includes decoding the bitstream representation into the video.
  • Some embodiments of the disclosed technology include making a decision or determination to enable a video processing tool or mode.
  • the encoder when the video processing tool or mode is enabled, the encoder will use or implement the tool or mode in the processing of a block of video, but may not necessarily modify the resulting bitstream based on the usage of the tool or mode. That is, a conversion from the block of video to the bitstream representation of the video will use the video processing tool or mode when it is enabled based on the decision or determination.
  • the decoder when the video processing tool or mode is enabled, the decoder will process the bitstream with the knowledge that the bitstream has been modified based on the video processing tool or mode. That is, a conversion from the bitstream representation of the video to the block of video will be performed using the video processing tool or mode that was enabled based on the decision or determination.
  • Some embodiments of the disclosed technology include making a decision or determination to disable a video processing tool or mode.
  • the encoder will not use the tool or mode in the conversion of the block of video to the bitstream representation of the video.
  • the decoder will process the bitstream with the knowledge that the bitstream has not been modified using the video processing tool or mode that was enabled based on the decision or determination.
  • the disclosed and other solutions, examples, embodiments, modules and the functional operations described in this document can be implemented in digital electronic circuitry, or in computer software, firmware, or hardware, including the structures disclosed in this document and their structural equivalents, or in combinations of one or more of them.
  • the disclosed and other embodiments can be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a computer readable medium for execution by, or to control the operation of, data processing apparatus.
  • the computer readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter effecting a machine-readable propagated signal, or a combination of one or more them.
  • data processing apparatus encompasses all apparatus, devices, and machines for processing data, including by way of example a programmable processor, a computer, or multiple processors or computers.
  • the apparatus can include, in addition to hardware, code that creates an execution environment for the computer program in question, e.g., code that constitutes processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them.
  • a propagated signal is an artificially generated signal, e.g., a machine-generated electrical, optical, or electromagnetic signal, that is generated to encode information for transmission to suitable receiver apparatus.
  • a computer program (also known as a program, software, software application, script, or code) can be written in any form of programming language, including compiled or interpreted languages, and it can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.
  • a computer program does not necessarily correspond to a file in a file system.
  • a program can be stored in a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document), in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, sub programs, or portions of code).
  • a computer program can be deployed to be executed on one computer or on multiple computers that are located at one site or distributed across multiple sites and interconnected by a communication network.
  • the processes and logic flows described in this document can be performed by one or more programmable processors executing one or more computer programs to perform functions by operating on input data and generating output.
  • the processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic circuitry, e.g., an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit).
  • processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer.
  • a processor will receive instructions and data from a read only memory or a random-access memory or both.
  • the essential elements of a computer are a processor for performing instructions and one or more memory devices for storing instructions and data.
  • a computer will also include, or be operatively coupled to receive data from or transfer data to, or both, one or more mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks.
  • mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks.
  • a computer need not have such devices.
  • Computer readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media and memory devices, including by way of example semiconductor memory devices, e.g., EPROM, EEPROM, and flash memory devices; magnetic disks, e.g., internal hard disks or removable disks; magneto optical disks; and CD ROM and DVD-ROM disks.
  • semiconductor memory devices e.g., EPROM, EEPROM, and flash memory devices
  • magnetic disks e.g., internal hard disks or removable disks
  • magneto optical disks e.g., CD ROM and DVD-ROM disks.
  • the processor and the memory can be supplemented by, or incorporated in, special purpose logic circuitry.
US17/720,582 2019-10-14 2022-04-14 Joint coding of chroma residual and filtering in video processing Pending US20220272347A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US18/519,994 US20240107038A1 (en) 2019-10-14 2023-11-27 Joint coding of chroma residual and filtering in video processing

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CNPCT/CN2019/111115 2019-10-14
CN2019111115 2019-10-14
PCT/US2020/055329 WO2021076475A1 (fr) 2019-10-14 2020-10-13 Codage conjoint de résidu de chrominance et filtrage dans un traitement vidéo

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2020/055329 Continuation WO2021076475A1 (fr) 2019-10-14 2020-10-13 Codage conjoint de résidu de chrominance et filtrage dans un traitement vidéo

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/519,994 Continuation US20240107038A1 (en) 2019-10-14 2023-11-27 Joint coding of chroma residual and filtering in video processing

Publications (1)

Publication Number Publication Date
US20220272347A1 true US20220272347A1 (en) 2022-08-25

Family

ID=75538852

Family Applications (3)

Application Number Title Priority Date Filing Date
US17/720,634 Active US11622120B2 (en) 2019-10-14 2022-04-14 Using chroma quantization parameter in video coding
US17/720,582 Pending US20220272347A1 (en) 2019-10-14 2022-04-14 Joint coding of chroma residual and filtering in video processing
US18/519,994 Pending US20240107038A1 (en) 2019-10-14 2023-11-27 Joint coding of chroma residual and filtering in video processing

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US17/720,634 Active US11622120B2 (en) 2019-10-14 2022-04-14 Using chroma quantization parameter in video coding

Family Applications After (1)

Application Number Title Priority Date Filing Date
US18/519,994 Pending US20240107038A1 (en) 2019-10-14 2023-11-27 Joint coding of chroma residual and filtering in video processing

Country Status (6)

Country Link
US (3) US11622120B2 (fr)
EP (2) EP4029264A4 (fr)
JP (3) JP2022552338A (fr)
KR (2) KR20220073746A (fr)
CN (3) CN114586370B (fr)
WO (2) WO2021076478A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220303586A1 (en) * 2021-03-19 2022-09-22 Tencent America LLC Adaptive Non-Linear Mapping for Sample Offset
US20220321882A1 (en) 2019-12-09 2022-10-06 Bytedance Inc. Using quantization groups in video coding
US20220408093A1 (en) * 2019-11-05 2022-12-22 Lg Electronics Inc. Video decoding method and device for coding chroma quantization parameter offset-related information
US11622120B2 (en) 2019-10-14 2023-04-04 Bytedance Inc. Using chroma quantization parameter in video coding
US11750806B2 (en) 2019-12-31 2023-09-05 Bytedance Inc. Adaptive color transform in video coding
US11785260B2 (en) 2019-10-09 2023-10-10 Bytedance Inc. Cross-component adaptive loop filtering in video coding
US11973959B2 (en) 2019-09-14 2024-04-30 Bytedance Inc. Quantization parameter for chroma deblocking filtering
US11985329B2 (en) 2019-09-14 2024-05-14 Bytedance Inc. Quantization parameter offset for chroma deblocking filtering

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3782371A4 (fr) * 2018-03-30 2021-12-22 Sharp Kabushiki Kaisha Systèmes et procédés pour appliquer des filtres de déblocage à des données vidéo reconstruites
US11973966B2 (en) * 2019-03-12 2024-04-30 Hyundai Motor Company Method and apparatus for efficiently coding residual blocks
JP7343596B6 (ja) * 2019-08-23 2024-02-26 華為技術有限公司 合同クロマ符号化を使用するブロックについてクロマ・ブロッキング解除を実行するためのエンコーダ、デコーダおよび対応する方法
US11595676B2 (en) 2020-09-16 2023-02-28 Tencent America LLC Method and apparatus for video coding
US11722675B2 (en) * 2020-12-29 2023-08-08 Qualcomm Incorporated Sign prediction for multiple color components in video coding
WO2023171940A1 (fr) * 2022-03-08 2023-09-14 현대자동차주식회사 Procédé et appareil de codage vidéo au moyen d'une conversion de chrominance adaptative

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150365695A1 (en) * 2014-06-11 2015-12-17 Qualcomm Incorporated Determining application of deblocking filtering to palette coded blocks in video coding
US20210058643A1 (en) * 2019-08-23 2021-02-25 Tencent America LLC Method and apparatus for video coding
US20210076032A1 (en) * 2019-09-09 2021-03-11 Qualcomm Incorporated Filter shapes for cross-component adaptive loop filter with different chroma formats in video coding
US20210266552A1 (en) * 2019-08-23 2021-08-26 Huawei Technologies Co.,Ltd. Performing chroma deblocking for blocks which use joint chroma coding
US20220210448A1 (en) * 2019-09-14 2022-06-30 Bytedance Inc. Chroma quantization parameter in video coding

Family Cites Families (103)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5512953A (en) * 1994-08-09 1996-04-30 At&T Corp. Method and apparatus for conversion of compressed bit stream representation of video signal
US7123655B2 (en) 2001-08-09 2006-10-17 Sharp Laboratories Of America, Inc. Method for reduced bit-depth quantization
US7190723B2 (en) 2002-03-27 2007-03-13 Scientific-Atlanta, Inc. Digital stream transcoder with a hybrid-rate controller
US7227901B2 (en) 2002-11-21 2007-06-05 Ub Video Inc. Low-complexity deblocking filter
US20040146108A1 (en) 2003-01-23 2004-07-29 Shih-Chang Hsia MPEG-II video encoder chip design
US7227585B1 (en) 2003-12-30 2007-06-05 Conexant Systems, Inc. Luminance and chrominance separation system
US8953673B2 (en) * 2008-02-29 2015-02-10 Microsoft Corporation Scalable video coding and decoding with sample bit depth and chroma high-pass residual layers
US9185426B2 (en) 2008-08-19 2015-11-10 Broadcom Corporation Method and system for motion-compensated frame-rate up-conversion for both compressed and decompressed video bitstreams
JP2011259362A (ja) 2010-06-11 2011-12-22 Sony Corp 画像処理装置および方法
KR20120035096A (ko) * 2010-10-04 2012-04-13 한국전자통신연구원 쿼드 트리 변환 구조에서 부가 정보의 시그널링 방법 및 장치
US8891617B2 (en) 2011-01-18 2014-11-18 Google Inc. Method and system for processing video data
US10409892B2 (en) * 2011-01-26 2019-09-10 Microsoft Technology Licensing, Llc Formatting data by example
US9363509B2 (en) 2011-03-03 2016-06-07 Electronics And Telecommunications Research Institute Method for determining color difference component quantization parameter and device using the method
JP5936939B2 (ja) 2011-07-14 2016-06-22 パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ 画像符号化方法および画像復号化方法
US8964833B2 (en) 2011-07-19 2015-02-24 Qualcomm Incorporated Deblocking of non-square blocks for video coding
US9510020B2 (en) * 2011-10-20 2016-11-29 Qualcomm Incorporated Intra pulse code modulation (IPCM) and lossless coding mode deblocking for video coding
US9807403B2 (en) 2011-10-21 2017-10-31 Qualcomm Incorporated Adaptive loop filtering for chroma components
US9161046B2 (en) 2011-10-25 2015-10-13 Qualcomm Incorporated Determining quantization parameters for deblocking filtering for video coding
US20130107973A1 (en) 2011-10-28 2013-05-02 Qualcomm Incorporated Loop filtering control over tile boundaries
US9807401B2 (en) * 2011-11-01 2017-10-31 Qualcomm Incorporated Transform unit partitioning for chroma components in video coding
US20140321552A1 (en) 2011-11-18 2014-10-30 Dolby Laboratories Licensing Corporation Optimization of Deblocking Filter Parameters
CN104137545B (zh) * 2012-01-19 2018-06-05 寰发股份有限公司 编码块旗标的编码及视频比特流的解码方法与装置
US9538200B2 (en) 2012-01-19 2017-01-03 Qualcomm Incorporated Signaling of deblocking filter parameters in video coding
US9451258B2 (en) * 2012-04-03 2016-09-20 Qualcomm Incorporated Chroma slice-level QP offset and deblocking
KR101749297B1 (ko) * 2012-04-12 2017-06-21 미디어텍 싱가폴 피티이. 엘티디. 크로마 서브샘플링 포맷들의 블록 파티션을 위한 방법 및 장치
GB2501535A (en) 2012-04-26 2013-10-30 Sony Corp Chrominance Processing in High Efficiency Video Codecs
US9591302B2 (en) * 2012-07-02 2017-03-07 Microsoft Technology Licensing, Llc Use of chroma quantization parameter offsets in deblocking
US9414054B2 (en) * 2012-07-02 2016-08-09 Microsoft Technology Licensing, Llc Control and use of chroma quantization parameter values
US10448032B2 (en) 2012-09-04 2019-10-15 Qualcomm Incorporated Signaling of down-sampling location information in scalable video coding
GB2506852B (en) * 2012-09-28 2015-09-30 Canon Kk Method and device for determining the value of a quantization parameter
TWI610574B (zh) 2012-09-29 2018-01-01 微軟技術授權有限責任公司 於解塊中色度量化參數偏移之使用
JP2014116733A (ja) 2012-12-07 2014-06-26 Canon Inc 画像符号化装置、画像符号化方法及びプログラム、画像復号装置、画像復号方法及びプログラム
AU2013200051B2 (en) * 2013-01-04 2016-02-11 Canon Kabushiki Kaisha Method, apparatus and system for de-blocking video data
US10321130B2 (en) 2013-01-07 2019-06-11 Vid Scale, Inc. Enhanced deblocking filters for video coding
US9225991B2 (en) 2013-05-30 2015-12-29 Apple Inc. Adaptive color space transform coding
US11323747B2 (en) 2013-06-05 2022-05-03 Qualcomm Incorporated Residual differential pulse code modulation (DPCM) extensions and harmonization with transform skip, rotation, and scans
US20140376611A1 (en) 2013-06-21 2014-12-25 Qualcomm Incorporated Adaptive color transforms for video coding
US9510002B2 (en) * 2013-09-09 2016-11-29 Apple Inc. Chroma quantization in video coding
US11109036B2 (en) 2013-10-14 2021-08-31 Microsoft Technology Licensing, Llc Encoder-side options for intra block copy prediction mode for video and image coding
AU2013403224B2 (en) 2013-10-14 2018-10-18 Microsoft Technology Licensing, Llc Features of intra block copy prediction mode for video and image coding and decoding
AU2014385774B2 (en) 2014-03-04 2019-01-17 Microsoft Technology Licensing, Llc Adaptive switching of color spaces, color sampling rates and/or bit depths
US9948933B2 (en) * 2014-03-14 2018-04-17 Qualcomm Incorporated Block adaptive color-space conversion coding
MX356497B (es) 2014-03-14 2018-05-31 Vid Scale Inc Sistemas y metodos para una mejora de codificacion de video rgb.
AU2014202921B2 (en) 2014-05-29 2017-02-02 Canon Kabushiki Kaisha Method, apparatus and system for de-blocking a block of video samples
US10142642B2 (en) * 2014-06-04 2018-11-27 Qualcomm Incorporated Block adaptive color-space conversion coding
US10136141B2 (en) 2014-06-11 2018-11-20 Qualcomm Incorporated Determining quantization parameter (QP) values and delta QP values for palette coded blocks in video coding
US20150373327A1 (en) 2014-06-20 2015-12-24 Qualcomm Incorporated Block adaptive color-space conversion coding
KR102051193B1 (ko) * 2014-09-12 2019-12-02 브이아이디 스케일, 인크. 비디오 코딩을 위한 성분간 탈상관
WO2016056977A1 (fr) 2014-10-06 2016-04-14 Telefonaktiebolaget L M Ericsson (Publ) Codage et élaboration de paramètres de quantification
US10057578B2 (en) 2014-10-07 2018-08-21 Qualcomm Incorporated QP derivation and offset for adaptive color transform in video coding
US9854201B2 (en) 2015-01-16 2017-12-26 Microsoft Technology Licensing, Llc Dynamically updating quality to higher chroma sampling rate
US10057574B2 (en) 2015-02-11 2018-08-21 Qualcomm Incorporated Coding tree unit (CTU) level adaptive loop filter (ALF)
EP3243330B1 (fr) 2015-02-13 2021-10-27 MediaTek Inc. Rocédé de codage de syntaxe de palette dans une compression d'image et de vidéo
US20160286226A1 (en) 2015-03-24 2016-09-29 Nokia Technologies Oy Apparatus, a method and a computer program for video coding and decoding
WO2017052440A1 (fr) * 2015-09-23 2017-03-30 Telefonaktiebolaget Lm Ericsson (Publ) Détermination de valeurs de qp
US20170105014A1 (en) * 2015-10-08 2017-04-13 Qualcomm Incorporated Luma-driven chroma scaling for high dynamic range and wide color gamut contents
US10701361B2 (en) * 2015-11-30 2020-06-30 Telefonaktiebolaget Lm Ericsson (Publ) Encoding of pictures in a video
US11064195B2 (en) 2016-02-15 2021-07-13 Qualcomm Incorporated Merging filters for multiple classes of blocks for video coding
US10419755B2 (en) 2016-05-16 2019-09-17 Qualcomm Incorporated Confusion of multiple filters in adaptive loop filtering in video coding
CN112689147B (zh) * 2016-05-28 2023-10-13 寰发股份有限公司 视频数据处理方法以及装置
EP3456043A4 (fr) * 2016-05-28 2019-11-27 MediaTek Inc. Procédé et appareil de référencement d'image courante pour le codage vidéo utilisant une compensation de mouvement affine
WO2018018486A1 (fr) 2016-07-28 2018-02-01 Mediatek Inc. Procédés de dérivation de paramètres de quantification de référence pour signaler un paramètre de quantification dans une structure d'arbre quaternaire et d'arbre binaire
US11095922B2 (en) 2016-08-02 2021-08-17 Qualcomm Incorporated Geometry transformation-based adaptive loop filtering
US10419757B2 (en) 2016-08-31 2019-09-17 Qualcomm Incorporated Cross-component filter
US20180091812A1 (en) * 2016-09-23 2018-03-29 Apple Inc. Video compression system providing selection of deblocking filters parameters based on bit-depth of video data
US10506230B2 (en) 2017-01-04 2019-12-10 Qualcomm Incorporated Modified adaptive loop filter temporal prediction for temporal scalability support
US20180199057A1 (en) 2017-01-12 2018-07-12 Mediatek Inc. Method and Apparatus of Candidate Skipping for Predictor Refinement in Video Coding
US10554974B2 (en) * 2017-01-13 2020-02-04 Mediatek Inc. Method and apparatus enabling adaptive multiple transform for chroma transport blocks using control flags
US10708591B2 (en) 2017-03-20 2020-07-07 Qualcomm Incorporated Enhanced deblocking filtering design in video coding
US10212456B2 (en) 2017-06-02 2019-02-19 Apple Inc. Deblocking filter for high dynamic range (HDR) video
JP7406378B2 (ja) 2017-06-21 2023-12-27 ヴィド スケール インコーポレイテッド ３６０度ビデオ符号化のための適応的量子化
US11070818B2 (en) * 2017-07-05 2021-07-20 Telefonaktiebolaget Lm Ericsson (Publ) Decoding a block of video samples
US10778974B2 (en) 2017-07-05 2020-09-15 Qualcomm Incorporated Adaptive loop filter with enhanced classification methods
US11019339B2 (en) 2017-07-12 2021-05-25 Futurewei Technologies, Inc. Fractional quantization parameter offset in video compression
GB2575090A (en) * 2018-06-28 2020-01-01 Canon Kk Method and apparatus for deblocking filtering a block of pixels
US10616577B2 (en) * 2017-10-16 2020-04-07 Intel Corporation Adaptive video deblocking
US10812798B2 (en) * 2017-10-19 2020-10-20 Qualcomm Incorporated Chroma quantization parameter (QP) offset
CN116866559A (zh) 2017-11-01 2023-10-10 Vid拓展公司 用于简化视频译码中的自适应环路滤波器的方法
US10972729B2 (en) 2018-01-20 2021-04-06 Qualcomm Incorporated Deblocking filter selection and application in video coding
US20190238845A1 (en) 2018-01-26 2019-08-01 Qualcomm Incorporated Adaptive loop filtering on deblocking filter results in video coding
JP7299221B2 (ja) * 2018-01-26 2023-06-27 インターデジタル ヴイシー ホールディングス， インコーポレイテッド 隣接サンプルに応じた線形モデルに基づく映像符号化及び復号のための方法と装置
EP3782371A4 (fr) 2018-03-30 2021-12-22 Sharp Kabushiki Kaisha Systèmes et procédés pour appliquer des filtres de déblocage à des données vidéo reconstruites
US20190306502A1 (en) 2018-04-02 2019-10-03 Qualcomm Incorporated System and method for improved adaptive loop filtering
US10708592B2 (en) 2018-04-02 2020-07-07 Qualcomm Incorporated Deblocking filter for video coding and processing
EP3554074A1 (fr) 2018-04-13 2019-10-16 Thomson Licensing Procédés et appareil de codage et de décodage en profondeur
KR101997681B1 (ko) 2018-06-11 2019-07-08 광운대학교 산학협력단 양자화 파라미터 기반의 잔차 블록 부호화/복호화 방법 및 장치
US20200213570A1 (en) 2019-01-02 2020-07-02 Mediatek Inc. Method for processing projection-based frame that includes at least one projection face and at least one padding region packed in 360-degree virtual reality projection layout
CN113383554B (zh) 2019-01-13 2022-12-16 北京字节跳动网络技术有限公司 LUT和共享Merge列表之间的交互
SG11202109287PA (en) 2019-02-27 2021-09-29 Huawei Tech Co Ltd Adaptation parameter set identifier value spaces in video coding
CN113519164A (zh) 2019-03-02 2021-10-19 北京字节跳动网络技术有限公司 对分割结构的限制
CN117499644A (zh) 2019-03-14 2024-02-02 北京字节跳动网络技术有限公司 环路整形信息的信令和语法
EP3925226A4 (fr) 2019-03-24 2022-08-17 Beijing Bytedance Network Technology Co., Ltd. Filtrage de boucle adaptatif non linéaire dans un traitement vidéo
CN113647108A (zh) 2019-03-27 2021-11-12 北京字节跳动网络技术有限公司 基于历史的运动矢量预测
TWI739386B (zh) 2019-04-11 2021-09-11 聯發科技股份有限公司 具有適應性參數集之適應性迴路濾波器
WO2020211769A1 (fr) 2019-04-15 2020-10-22 Beijing Bytedance Network Technology Co., Ltd. Dérivation de paramètres d'écrêtage dans un filtre à boucle adaptatif
CN117499679A (zh) 2019-04-16 2024-02-02 北京字节跳动网络技术有限公司 用于视频编解码的自适应环路滤波
SG11202111738RA (en) 2019-04-25 2021-11-29 Op Solutions Llc Global motion constrained motion vector in inter prediction
US11381819B2 (en) * 2019-07-05 2022-07-05 Qualcomm Incorporated Chroma delta quantization parameter (QP) in video coding
CN114600466A (zh) 2019-08-29 2022-06-07 Lg电子株式会社 基于交叉分量滤波的图像编码设备和方法
CN116744002A (zh) 2019-09-24 2023-09-12 华为技术有限公司 视频译码中的sei消息依赖简化
JP2022552338A (ja) 2019-10-14 2022-12-15 バイトダンス インコーポレイテッド クロマ残差の共同コーディング及びビデオ処理におけるフィルタリング
EP4070545A4 (fr) 2019-12-23 2023-03-08 Huawei Technologies Co., Ltd. Filtrage à boucle adaptatif à composante transversale permettant le codage vidéo
US11375200B2 (en) 2019-12-24 2022-06-28 Tencent America LLC Video coding method and device for controlling color component processing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150365695A1 (en) * 2014-06-11 2015-12-17 Qualcomm Incorporated Determining application of deblocking filtering to palette coded blocks in video coding
US20210058643A1 (en) * 2019-08-23 2021-02-25 Tencent America LLC Method and apparatus for video coding
US20210266552A1 (en) * 2019-08-23 2021-08-26 Huawei Technologies Co.,Ltd. Performing chroma deblocking for blocks which use joint chroma coding
US20220191496A1 (en) * 2019-08-23 2022-06-16 Huawei Technologies Co., Ltd. Performing chroma deblocking for blocks which use joint chroma coding
US20210076032A1 (en) * 2019-09-09 2021-03-11 Qualcomm Incorporated Filter shapes for cross-component adaptive loop filter with different chroma formats in video coding
US20220210448A1 (en) * 2019-09-14 2022-06-30 Bytedance Inc. Chroma quantization parameter in video coding

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11973959B2 (en) 2019-09-14 2024-04-30 Bytedance Inc. Quantization parameter for chroma deblocking filtering
US11985329B2 (en) 2019-09-14 2024-05-14 Bytedance Inc. Quantization parameter offset for chroma deblocking filtering
US11785260B2 (en) 2019-10-09 2023-10-10 Bytedance Inc. Cross-component adaptive loop filtering in video coding
US11622120B2 (en) 2019-10-14 2023-04-04 Bytedance Inc. Using chroma quantization parameter in video coding
US20220408093A1 (en) * 2019-11-05 2022-12-22 Lg Electronics Inc. Video decoding method and device for coding chroma quantization parameter offset-related information
US20220321882A1 (en) 2019-12-09 2022-10-06 Bytedance Inc. Using quantization groups in video coding
US11902518B2 (en) 2019-12-09 2024-02-13 Bytedance Inc. Using quantization groups in video coding
US11750806B2 (en) 2019-12-31 2023-09-05 Bytedance Inc. Adaptive color transform in video coding
US20220303586A1 (en) * 2021-03-19 2022-09-22 Tencent America LLC Adaptive Non-Linear Mapping for Sample Offset
US11683530B2 (en) * 2021-03-19 2023-06-20 Tencent America LLC Adaptive non-linear mapping for sample offset
US20230224503A1 (en) * 2021-03-19 2023-07-13 Tencent America LLC Adaptive Non-Linear Mapping for Sample Offset

Also Published As

Publication number Publication date
JP2022552338A (ja) 2022-12-15
KR20220073746A (ko) 2022-06-03
EP4029273A4 (fr) 2023-03-15
KR20220073745A (ko) 2022-06-03
CN114586370A (zh) 2022-06-03
CN114586370B (zh) 2024-01-23
EP4029273A1 (fr) 2022-07-20
WO2021076478A1 (fr) 2021-04-22
CN114556924A (zh) 2022-05-27
WO2021076475A1 (fr) 2021-04-22
CN114556924B (zh) 2024-01-26
JP2022552339A (ja) 2022-12-15
US11622120B2 (en) 2023-04-04
JP2024015130A (ja) 2024-02-01
US20220264122A1 (en) 2022-08-18
JP7443509B2 (ja) 2024-03-05
US20240107038A1 (en) 2024-03-28
EP4029264A1 (fr) 2022-07-20
EP4029264A4 (fr) 2022-11-23
CN117528080A (zh) 2024-02-06

Similar Documents

Publication Publication Date Title
US20220272347A1 (en) Joint coding of chroma residual and filtering in video processing
US11750806B2 (en) Adaptive color transform in video coding
US11973959B2 (en) Quantization parameter for chroma deblocking filtering
US20220248063A1 (en) Cross-component adaptive loop filtering in video coding
US11765368B2 (en) Cross-component adaptive loop filter
US20220385898A1 (en) Cross component adaptive loop filtering for video coding
US20220394248A1 (en) Deblocking filtering at coding block or subblock boundary
US20230291898A1 (en) Using quantization groups in video coding
US11985329B2 (en) Quantization parameter offset for chroma deblocking filtering
WO2021055896A1 (fr) Déblocage de chrominance dans un codage vidéo

Legal Events

Date Code Title Description
AS Assignment

Owner name: BYTEDANCE INC., CALIFORNIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ZHU, WEIJIA;ZHANG, LI;XU, JIZHENG;AND OTHERS;REEL/FRAME:059601/0993

Effective date: 20200904

STPP Information on status: patent application and granting procedure in general

Free format text: SPECIAL NEW

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: FINAL REJECTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED