Layered deblocking filtering in video processing systems and methods

Patent metadata

Field	Value
Publication number	US-2018295362-A1
Application number	US-201515765151-A
Country	US
Kind code	A1
Filing date	Sep 30, 2015
Priority date	Sep 30, 2015
Publication date	Oct 11, 2018
Grant date	—

Abstract

A protocol is provided by which a current block and a neighboring block are identified and the current block is processed. In some variants a deblocking filter is applied with a filtering block size set either to the standard blocksize or to the shared blocksize, depending on whether the shared size of the current and neighboring blocks is smaller than a standard blocksize.

First claim

1 . A computer-implemented method for processing digital video data comprising:
identifying a current block and a neighboring block, the current and neighboring blocks having a shared size and a linear boundary therebetween, the current and neighboring blocks both being adjacent the linear boundary; determining that the shared size of the current and neighboring blocks is smaller than a standard block size; and applying at least to the current block a deblocking filter with a filtering block size set to the standard block size.

2 . The computer-implemented method for processing digital video data of claim 1 further comprising:
configuring a video decoder of a device that does not have a video encoder to perform the identifying and the determining and the applying.

3 . The computer-implemented method for processing digital video data of claim 1 further comprising:
configuring a decoder loop of a video encoder to perform the identifying and the determining and the applying.

4 . The computer-implemented method for processing digital video data of claim 3 wherein the applying to the current block the deblocking filter with the filtering block size set to the standard block size comprises:
applying to the current block the deblocking filter with the filtering block size set to the standard block size as an automatic and conditional response to a determination that the shared size of the current and neighboring blocks is smaller than a standard block size and also applying to the current block a deblocking filter with a filtering block size set to the shared size of the current and neighboring blocks as an automatic and conditional response to a determination that the shared size of the current and neighboring blocks is at least equal to a standard block size.

5 . The computer-implemented method for processing digital video data of claim 1 further comprising:
applying to the current block a deblocking filter with a filtering block size set to the shared size of the current and neighboring blocks as an automatic and conditional response to a determination that the shared size of the current and neighboring blocks is at least equal to a standard block size.

6 . The computer-implemented method for processing digital video data of claim 5 wherein the identifying the current block and the neighboring block further comprises:
selecting a first block and a second block separated by a horizontal boundary respectively as the neighboring block and the current block, the horizontal boundary being the linear boundary.

7 . The computer-implemented method for processing digital video data of claim 6 wherein the identifying the current block and the neighboring block further comprises:
selecting a square block size as the standard block size.

8 . The computer-implemented method for processing digital video data of claim 1 wherein the identifying the current block and the neighboring block further comprises:
selecting a block size of at least 8 pixels by 8 pixels as the standard block size.

9 . The computer-implemented method for processing digital video data of claim 1 further comprising:
configuring a gaming device to perform the identifying and the determining and the applying.

10 . The computer-implemented method for processing digital video data of claim 1 further comprising:
configuring a handheld networked computing device to perform the identifying and the determining and the applying.

11 . The computer-implemented method for processing digital video data of claim 1 further comprising:
configuring a wearable networked computing device to perform the identifying and the determining and the applying.

12 . The computer-implemented method for processing digital video data of claim 1 wherein the identifying the current block and the neighboring block further comprises:
identifying as the shared size a block size selected from the group consisting of 4 pixels by 4 pixels, 8 pixels by 8 pixels, and 16 pixels by 16 pixels.

13 . The computer-implemented method for processing digital video data of claim 1 further comprising:
configuring a general purpose processor to perform the identifying and the determining and the applying.

14 . The computer-implemented method for processing digital video data of claim 1 wherein the current and neighboring blocks are consecutive transform blocks.

15 . The computer-implemented method for processing digital video data of claim 1 further comprising:
configuring the deblocking filter with a first boundary strength if an image block that includes the current and neighboring blocks is intra-coded and configuring the deblocking filter with a second boundary strength lower than the first boundary strength if the image block is not intra-coded.

16 . The computer-implemented method for processing digital video data of claim 1 further comprising:
configuring the deblocking filter with a first boundary strength if an image block that includes the current and neighboring blocks is intra-coded and configuring the deblocking filter with a second boundary strength lower than the first boundary strength if the image block is not intra-coded, the second boundary strength having a lower strength value if a quantized transform coefficient associated with the filtering block size is zero and the second boundary strength having a higher strength value if the quantized transform coefficient associated with the filtering block size is not zero.

17 . The computer-implemented method for processing digital video data of claim 1 wherein a general-purpose processor performs the identifying and the determining and the applying with the deblocking filter implemented only in software.

18 . A method for processing video data, the method comprising:
identifying a current block and a neighboring block, the current and neighboring blocks having a shared size and a linear boundary therebetween, the current and neighboring blocks both being adjacent the linear boundary; determining that the shared size of the current and neighboring blocks is at least equal to a standard block size; and applying at least to the current block a deblocking filter with a filtering block size set to the shared size of the current and neighboring blocks.

Assignees

• Tsai Chia Yang
• Realnetworks Inc

Inventors

• Tsai Chia-Yang
• Wang Kai
• Kuang Chao

Classifications

• H04N19/176

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

• H04N19/117 Primary

  Filters, e.g. for pre-processing or post-processing (sub-band filter banks H04N19/635) · CPC title

• H04N19/619

  the transform being operated outside the prediction loop · CPC title

• H04N19/86 Primary

  involving reduction of coding artifacts, e.g. of blockiness · CPC title

• H04N19/60

  using transform coding · CPC title