WO2016049894A1 - Scaling in color transform - Google Patents

Scaling in color transform Download PDF

Info

Publication number
WO2016049894A1
WO2016049894A1 PCT/CN2014/088017 CN2014088017W WO2016049894A1 WO 2016049894 A1 WO2016049894 A1 WO 2016049894A1 CN 2014088017 W CN2014088017 W CN 2014088017W WO 2016049894 A1 WO2016049894 A1 WO 2016049894A1
Authority
WO
WIPO (PCT)
Prior art keywords
flag
xtby
ytby
residual
act
Prior art date
Application number
PCT/CN2014/088017
Other languages
French (fr)
Inventor
Kai Zhang
Jicheng An
Xianguo Zhang
Original Assignee
Mediatek 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 Mediatek Inc. filed Critical Mediatek Inc.
Priority to PCT/CN2014/088017 priority Critical patent/WO2016049894A1/en
Priority to EP15847504.6A priority patent/EP3189660B1/en
Priority to KR1020177010070A priority patent/KR102068828B1/en
Priority to KR1020207001441A priority patent/KR102115715B1/en
Priority to CN202111509061.7A priority patent/CN114554199B/en
Priority to PCT/CN2015/091275 priority patent/WO2016050219A1/en
Priority to CN202010541786.3A priority patent/CN111818334B/en
Priority to CN201580052679.1A priority patent/CN107079164B/en
Priority to CA2961681A priority patent/CA2961681C/en
Priority to US15/514,129 priority patent/US10455231B2/en
Publication of WO2016049894A1 publication Critical patent/WO2016049894A1/en
Priority to US16/564,042 priority patent/US10880547B2/en

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
    • H04N19/124—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
    • H04N19/169—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
    • H04N19/70—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
    • H04N19/46—Embedding additional information in the video signal during the compression process
    • H04N19/463—Embedding additional information in the video signal during the compression process by compressing encoding parameters before transmission

Definitions

  • the invention relates generally to video/image coding/processing. Particularly, it is related to adaptive color transform.
  • Adaptive color transform or namely in-loop color-space transform [1][2] is adopted into HEVC screen content coding (HEVC-SCC) extension and is described as follows.
  • Fig. 1 The decoding flow for the proposed in-loop color-space transform is depicted in Fig. 1.
  • the added module namely inverse color transform, is highlighted.
  • the inverse color transform is invoked to convert the residual domain back to the original domain.
  • a flag is signaled to indicate the usage of color-space transform in a CU.
  • intra BC and inter modes such a flag is signaled only when there is at least one non-zero coefficient in the current CU.
  • intra modes such a flag is signaled only when the chroma mode of the first PU (i. e., top-left PU within one CU) is coded with DM mode.
  • the forward and the inverse color-space transforms for lossy coding use the YCoCg transform matrices, which are defined as follows:
  • the original color space (C 0 , C 1 , C 2 ) may correspond to (R, G, B) or (Y, U, V) .
  • the forward color transform in lossy coding is not normalized, which results in signal decline when the transform is applied.
  • the norm of the forward transform is roughly equal to one quarter of square root of 6 for C 0 and C 2 , and half of square root of 2 for C 1 .
  • delta QPs of (-5, -3, -5) are used to compensate such decline for the three color components, respectively. That is, when the color-space transform is applied, the quantization parameter is set equal to (QP-5, QP-3, QP-5) for the three components, respectively, where QP is the 'normal' QP value for the CU. In the deblocking process, the normal QP value is used for all blocks.
  • QP represents quantization parameter here.
  • the quantization parameter qP is derived as follows:
  • cu_residual_act_flag [xTbY] [yTbY] is 1 if adaptive color transform is applied in the block with left-top position (xTbY, yTbY) . Otherwise, cu_residual_act_flag [xTbY] [yTbY] is 0.
  • Fig. 1 is a diagram illustrating the decoding flowchart of in-loop color-space transform scheme
  • Fig. 2 is a diagram illustrating the decoding flowchart of clipping on QP.
  • QP cannot be lower than 0.
  • (1) (2) (3) should be rewritten as
  • QP is clipped to a valid range as demonstrated in Fig. 2.
  • (1) (2) (3) should be rewritten as
  • MinQPY is set to be 0 and MaxQPY is set to be 51.
  • MinQPCb is set to be 0 and MaxQPCb is set to be 51.
  • MinQPCr is set to be 0 and MaxQPCr is set to be 51.
  • MinQPCb and/or MaxQPCb are set depending on MinQPY and/or MaxQPY.
  • MinQPCr and/or MaxQPCr are set depending on MinQPY and/or MaxQPY.
  • QP is calculated within a valid range by a function if adaptive color transform is used. For example, (1) (2) (3) should be rewritten as
  • the return value of fY, fCb and fCr must be larger or equal to 0.
  • fY (Qp′Y) (Qp′Y-5 + OffsetY1+OffsetY2) %OffsetY1.
  • fCb (Qp′Cb) (Qp′Cb-5 + OffsetCb1 + OffsetCb2) %OffsetCb1.
  • fCr (Qp′Cr) (Qp′Cr-3 + OffsetCr1+OffsetCr2) %OffsetCr1.
  • adaptive color transform should be turned off if (1) (2) or (3) incurs one or more qP ⁇ 0.
  • an embodiment of the present invention can be a circuit integrated into a video compression chip or program codes integrated into video compression software to perform the processing described herein.
  • An embodiment of the present invention may also be program codes to be executed on a Digital Signal Processor (DSP) to perform the processing described herein.
  • DSP Digital Signal Processor
  • the invention may also involve a number of functions to be performed by a computer processor, a digital signal processor, a microprocessor, or field programmable gate array (FPGA) .
  • processors can be configured to perform particular tasks according to the invention, by executing machine-readable software code or firmware code that defines the particular methods embodied by the invention.
  • the software code or firmware codes may be developed in different programming languages and different format or style.
  • the software code may also be compiled for different target platform.
  • different code formats, styles and languages of software codes and other means of configuring code to perform the tasks in accordance with the invention will not depart from the spirit and scope of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

A method for scaling in color transform is provided, in which the quantization parameter (QP) is constrained in a valid range if adaptive color transform is used, wherein the QP cannot be lower than 0, and QP is clipped to a valid range. This method can be used in a video encoder as well as in a video decoder.

Description

SCALING IN COLOR TRANSFORM TECHNICAL FIELD
The invention relates generally to video/image coding/processing. Particularly, it is related to adaptive color transform.
BACKGROUND
Adaptive color transform, or namely in-loop color-space transform [1][2] is adopted into HEVC screen content coding (HEVC-SCC) extension and is described as follows.
The decoding flow for the proposed in-loop color-space transform is depicted in Fig. 1. The added module, namely inverse color transform, is highlighted. When one block is coded with color transform enabled, after the conventional inverse DCT/DST transform and CCP, the inverse color transform is invoked to convert the residual domain back to the original domain. A flag is signaled to indicate the usage of color-space transform in a CU. For intra BC and inter modes, such a flag is signaled only when there is at least one non-zero coefficient in the current CU. For intra modes, such a flag is signaled only when the chroma mode of the first PU (i. e., top-left PU within one CU) is coded with DM mode.
Two different color-space transforms are applied depending on whether the CU is coded losslessly or in a lossy manner. The forward and the inverse color-space transforms for lossy coding use the YCoCg transform matrices, which are defined as follows:
Forward:
Figure PCTCN2014088017-appb-000001
 Inverse:
Figure PCTCN2014088017-appb-000002
wherein the original color space (C0, C1, C2) may correspond to (R, G, B) or (Y, U, V) .
The forward color transform in lossy coding is not normalized, which results in signal decline when the transform is applied. Considering that the norm of the  forward transform is roughly equal to one quarter of square root of 6 for C0 and C2, and half of square root of 2 for C1, delta QPs of (-5, -3, -5) are used to compensate such decline for the three color components, respectively. That is, when the color-space transform is applied, the quantization parameter is set equal to (QP-5, QP-3, QP-5) for the three components, respectively, where QP is the 'normal' QP value for the CU. In the deblocking process, the normal QP value is used for all blocks.
QP represents quantization parameter here.
In the specification of HEVC-SCC, the QP is adjusted as described in sub-clause 8.6.2:
The quantization parameter qP is derived as follows:
–If cIdx is equal to 0,
qP ＝ Qp′Y + (cu_residual_act_flag [xTbY] [yTbY] ？ -5 : 0)    (1)
–Otherwise, if cIdx is equal to 1,
qP ＝ Qp′Cb + (cu_residual_act_flag [xTbY] [yTbY] ？ -5 : 0)    (2)
–Otherwise (cIdx is equal to 2) ,
qP ＝ Qp′Cr + (cu_residual_act_flag [xTbY] [yTbY] ？ -3 : 0)    (3)
where cu_residual_act_flag [xTbY] [yTbY] is 1 if adaptive color transform is applied in the block with left-top position (xTbY, yTbY) . Otherwise, cu_residual_act_flag [xTbY] [yTbY] is 0.
However, the scaling process controlled by QP is defined in sub-clause 8.6.3: d [x] [y] ＝
Clip3 (coeffMin, coeffMax, ( (TransCoeffLevel [xTbY] [yTbY] [cIdx] [x] [y] *m [x] [y] * levelScale [qP％6] << (qP/6) ) + (1 << (bdShift-1) ) ) >> bdShift)          (4)
And The list levelScale [] is specified as levelScale [k] ＝ {40, 45, 51, 57, 64, 72} with k ＝ 0..5.
It is obvious that the calculation of d [x] [y] is undefined in equation (4) when qP < 0. However, the qP adjustment in equation (1) (2) (3) may incur a qP which is lower than 0 if adaptive color transform is applied.
SUMMARY
In light of the previously described problems, methods are proposed to signal  the palette table correctly and efficiently.
Other aspects and features of the invention will become apparent to those with ordinary skill in the art upon review of the following descriptions of specific embodiments.
BRIEF DESCRIPTION OF DRAWINGS
The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:
Fig. 1 is a diagram illustrating the decoding flowchart of in-loop color-space transform scheme；
Fig. 2 is a diagram illustrating the decoding flowchart of clipping on QP.
DETAILED DESCRIPTION
The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.
In order to guaratee that the QP is in a valid range when adaptive color transform is applied, we propose several methods for QP adjustment.
In one embodiemtn, QP cannot be lower than 0. For example, (1) (2) (3) should be rewritten as
qP ＝ Max (0 , Qp′Y + (cu_residual_act_flag [xTbY] [yTbY] ？ -5 : 0) )    (1)
qP ＝ Max (0, Qp′Cb + (cu_residual_act_flag [xTbY] [yTbY] ？ -5 : 0) )    (2)
qP ＝ Max (0, Qp′Cr + (cu_residual_act_flag [xTbY] [yTbY] ？ -3 : 0) )    (3)
In another embodiment, QP is clipped to a valid range as demonstrated in Fig. 2. For example, (1) (2) (3) should be rewritten as
qP ＝ Clip3 (MinQPY , MaxQPY,
Qp′Y + (cu_residual_act_flag [xTbY] [yTbY] ？ -5 : 0) )    (1)
qP ＝ Clip3 (MinQPCb , MaxQPCb,
Qp′Cb + (cu_residual_act_flag [xTbY] [yTbY] ？ -5 : 0) )    (2)
qP ＝ Clip3 (MinQPCr , MaxQPCr,
Qp′Cr + (cu_residual_act_flag [xTbY] [yTbY] ？ -3 : 0) )    (3)
In one example, MinQPY is set to be 0 and MaxQPY is set to be 51.
In one example, MinQPCb is set to be 0 and MaxQPCb is set to be 51.
In one example, MinQPCr is set to be 0 and MaxQPCr is set to be 51.
In one example, MinQPCb and/or MaxQPCb are set depending on MinQPY and/or MaxQPY.
In one example, MinQPCr and/or MaxQPCr are set depending on MinQPY and/or MaxQPY.
In still another embodiment, QP is calculated within a valid range by a function if adaptive color transform is used. For example, (1) (2) (3) should be rewritten as
qP ＝ cu_residual_act_flag [xTbY] [yTbY] ？ fY (Qp′Y ) : Qp′Y)    (1)
qP ＝ cu_residual_act_flag [xTbY] [yTbY] ？ fCb (Qp′Cb) : Qp′Cb)    (2)
qP ＝ cu_residual_act_flag [xTbY] [yTbY] ？ fCr (Qp′Cr) : Qp′Cr)    (3)
The return value of fY, fCb and fCr must be larger or equal to 0.
In one example, fY (Qp′Y) ＝ (Qp′Y-5 + OffsetY1+OffsetY2) ％OffsetY1.
In one example, fCb (Qp′Cb) ＝ (Qp′Cb-5 + OffsetCb1 + OffsetCb2) ％OffsetCb1.
In one example, fCr (Qp′Cr) ＝ (Qp′Cr-3 + OffsetCr1+OffsetCr2) ％OffsetCr1.
In one example, OffsetY1 ＝ OffsetCb1 ＝ OffsetCr1 ＝51.
In still another embodiment, it is an encoder constraint that QP should not be lower than 0. If (1) (2) or (3) incurs one or more qP< 0, the bit-stream is considered as illegal.
In still another embodiment, adaptive color transform should be turned off if (1) (2) or (3) incurs one or more qP< 0.
The methods described above can be used in a video encoder as well as in a video decoder. Embodiments of disparity vector derivation methods according to the present invention as described above may be implemented in various hardware, software codes, or a combination of both. For example, an embodiment of the present invention can be a circuit integrated into a video compression chip or program codes integrated into video compression software to perform the processing described herein. An embodiment of the present invention may also be program codes to be executed  on a Digital Signal Processor (DSP) to perform the processing described herein. The invention may also involve a number of functions to be performed by a computer processor, a digital signal processor, a microprocessor, or field programmable gate array (FPGA) . These processors can be configured to perform particular tasks according to the invention, by executing machine-readable software code or firmware code that defines the particular methods embodied by the invention. The software code or firmware codes may be developed in different programming languages and different format or style. The software code may also be compiled for different target platform. However, different code formats, styles and languages of software codes and other means of configuring code to perform the tasks in accordance with the invention will not depart from the spirit and scope of the invention.
The invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The described examples are to be considered in all respects only as illustrative and not restrictive. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art) . Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
REFERENCES
[1] L. Zhang, J. Chen, J. Sole, M. Karczewicz, “AhG8: In-loop color-space transform, ” JCTVC-Q0112, Apr. 2014.
[2] L. Zhang, J. Chen, J. Sole, M. Karczewicz, X. Xiu, Y. He, Y. Ye, “SCCE5 Test 3.2.1: In-loop color-space transform, ” JCTVC-R0147, Jul. 2014.
[3] R. Joshi, J. Xu, “HEVC Screen Content Coding Draft Text 1” , JCTVC-R1005, Jul. 2014. 

Claims (20)

  1. A method guarateeing that the QP is in a valid range when adaptive color transform is applied.
  2. The method as claimed in claim 1, wherein QP cannot be lower than 0.
  3. The method as claimed in claim 2, wherein
    qP＝ Max (0 , Qp′Y + (cu_residual_act_flag [xTbY] [yTbY] ？ -5 : 0) ) ,
    qP＝ Max (0, Qp′Cb + (cu_residual_act_flag [xTbY] [yTbY] ？ -5 : 0) ) ,
    qP ＝ Max (0, Qp′Cr + (cu_residual_act_flag [xTbY] [yTbY] ？ -3 : 0) ) .
  4. The method as claimed in claim 1, wherein QP is clipped to a valid range.
  5. The method as claimed in claim 4, wherein
    qP ＝ Clip3 (MinQPY , MaxQPY,
    Qp′Y + (cu_residual_act_flag [xTbY] [yTbY] ？ -5 : 0) ) ,
    qP ＝ Clip3 (MinQPCb , MaxQPCb,
    Qp′Cb + (cu_residual_act_flag [xTbY] [yTbY] ？ -5 : 0) ) ,
    qP ＝ Clip3 (MinQPCr , MaxQPCr,
    Qp′Cr + (cu_residual_act_flag [xTbY] [yTbY] ？ -3 : 0) ) .
  6. The method as claimed in claim 5, wherein MinQPY is set to be 0 and MaxQPY is set to be 51.
  7. The method as claimed in claim 5, wherein MinQPCr is set to be 0 and MaxQPCr is set to be 51.
  8.  The method as claimed in claim 5, wherein MinQPCb is set to be 0 and MaxQPCb is set to be 51.
  9. The method as claimed in claim 5, wherein MinQPCb and/or MaxQPCb are set depending on MinQPY and/or MaxQPY.
  10. The method as claimed in claim 5, wherein MinQPCr and/or MaxQPCr are set depending on MinQPY and/or MaxQPY.
  11. The method as claimed in claim 1, wherein QP is calculated within a valid range by a function if adaptive color transform is used.
  12. The method as claimed in claim 11, wherein
    qP ＝ cu_residual_act_flag [xTbY] [yTbY] ？ fY (Qp′Y) : Qp′Y) ,
    qP ＝ cu_residual_act_flag [xTbY] [yTbY] ？ fCb (Qp′Cb) : Qp′Cb ) ,
    qP ＝ cu_residual_act_flag [xTbY] [yTbY] ？ fCr (Qp′Cr) : Qp′Cr) .
  13. The method as claimed in claim 12, wherein the return value of fY, fCb and fCr must be larger or equal to 0.
  14. The method as claimed in claim 12, wherein fY (Qp′Y) ＝ (Qp′Y-5 + OffsetY1+OffsetY2) ％OffsetY1.
  15. The method as claimed in claim 12, wherein fCb (Qp′Cb) ＝ (Qp′Cb-5 + OffsetCb1+OffsetCb2) ％OffsetCb1.
  16. The method as claimed in claim 12, wherein fCr (Qp′Cr) ＝ (Qp′Cr-3 + OffsetCr1+OffsetCr2) ％OffsetCr1.
  17. The method as claimed in claim 14-16, wherein OffsetY1 ＝ OffsetCb1 ＝ OffsetCr1 ＝ 51.
  18. The method as claimed in claim 1, wherein it is an encoder constraint that QP should not be lower than 0.
  19. The method as claimed in claim 18, wherein the bit-stream is considered as illegal if (1) (2) or (3) incurs one or more qP< 0.
  20. The method as claimed in claim 1, wherein adaptive color transform should be turned off if (1) (2) or (3) incurs one or more qP< 0.
PCT/CN2014/088017 2014-09-30 2014-09-30 Scaling in color transform WO2016049894A1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
PCT/CN2014/088017 WO2016049894A1 (en) 2014-09-30 2014-09-30 Scaling in color transform
PCT/CN2015/091275 WO2016050219A1 (en) 2014-09-30 2015-09-30 Method of adaptive motion vetor resolution for video coding
KR1020177010070A KR102068828B1 (en) 2014-09-30 2015-09-30 Method of adaptive motion vector resolution for video coding
KR1020207001441A KR102115715B1 (en) 2014-09-30 2015-09-30 Method of adaptive motion vector resolution for video coding
CN202111509061.7A CN114554199B (en) 2014-09-30 2015-09-30 Method for adaptive motion vector resolution for video coding
EP15847504.6A EP3189660B1 (en) 2014-09-30 2015-09-30 Method of adaptive motion vector resolution for video coding
CN202010541786.3A CN111818334B (en) 2014-09-30 2015-09-30 Method for adaptive motion vector resolution for video coding
CN201580052679.1A CN107079164B (en) 2014-09-30 2015-09-30 Method for adaptive motion vector resolution for video coding
CA2961681A CA2961681C (en) 2014-09-30 2015-09-30 Method of adaptive motion vetor resolution for video coding
US15/514,129 US10455231B2 (en) 2014-09-30 2015-09-30 Method of adaptive motion vector resolution for video coding
US16/564,042 US10880547B2 (en) 2014-09-30 2019-09-09 Method of adaptive motion vector resolution for video coding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/088017 WO2016049894A1 (en) 2014-09-30 2014-09-30 Scaling in color transform

Publications (1)

Publication Number Publication Date
WO2016049894A1 true WO2016049894A1 (en) 2016-04-07

Family

ID=55629321

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2014/088017 WO2016049894A1 (en) 2014-09-30 2014-09-30 Scaling in color transform

Country Status (1)

Country Link
WO (1) WO2016049894A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021121419A1 (en) * 2019-12-19 2021-06-24 Beijing Bytedance Network Technology Co., Ltd. Interaction between adaptive color transform and quantization parameters
WO2021136555A1 (en) * 2020-01-05 2021-07-08 Beijing Bytedance Network Technology Co., Ltd. Use of offsets with adaptive colour transform coding tool
US11943439B2 (en) 2020-01-18 2024-03-26 Beijing Bytedance Network Technology Co., Ltd. Adaptive colour transform in image/video coding

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1829326A (en) * 2005-03-04 2006-09-06 三星电子株式会社 Color space scalable video coding and decoding method and apparatus for the same
CN1973547A (en) * 2004-06-18 2007-05-30 汤姆逊许可公司 Method and apparatus for video codec quantization
CN101461248A (en) * 2006-06-09 2009-06-17 汤姆森许可贸易公司 Method and apparatus for adaptively determining a bit budget for encoding video pictures
US20130070845A1 (en) * 2009-08-07 2013-03-21 Korea Advanced Institute Of Science And Technology Motion picture encoding apparatus and method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1973547A (en) * 2004-06-18 2007-05-30 汤姆逊许可公司 Method and apparatus for video codec quantization
CN1829326A (en) * 2005-03-04 2006-09-06 三星电子株式会社 Color space scalable video coding and decoding method and apparatus for the same
CN101461248A (en) * 2006-06-09 2009-06-17 汤姆森许可贸易公司 Method and apparatus for adaptively determining a bit budget for encoding video pictures
US20130070845A1 (en) * 2009-08-07 2013-03-21 Korea Advanced Institute Of Science And Technology Motion picture encoding apparatus and method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021121419A1 (en) * 2019-12-19 2021-06-24 Beijing Bytedance Network Technology Co., Ltd. Interaction between adaptive color transform and quantization parameters
US11863715B2 (en) 2019-12-19 2024-01-02 Beijing Bytedance Network Technology Co., Ltd Joint use of adaptive colour transform and differential coding of video
WO2021136555A1 (en) * 2020-01-05 2021-07-08 Beijing Bytedance Network Technology Co., Ltd. Use of offsets with adaptive colour transform coding tool
US11838523B2 (en) 2020-01-05 2023-12-05 Beijing Bytedance Network Technology Co., Ltd. General constraints information for video coding
US11943439B2 (en) 2020-01-18 2024-03-26 Beijing Bytedance Network Technology Co., Ltd. Adaptive colour transform in image/video coding

Similar Documents

Publication Publication Date Title
CA2961681C (en) Method of adaptive motion vetor resolution for video coding
JP2022020638A (en) Method and device for deblocking filtering pixel block
WO2017045580A1 (en) Method and apparatus of advanced de-blocking filter in video coding
US10136033B2 (en) Techniques for advanced chroma processing
US20150382016A1 (en) Method for Processing Multi-Component Video and Images
WO2015090217A1 (en) Method and apparatus for palette table prediction
KR20160033790A (en) Chroma quantization parameter extension
EP4018650A1 (en) Cross-component adaptive loop filter for chroma
WO2016049894A1 (en) Scaling in color transform
CN108141601B (en) Method, apparatus and readable medium for encoding and decoding a sequence of pictures
EP2834980A2 (en) Sample adaptive filtering with offsets
WO2013102299A1 (en) Residue quad tree depth for chroma components
US20230023387A1 (en) Low complexity image filter
WO2015192372A1 (en) A simplified method for illumination compensation in multi-view and 3d video coding
US20230388550A1 (en) Method and apparatus for adaptively processing video samples in a video signal frame
WO2016115728A1 (en) Improved escape value coding methods
US20220417530A1 (en) Image decoding device, image decoding method, and program
WO2016065538A1 (en) Guided cross-component prediction
WO2016054774A1 (en) A method for the co-existence of color-space transform and cross-component prediction
KR20200138760A (en) Predictive image correction device, image coding device, image decoding device, and program
JP2015130616A (en) Image encoding device and program, image decoding device and program, and image encoding system
WO2021131463A1 (en) Image decoding device, image decoding method, and program
WO2016070363A1 (en) Merge with inter prediction offset
WO2015100732A1 (en) A padding method for intra block copying
WO2016183814A1 (en) Coded block flag coding using cross-component correlation

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14903074

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 14903074

Country of ref document: EP

Kind code of ref document: A1