Encoder, a decoder and corresponding methods of complexity reduction on intra prediction for the planar mode

Patent metadata

Field	Value
Publication number	US-12063388-B2
Application number	US-202217850123-A
Country	US
Kind code	B2
Filing date	Jun 27, 2022
Priority date	Sep 23, 2019
Publication date	Aug 13, 2024
Grant date	Aug 13, 2024

Abstract

A method of coding implemented is provided. The method includes the following operations: obtained the height and width of a prediction block without applying clipping operation; calculating a value of a vertical component of an intra prediction sample based on the height and width of the prediction block; calculating a value of a horizontal component of the intra prediction sample based on the height and width of the prediction block; and generating the intra prediction sample based on the value of the vertical component and the value of the horizon component.

First claim

What is claimed is:

1. A method of intra Planar prediction, comprising:
obtaining a height and a width of a current block;
calculating a value of a vertical component of an intra prediction sample based on the height and the width;
calculating a value of a horizontal component of the intra prediction sample based on the width and the height;
when the width of the current block is equal to 1, the value of the vertical component and the value of the horizontal component satisfy:
pred V[x][y ]=(( nTbH− 1− y )* p[x][− 1]+( y+ 1)* p[− 1 ][nTbH ])

pred H[x][y ]=(( x+ 1)* p[nTbW][− 1])<<Log 2( nTbH ),

wherein predV[x][y] represents the vertical component, predH[x][y] represents the horizontal component, nTbH represents the height of the current block, nTbW represents the width of the current block, p[x][y] represents neighbouring samples with x=−1, y=−1 . . . nTbH and x=0 . . . nTbW, y=−1; and
generating the intra prediction sample based on the value of the vertical component and the value of the horizontal component.

2. The method of claim 1 , wherein the intra prediction sample predSamples[x][y] satisfies:
predSamples[ x][y ]=(pred V[x][y ]+pred H[x][y]+nTbW*nTbH )>>(Log 2( nTbW )+Log 2( nTbH )+1).

3. The method of claim 1 , wherein a bottom reference sample row of the current block is padded by p[−1][nTbH].

4. The method of claim 1 , wherein the height of the current block is obtained without applying clipping operation nH=Max(nTbH, 2).

5. The method of claim 1 , wherein a right reference sample column of the current block is padded by p[nTbW][−1].

6. The method of claim 1 , wherein the width of the current block is obtained without applying clipping operation nW=Max(nTbW, 2).

7. A device of intra Planar prediction in a picture, comprising:
one or more processors; and
a non-transitory computer-readable storage medium coupled to the processors and storing programming for execution by the processors, wherein the programming, when executed by the processors, configures the device to:
obtain a height and a width of a current block;
calculate a value of a vertical component of an intra prediction sample based on the height and the width;
calculate a value of a horizontal component of the intra prediction sample based on the width and the height;
when the width of the current block is equal to 1, the value of the vertical component and the value of the horizontal component satisfy:
pred V[x][y ]=(( nTbH− 1− y )* p[x][− 1]+( y+ 1)* p[− 1 ][nTbH ])

pred H[x][y ]=(( x+ 1)* p[nTbW ][−1])<<Log 2( nTbH ),

wherein predV[x][y] represents the vertical component, predH[x][y] represents the horizontal component, nTbH represents the height of the current block, nTbW represents the width of the current block, p[x][y] represents neighbouring samples with x=−1, y=−1 . . . nTbH and x=0 . . . nTbW, y=−1; and
generate the intra prediction sample based on the value of the vertical component and the value of the horizontal component.

8. The device of claim 7 , wherein the intra prediction sample predSamples[x][y] satisfies:
predSamples[ x][y ]=(pred V[x][y ]+pred H[x][y]+nTbW*nTbH )>>(Log 2( nTbW )+Log 2( nTbH )+1).

9. The device of claim 7 , wherein the programming, when executed by the processors, configures the device to:
pad a right reference sample column of the current block by p[nTbW][−1].

10. The device of claim 7 , wherein the programming, when executed by the processors, configures the device to:
pad a bottom reference sample row of the current block by p[−1][nTbH].

11. The device of claim 7 , wherein the height of the current block is obtained without applying clipping operation nH=Max(nTbH, 2).

12. The device of claim 7 , wherein the width of the current block is obtained without applying clipping operation nW=Max(nTbW, 2).

13. The device of claim 7 , wherein the device is a decoder or an encoder.

14. A non-transitory computer-readable recording medium storing a bitstream that is generated by operations of intra Planar prediction implemented by a device, the operations comprising:
obtaining a height and a width of a current block;
calculating a value of a vertical component of an intra prediction sample based on the height and the width
calculating a value of a horizontal component of the intra prediction sample based on the width and the height without applying clipping operation to the height;
when the width of the current block is equal to 1, the value of the vertical component and the value of the horizontal component satisfy:
pred V[x][y ]=(( nTbH− 1− y )* p[x][− 1]+( y+ 1)* p[− 1 ][nTbH ])

pred H[x][y ]=(( x+ 1)* p[nTbW ][−1])<<Log 2( nTbH )

wherein predV[x][y] represents the vertical component, predH[x][y] represents the horizontal component, nTbH represents the height of the current block, nTbW represents the width of the current block, p[x][y] represents neighbouring samples with X=−1, y=−1 . . . nTbH and x=0 . . . nTbW, y=−1; and
generating the intra prediction sample based on the value of the vertical component and the value of the horizontal component.

15. The computer-readable recording medium of claim 14 , wherein the intra prediction sample predSamples[x][y] satisfies:
predSamples[ x][y ]=(pred V[x][y ]+pred H[x][y]+nTbW*nTbH )>>(Log 2( nTbW )+Log 2( nTbH )+1).

16. The computer-readable recording medium of claim 14 , wherein a bottom reference sample row of the current block is padded by p[−1][nTbH].

17. The computer-readable recording medium of claim 14 , wherein a right reference sample column of the current block is padded by p[nTbW][−1].

18. The computer-readable recording medium of claim 14 , wherein the height of the current block is obtained without applying clipping operation nH=Max(nTbH, 2).

19. The computer-readable recording medium of claim 14 , wherein the width of the current block is obtained without applying clipping operation nW=Max(nTbW, 2).

Assignees

• Huawei Tech Co Ltd

Inventors

• Wang Biao
• Esenlik Semih
• Kotra Anand Meher
• Gao Han
• Alshina Elena Alexandrovna

Classifications

• H04N19/176

  the region being a block, e.g. a macroblock · CPC title

• H04N19/172

  the region being a picture, frame or field · CPC title

• H04N19/132

  Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking · CPC title

• 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 · CPC title

• H04N19/122

  Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type · CPC title