公开(公告)号：US11632540B2

公开(公告)日：2023-04-18

申请号：US17119758

申请日：2020-12-11

Applicant: QUALCOMM Incorporated

Inventor： Yao-Jen Chang ,  Vadim Seregin ,  Muhammed Zeyd Coban

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/30 ,  H04N19/70 ,  H04N19/176

Abstract: A video encoder and video decoder may be configured to disable subpicture processing in situations where reference picture scaling is enabled. In another example, when reference picture scaling is enabled, a video encoder may determine a reference picture scaling ratio for the reference picture resampling process based on a width of a scaling window (PicOutputWidthL) of the current picture and a height of the scaling window (PicOutputHeightL) of the current picture. The values of PicOutputWidthL and PicOutputHeightL are constrained, respectively, relative to a width of a scaling window (refPicOutputWidthL) of the reference picture and a height of the scaling window (refPicOutputHeightL) of the reference picture.

公开(公告)号：US20220210423A1

公开(公告)日：2022-06-30

申请号：US17456080

申请日：2021-11-22

Applicant: QUALCOMM Incorporated

Inventor： Yao-Jen Chang ,  Marta Karczewicz

IPC: H04N19/13 ,  H04N19/105 ,  H04N19/159 ,  H04N19/70 ,  H04N19/176

Abstract: A video coder may code a block of video data using an intra prediction mode determined from a most probable mode list. The video coder may construct a general most probable mode list containing N entries, wherein the N entries of the general most probable mode list are intra prediction modes, and wherein a planar mode is an ordinal first entry in the general most probable mode list, construct a primary most probable mode list from a first Np entries in the general most probable mode list, where Np is less than N, and construct a secondary most probable mode list from a remaining (N-Np) entries in the general most probable mode list. The video coder may then determine a current intra prediction mode for a current block of video data using the primary most probable mode list or the secondary most probable mode list.

公开(公告)号：US11356685B2

公开(公告)日：2022-06-07

申请号：US17027262

申请日：2020-09-21

Applicant: QUALCOMM Incorporated

Inventor： Yao-Jen Chang ,  Muhammed Zeyd Coban ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/44 ,  H04N19/70 ,  H04N19/132 ,  H04N19/423 ,  H04N19/186 ,  H04N19/176

Abstract: A video decoder can be configured to decode a first syntax element indicating a size of a coding tree unit (CTU); after decoding the first syntax element indicating the size of the CTU, decode a second syntax element indicating a width of elements of a subpicture identifier grid; after decoding the first syntax element indicating the size of the CTU, decode a third syntax element indicating a height of the elements of the subpicture identifier grid; and determine a location of a subpicture within a picture based on the first syntax element, the second syntax element, and the third syntax element.

公开(公告)号：US11350083B2

公开(公告)日：2022-05-31

申请号：US16847918

申请日：2020-04-14

Applicant: QUALCOMM Incorporated

Inventor： Yao-Jen Chang ,  Chun-Chi Chen ,  Wei-Jung Chien ,  Marta Karczewicz

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46 ,  H04N19/70

Abstract: A method of encoding and decoding video data, including coding a first syntax element that specifies a value used to derive a maximum number of intra block copy merging candidates, deriving the maximum number of intra block copy merging candidates based on the value of the first sytnax element, and coding a first block of video data using intra block copy mode according to the maximum number of intra block copy merging candidates.

公开(公告)号：US20210314624A1

公开(公告)日：2021-10-07

申请号：US17220418

申请日：2021-04-01

Applicant: QUALCOMM Incorporated

Inventor： Muhammed Zeyd Coban ,  Vadim Seregin ,  Yong He ,  Yao-Jen Chang

IPC: H04N19/70 ,  H04N19/105 ,  H04N19/169

Abstract: An example method includes decoding, from a picture header syntax structure of a coded video bitstream, a syntax element indicating whether or not a picture associated with the picture header syntax structure may include multiple different types of Network Abstraction Layer (NAL) units; responsive to the syntax element indicating that the picture may include multiple different types of NAL units, decoding a merged subpicture track that includes the picture where each picture in the merged subpicture track refers to a common picture parameter set (PPS); and reconstructing, based on the common PPS, samples of the picture.

公开(公告)号：US11109070B2

公开(公告)日：2021-08-31

申请号：US16948084

申请日：2020-09-02

Applicant: QUALCOMM Incorporated

Inventor： Yao-Jen Chang ,  Vadim Seregin ,  Muhammed Zeyd Coban ,  Adarsh Krishnan Ramasubramonian ,  Marta Karczewicz

IPC: H04N19/70 ,  H04N19/119 ,  H04N19/157 ,  H04N19/174 ,  H04N19/103

Abstract: An example device includes a memory configured to store video data and one or more processors implemented in circuitry and communicatively coupled to the memory. The one or more processors are configured to determine whether a maximum number of merge candidates for a slice of the video data is equal to a first value. The one or more processors are configured to infer a value of a first syntax element to be equal to a second value based at least in part on the maximum number of merge candidates for the slice being equal to the first value, the first syntax element being indicative of a maximum number of merge candidates and a maximum number of merge candidates of a non-rectangular coding mode. The one or more processors are also configured to decode the slice based on the maximum number of merge candidates and the first syntax element.

公开(公告)号：US20210195172A1

公开(公告)日：2021-06-24

申请号：US17119758

申请日：2020-12-11

Applicant: QUALCOMM Incorporated

Inventor： Yao-Jen Chang ,  Vadim Seregin ,  Muhammed Zeyd Coban

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/30 ,  H04N19/70 ,  H04N19/176

Abstract: A video encoder and video decoder may be configured to disable subpicture processing in situations where reference picture scaling is enabled. In another example, when reference picture scaling is enabled, a video encoder may determine a reference picture scaling ratio for the reference picture resampling process based on a width of a scaling window (PicOutputWidthL) of the current picture and a height of the scaling window (PicOutputHeightL) of the current picture. The values of PicOutputWidthL and PicOutputHeightL are constrained, respectively, relative to a width of a scaling window (refPicOutputWidthL) of the reference picture and a height of the scaling window (refPicOutputHeightL) of the reference picture.

公开(公告)号：US20210092421A1

公开(公告)日：2021-03-25

申请号：US17027262

申请日：2020-09-21

Applicant: QUALCOMM Incorporated

Inventor： Yao-Jen Chang ,  Muhammed Zeyd Coban ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/44 ,  H04N19/70 ,  H04N19/132 ,  H04N19/423 ,  H04N19/186 ,  H04N19/176

Abstract: A video decoder can be configured to decode a first syntax element indicating a size of a coding tree unit (CTU); after decoding the first syntax element indicating the size of the CTU, decode a second syntax element indicating a width of elements of a subpicture identifier grid; after decoding the first syntax element indicating the size of the CTU, decode a third syntax element indicating a height of the elements of the subpicture identifier grid; and determine a location of a subpicture within a picture based on the first syntax element, the second syntax element, and the third syntax element.

公开(公告)号：US20200267406A1

公开(公告)日：2020-08-20

申请号：US16793807

申请日：2020-02-18

Applicant: QUALCOMM Incorporated

Inventor： Yao-Jen Chang ,  Wei-Jung Chien ,  Marta Karczewicz

IPC: H04N19/513 ,  H04N19/70

Abstract: A video decoder configured to generate a first merge candidate list for a first block; determine that the first block is coded in a merge mode with motion vector differences; in response to determining that a maximum number of entries for the first merge candidate list is equal to 1, infer a value of a first instance of a flag to be equal to a first value, wherein the first value for the flag indicates that the first block is to be decoded using a first entry in the first merge candidate list; receive first motion vector difference information; determine first motion information for predicting the first block based on candidate motion information included in the first entry of the first merge candidate list and the first motion vector difference information; and decode the first block using the first motion information.

公开(公告)号：US20250119528A1

公开(公告)日：2025-04-10

申请号：US18904743

申请日：2024-10-02

Applicant: QUALCOMM Incorporated

Inventor： Po-Han Lin ,  Jian-Liang Lin ,  Yao-Jen Chang ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/105 ,  H04N19/11 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/593 ,  H04N19/70

Abstract: A device for decoding encoded video data is configured to determine that a chroma block of the encoded video data is coded in a cross-component prediction (CCP) mode; generate a merge candidate list for the chroma block, wherein the merge candidate list includes at least two prediction candidates generated by different CCP modes and a third prediction candidate, wherein the third prediction candidate comprises a fusion prediction candidate; receive, in the encoded video data, a syntax element set to a value; select a prediction candidate from the merge candidate list based on the value of the syntax element; determine a prediction block for the chroma block based on the selected prediction candidate; determine a decoded block of video data based on the prediction block for the chroma block; and output a decoded picture of video data that includes the decoded block of video data.