公开(公告)号：US20240414333A1

公开(公告)日：2024-12-12

申请号：US18734814

申请日：2024-06-05

Applicant: QUALCOMM Incorporated

Inventor： Ikram Jumakulyyev ,  Nan Hu ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/117 ,  H04N19/124 ,  H04N19/159 ,  H04N19/174 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70 ,  H04N19/82 ,  H04N19/86

Abstract: A device for decoding video data, as part of applying a first stage of an adaptive loop filter (ALF) to a reconstructed sample of a reconstructed block for a color component, selects a first set of filters from a plurality of sets of fixed filters based on a quantization parameter of the block of video data and a second characteristic of the block of video data; determines a first class index for the reconstructed sample; selects a filter from a first set of filters based on the first class index; and applies the filter from the first set of filters to the reconstructed sample to determine a first intermediate sample value.

公开(公告)号：US20240223816A1

公开(公告)日：2024-07-04

申请号：US18532874

申请日：2023-12-07

Applicant: QUALCOMM Incorporated

Inventor： Ikram Jumakulyyev ,  Nan Hu ,  Vadim Seregin ,  Marta Karczewicz ,  Zhi Zhang ,  Han Huang

IPC: H04N19/82 ,  H04N19/117 ,  H04N19/176

CPC classification number: H04N19/82 ,  H04N19/117 ,  H04N19/176

Abstract: Example methods and devices are disclosed relating to the use of adaptive loop filter classifiers. An example method includes determining a sum of absolute values of one or more reconstructed residual sample values within a window associated with a block of the video data. The example method includes determining a class index based at least in part on the sum of absolute values. The example method includes determining an adaptive loop filter based on the class index. The example method includes applying the adaptive loop filter to a current to-be-filtered sample of the block. The example method includes decoding the block based on the application of the adaptive loop filter.

公开(公告)号：US20240223758A1

公开(公告)日：2024-07-04

申请号：US18543641

申请日：2023-12-18

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Vadim Seregin ,  Nan Hu ,  Ikram Jumakulyyev

IPC: H04N19/117 ,  H04N19/119 ,  H04N19/124 ,  H04N19/132 ,  H04N19/136 ,  H04N19/176

CPC classification number: H04N19/117 ,  H04N19/119 ,  H04N19/124 ,  H04N19/132 ,  H04N19/136 ,  H04N19/176

Abstract: A method and apparatus for coding video data includes filtering video data using a loop filter, such as an adaptive loop filter (ALF), that is determined using a classifier from a plurality of classifiers. A video coder may reconstruct a block of video data to generate a reconstructed block, determine a filter class for the reconstructed block using a classifier from a plurality of classifiers, wherein the plurality of classifiers includes one or more of a first classifier based on a geometry partition and a second classifier based on a histogram of gradients, determine a filter based on the filter class, and apply the filter to the reconstructed block.