GB2591379A - Single-line cross component linear model prediction mode - Google Patents

Single-line cross component linear model prediction mode Download PDF

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Publication number
GB2591379A
GB2591379A GB2103284.2A GB202103284A GB2591379A GB 2591379 A GB2591379 A GB 2591379A GB 202103284 A GB202103284 A GB 202103284A GB 2591379 A GB2591379 A GB 2591379A
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Prior art keywords
samples
luma
luma samples
video
downsampling
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GB2103284.2A
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GB2591379B (en
GB202103284D0 (en
Inventor
Zhang Kai
Zhang Li
Liu Hongbin
Wang Yue
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Beijing ByteDance Network Technology Co Ltd
ByteDance Inc
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Beijing ByteDance Network Technology Co Ltd
ByteDance Inc
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Priority claimed from CN201810005182.XA external-priority patent/CN109994601B/en
Application filed by Beijing ByteDance Network Technology Co Ltd, ByteDance Inc filed Critical Beijing ByteDance Network Technology Co Ltd
Priority claimed from PCT/IB2019/057699 external-priority patent/WO2020053805A1/en
Publication of GB202103284D0 publication Critical patent/GB202103284D0/en
Publication of GB2591379A publication Critical patent/GB2591379A/en
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    • 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
    • H04N19/102—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
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
    • 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
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/11—Selection of coding mode or of prediction mode among a plurality of spatial predictive coding modes
    • 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
    • H04N19/169—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
    • H04N19/184—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 bits, e.g. of the compressed video stream
    • 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
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/59—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
    • 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
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
    • 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
    • H04N19/80—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
    • 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
    • H04N19/80—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
    • H04N19/82—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation involving filtering within a prediction loop

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

Abstract

Devices, systems and methods for digital video coding, which includes cross-component prediction, are described. In a representative aspect, a method for video coding includes receiving a bitstream representation of a current block of video data comprising a luma component and a chroma component, determining parameters of a linear model based on a first set of samples that are generated by down-sampling a second set of samples of the luma component, and processing, based on the parameters of the linear model, the bitstream representation to generate the current block.

Claims (31)

1. A method of video processing, comprising: generating downsampled outside luma samples corresponding to chroma samples outside a chroma block of a video using a first downsampling scheme; generating downsampled inside luma samples corresponding to chroma samples inside the chroma block using a second downsampling scheme; at least using the downsampled outside luma samples to derive a linear model for cross component prediction; determining predicted samples for the chroma block using the linear model and the downsampled inside luma samples; and performing a conversion between the video and a coded representation of the video using the predicted samples for the chroma block.
2. The method of claim 1, wherein the first downsampling scheme corresponds to downsampling outside above luma samples to lower left and/or lower right positions.
3. The method of claims 1 or 2, wherein the first downsampling scheme corresponds to downsampling outside luma samples to lower left positions.
4. The method of claim 3, wherein the first downsampling scheme calculates downsampled luma samples d[i] from above adjacent luma samples a[i] as d[i] = (a[2i-l]+2*a[2i]+a[2i+l]+2)>>2 in a case that all a samples are available, or d[i] = (3*a[2i]+a[2i+l]+2)>>2 in a case that a[2i-l] is unavailable, or d[i] = (3*a[2i]+a[2i-l]+2)>>2 in a case that a[2i+l] is unavailable.
5. The method of claim 3, wherein the first downsampling scheme calculates downsampled luma samples d[i] from above adjacent luma samples a[i] as d[i]=(a[2i-l]+2*a[2i]+a[2i+l]+offset0)>>2, for i > 0 and one of d[i]=(3*a[2i]+a[2i+l]+ offsetl)>>2, or d[i]= a[2i], or d[i]=(a[2i]+a[2i+l]+offset2)>>l , for i= 0, where offsetO, offsetl and offset2 are fractions.
6. The method of claim 5, wherein offsetO = offsetl = 2 and offset2 = 1.
7. The method of claim 1, wherein the first downsampling scheme corresponds to downsampling outside left luma samples to lower right and/or upper right positions.
8. The method of claim 1, wherein the first downsampling scheme corresponds to downsampling outside left luma samples to halfway between lower right and upper right positions.
9. The method of claim 8, wherein a downsampled luma samples d[i] is calculated as: d[j] = (a[2j]+a[2j+l]+l)»2.
10. The method of claim 1, wherein the chroma block has a width W and a height of H pixels, and wherein the first downsampling scheme generates N*W luma samples, where N is an integer.
11. The method of claim 10, wherein N = 2, and wherein the first downsampling scheme generates luma samples from above adjacent luma samples.
12. The method of claim 1, wherein the chroma block has a width W and a height of H pixels, and wherein the first downsampling scheme generates W + K luma downsampled samples from above adjacent luma samples, where K is a positive integer.
13. The method of claim 1, wherein the chroma block has a width W and a height of H pixels, and wherein the first downsampling scheme generates W/N luma downsampled samples from above adjacent luma samples, where N is a positive integer.
14. The method of claim 1, wherein the chroma block has a width W and a height of H pixels, and wherein the first downsampling scheme generates W*N luma downsampled samples from left adjacent luma samples, where N is a positive integer.
15. The method of claim 1, wherein the chroma block has a width W and a height of H pixels, and wherein the first downsampling scheme generates W + K luma downsampled samples from left adjacent luma samples, where K is a positive integer.
16. The method of claim 1, wherein the chroma block has a width W and a height of H pixels, and wherein the first downsampling scheme generates W/N luma downsampled samples from left adjacent luma samples, where N is a positive integer.
17. The method of claim 1, wherein the first downsampling scheme or the second downsampling scheme is determined based on a position of a chroma block of a video meeting a position criterion.
18. The method of any of claims 1-16, wherein the position criterion specifies to use the method for only video blocks at a top boundary of a coding tree unit of the video.
19. The method of any of claims 1-16, wherein the position criterion specifies to use the method for only video blocks at a left boundary of a coding tree unit of the video.
20. The method of any of claims 1-16, wherein the position criterion specifies to use the method for only video blocks at a top boundary of a coding tree unit of the video or video blocks at a left boundary of a coding tree unit of the video.
21. The method of any of claims 1 -20, wherein the first downsampling scheme uses only one above neighboring luma samples row to derive the downsampled outside luma samples.
22. The method of claim 21, wherein the one above neighboring luma samples row comprises above neighboring samples and above-right neighboring samples.
23. A method for video processing, comprising: determining, for a conversion between a chroma block of a video and a coded representation of the video, a linear model; generating prediction values of the chroma block from a luma block that corresponds to the chroma block based on the linear model; and performing the conversion using the linear model; wherein the predicting the chroma block from the luma block includes downsampling luma samples above the luma block by a first filtering method and dowsampling luma samples to left of the luma block by a second filtering method, and wherein the linear model is determined at least based on the downsampled luma samples.
24. The method of claim 23, wherein the first filtering method uses only luma samples of a single above neighboring luma row during the conversion of the video.
25. The method of claim 23, wherein the first filtering method is different than the second filtering method.
26. The method of any of claims 23-25, wherein the first filtering method uses a horizontal three-tap filter.
27. The method of any of claims 23-26, wherein the second filtering method uses a 2-d 6 tap filter.
28. The method of any of claims 1-27, wherein the conversion comprises generating the video from the coded representation.
29. The method of any of claims 1-27, wherein the conversion comprises generating the coded representation from the video.
30. A video processing apparatus comprising a processor configured to implement a method recited in any one or more of claims 1-29.
31. A computer-readable program medium having code stored thereupon, the code, when executed by a processor, causing the processor to implement a method recited in any one or more of claims 1-29.
GB2103284.2A 2018-01-03 2019-09-12 Single-line cross component linear model prediction mode Active GB2591379B (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201810005182.XA CN109994601B (en) 2018-01-03 2018-01-03 Method for manufacturing magnetic random access memory circuit connection
CN201810008681 2018-09-29
CN2019088005 2019-05-22
PCT/IB2019/057699 WO2020053805A1 (en) 2018-09-12 2019-09-12 Single-line cross component linear model prediction mode

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GB2591379A true GB2591379A (en) 2021-07-28
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120287995A1 (en) * 2011-05-12 2012-11-15 Madhukar Budagavi Luma-Based Chroma Intra-Prediction for Video Coding
GB2495942A (en) * 2011-10-25 2013-05-01 Canon Kk Prediction of Image Components Using a Prediction Model
US20180077426A1 (en) * 2016-09-15 2018-03-15 Qualcomm Incorporated Linear model chroma intra prediction for video coding

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120287995A1 (en) * 2011-05-12 2012-11-15 Madhukar Budagavi Luma-Based Chroma Intra-Prediction for Video Coding
GB2495942A (en) * 2011-10-25 2013-05-01 Canon Kk Prediction of Image Components Using a Prediction Model
US20180077426A1 (en) * 2016-09-15 2018-03-15 Qualcomm Incorporated Linear model chroma intra prediction for video coding

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHEN H ET AL, "Description of SDR, HDR and 360° video coding technology proposal by Huawei, GoPro, HiSilicon, and Samsung "" general application scenario", 10. JVET MEETING; 10-4-2018 - 20-4-2018; SAN DIEGO; (THE JOINT VIDEO EXPLORATION TEAM OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ); URL: HTTP://P *
VAN DER AUWERA (QUALCOMM) G ET AL, "Description of Core Experiment 3 (CE3): Intra Prediction and Mode Coding", no. JVET-J1023, (20180621), 10. JVET MEETING; 20180410 - 20180420; SAN DIEGO; (THE JOINT VIDEO EXPLORATION TEAM OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ),, URL: http://phenix.int-evry.fr/ *

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