公开(公告)号：US20200099924A1

公开(公告)日：2020-03-26

申请号：US16576677

申请日：2019-09-19

Applicant: QUALCOMM Incorporated

Inventor： Vadim SEREGIN ,  Akshay GADDE ,  Hilmi Enes EGILMEZ ,  Marta KARCZEWICZ ,  Amir SAID

IPC: H04N19/103 ,  H04N19/61 ,  H04N19/156 ,  H04N19/115 ,  H04N19/176

Abstract: Techniques are described for improving transform coding. For example, an encoded block of video data can be obtained, and a width and/or a height of the block can be determined. The width can be compared to a first threshold and/or the height can be compared to a second threshold. A horizontal transform and a vertical transform can be determined for the block based on comparing the width of the block to the first threshold and/or the height of the block to the second threshold. The horizontal transform and the vertical transform are determined without decoding a syntax element that indicates the horizontal transform and the vertical transform (e.g., the syntax element is not in an encoded video bitstream processed by a decoding device). In some cases, residual data is determined using the horizontal and vertical transforms, and a video block is determined using the residual data and a predictive block.

公开(公告)号：US20190306502A1

公开(公告)日：2019-10-03

申请号：US16371764

申请日：2019-04-01

Applicant: QUALCOMM Incorporated

Inventor： Akshay GADDE ,  Li Zhang ,  Marta Karczewicz ,  Wei-Jung Chein

IPC: H04N19/117 ,  H04N19/136 ,  H04N19/82 ,  H04N19/132 ,  H04N19/124 ,  H04N19/70

Abstract: Methods and systems for improved adaptive loop filters (ALFs) used in post-processing stage of in-loop coding or the prediction stage of video coding. To account for various shortcomings, techniques to improve coding gains and visual quality of ALFs are discussed. First, refinement of ALF coefficients for each block is allowed wherein different units (used for class calculation, e.g., 2×2 sub-blocks in GALF) located in different blocks with the same class index may have different filters. Second, ALF filters can be modified or weakened to without signaling ALF filter coefficients.

公开(公告)号：US20190230353A1

公开(公告)日：2019-07-25

申请号：US16250794

申请日：2019-01-17

Applicant: QUALCOMM Incorporated

Inventor： Akshay GADDE ,  Li Zhang ,  Wei-Jung Chien ,  Marta Karczewicz

IPC: H04N19/117 ,  H04N19/176 ,  H04N19/14 ,  H04N19/196 ,  H04N19/86 ,  H04N19/61

Abstract: Codecs that use larger blocks may have larger boundary regions that may benefit from filtering. In some embodiments, the deblocking filter determines filters and/or a number of samples of the block to be filtered based on block dimensions. For example, In one embodiment, deblocking filter parameters for the video block are determined based on at least one dimension of the size of the video block. The filter parameters include a filter to be applied or a number of pixels along a boundary with a neighboring block to which the filter is to be applied determined based on the at least one dimension.