Joint Collaborative Team on Video Coding (jct-vc)


Proposal: JCTVC-T0111 X-check



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Proposal: JCTVC-T0111

  • X-check: JCTVC-T0130

    This proposal introduces a constraint on the string length of ISC (compared to the basis software) to reduce worst-case memory access bandwidth. The minimum string length applied is of 4 pixels.
    Test B4.2: Memory Bandwidth Reduction II

    • Proposal: JCTVC-T0136

    • X-check: JCTVC-T0179

    This test is performed on top of Test B2 (Pseudo 2D Matching Mode). It additionally introduces a constraint on the string length of ISC to reduce worst-case memory access bandwidth. The minimum string length applied is of 20 pixels, but such constraint is applied only when part of the reference pixels of a string overlap with the reconstructed pixels lying outside of 2-CTU search range.

    Syntax design and matching criterion used in this test are different from Test B4.1.

    Vertical scanning is enabled in this test.
    Test B5: Entropy Coding ISC Syntax Elements


    • Proposal: JCTVC-T0128

    • X-check: JCTVC-T0115

    A universal entropy coding scheme is applied to the coding of dictionary_pred_length_minus1, dictionay_pred_offset_minus1, and dictionay_pred_offsetX, dictionay_pred_offsetY.

    Test B6: Pixel Based Flexible 2D Block Coding (F2D) harmonized with Intra String Copy (ISC)

    Withdrawn.


    Test B7: 1-D Matching

    • Proposal: JCTVC-T0041

    • X-check: ???

    The 1-D matching dictionary mode is tested on top of the 2D matching dictionary mode. Only the pixels that are coded by using the 1-D matching mode are stored in the dictionary (unless the number of stored pixels exceeds the pre-defined dictionary size) and can serve as reference pixels for prediction.
    Results of Test B

    • Test Condition 1 (equivalent to test A1)

    • Anchor: 1x2 CTUs for 4x4/8x4 IBC and FF for 4x8/8x8/16x16/32x32 IBC

    • Test : 1x2 CTUs for ISC and ILC




    Lossy Coding

    All Intra

    A1

    ILC


    CE SW Hor. ISC

    B1.1*

    H/V-ISC


    B1.2**

    H-F2D


    B2*

    P2D


    B3**

    H/V-F2D


    B4.1

    4x1 Str.


    B4.2*

    1x20 Str.



    B5

    Entropy


    B7

    1D Match


    RGB, TGM, 1080p & 720p

    −2.0%

    −0.3%

    −0.9%




    −1.4%




    −0.3%

    Same as B.2

    −0.6%

    −0.8%

    RGB, MC, 1440p & 1080p

    −1.6%

    0.0%

    −0.1%




    −0.6%




    0.0%

    0.0%

    0.0%

    RGB, Animation, 720p

    0.0%

    0.0%

    0.0%




    0.0%




    0.0%

    0.0%

    0.0%

    RGB, Camera, 1080p

    0.0%

    0.0%

    0.0%




    0.0%




    0.0%

    0.0%

    0.0%

    YUV, TGM, 1080p & 720p

    −1.8%

    −0.3%

    −0.8%




    −1.4%




    −0.2%

    −0.5%

    −0.7%

    YUV, MC, 1440p & 1080p

    −1.5%

    0.0%

    −0.1%




    −0.6%




    0.0%

    0.0%

    0.0%

    YUV, Animation, 720p

    0.0%

    0.1%

    0.1%




    0.1%




    0.1%

    0.1%

    0.1%

    YUV, Camera, 1080p

    0.0%

    0.1%

    0.1%




    0.0%




    0.0%

    0.0%

    0.1%

    Enc Time[%]

    115%

    152%

    173%




    218%




    134%

    --

    139%

    171%

    Dec Time[%]

    101%

    108%

    110%




    107%




    103%

    --

    99%

    106%

    Lossy Coding

    Random Access

    A1

    ILC


    CE SW Hor. ISC

    B1.1*

    H/V-ISC


    B1.2**

    H-F2D


    B2*

    P2D


    B3**

    H/V-F2D


    B4.1

    4x1 Str.


    B4.2*

    1x20 Str.



    B5

    Entropy


    B7

    1D Match


    RGB, TGM, 1080p & 720p

    −1.2%

    −0.1%

    −0.5%




    −0.9%




    −0.1%

    Same as B.2

    −0.3%

    −0.6%

    RGB, MC, 1440p & 1080p

    −1.1%

    0.1%

    0.0%




    −0.4%




    0.1%

    0.0%

    −0.1%

    RGB, Animation, 720p

    0.0%

    0.1%

    0.1%




    0.1%




    0.1%

    0.1%

    0.1%

    RGB, Camera, 1080p

    0.0%

    0.0%

    0.0%




    0.0%




    0.0%

    0.0%

    0.0%

    YUV, TGM, 1080p & 720p

    −1.1%

    −0.1%

    −0.4%




    −0.8%




    −0.1%

    −0.2%

    −0.5%

    YUV, MC, 1440p & 1080p

    −1.1%

    0.1%

    0.0%




    −0.4%




    0.1%

    0.1%

    0.0%

    YUV, Animation, 720p

    0.0%

    0.1%

    0.1%




    0.1%




    0.0%

    0.1%

    0.0%

    YUV, Camera, 1080p

    0.0%

    0.1%

    0.1%




    0.1%




    0.1%

    0.1%

    0.0%

    Enc Time[%]

    107%

    128%

    123%




    141%




    111%

    --

    112%

    133%

    Dec Time[%]

    100%

    111%

    110%




    109%




    103%

    --

    94%

    114%

    Lossy Coding

    Low Delay B

    A1

    ILC


    CE SW Hor. ISC

    B1.1*

    H/V-ISC


    B1.2**

    H-F2D


    B2*

    P2D


    B3**

    H/V-F2D


    B4.1

    4x1 Str.


    B4.2*

    1x20 Str.



    B5

    Entropy


    B7

    1D Match


    RGB, TGM, 1080p & 720p

    −0.6%

    0.0%

    −0.2%




    −0.4%




    0.0%

    Same as B.2

    −0.1%

    −0.1%

    RGB, MC, 1440p & 1080p

    −0.6%

    0.0%

    −0.1%




    −0.3%




    0.1%

    0.1%

    0.1%

    RGB, Animation, 720p

    0.0%

    0.1%

    0.1%




    0.1%




    0.0%

    0.1%

    0.1%

    RGB, Camera, 1080p

    0.0%

    0.1%

    0.1%




    0.1%




    0.1%

    0.1%

    0.1%

    YUV, TGM, 1080p & 720p

    −0.5%

    0.0%

    0.0%




    −0.3%




    0.0%

    −0.1%

    −0.1%

    YUV, MC, 1440p & 1080p

    −0.5%

    0.0%

    0.0%




    −0.5%




    0.0%

    −0.1%

    −0.1%

    YUV, Animation, 720p

    −0.1%

    0.3%

    0.2%




    0.1%




    0.3%

    0.2%

    0.2%

    YUV, Camera, 1080p

    0.0%

    0.0%

    0.0%




    0.0%




    0.0%

    0.0%

    0.0%

    Enc Time[%]

    102%

    115%

    117%




    121%




    108%

    --

    108%

    121%

    Dec Time[%]

    102%

    107%

    115%




    110%




    106%

    --

    100%

    118%

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