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公开(公告)号：US20250030835A1
公开(公告)日：2025-01-23
申请号：US18770700
申请日：2024-07-12
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
IPC: H04N19/105 , H04N19/117 , H04N19/136 , H04N19/186 , H04N19/196
Abstract: The present disclosure relates to the field of picture processing. In particular, the present disclosure relates to improving intra prediction (such as the chroma intra prediction) using a cross component linear model (CCLM) and, more particularly, relating to spatial filtering used in a cross-component linear model for intra prediction with different chroma formats. An apparatus, an encoder, a decoder and corresponding methods for cross-component prediction for a picture, in which the set of down-sampling filters applied during the prediction depends on a chroma format, that may be one of multiple supported chroma formats are provided, so as to improve coding efficiency.
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公开(公告)号：US20240187634A1
公开(公告)日：2024-06-06
申请号：US18427975
申请日：2024-01-31
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Vasily Alexeevich RUFITSKIY , Timofey Mikhailovich Solovyev , Alexey Konstantinovich FILIPPOV , Jianle Chen
IPC: H04N19/513 , H04N19/159 , H04N19/176 , H04N19/186 , H04N19/30
CPC classification number: H04N19/513 , H04N19/159 , H04N19/176 , H04N19/186 , H04N19/30
Abstract: The present invention relates to method and apparatus for motion vector derivation for affine based inter prediction of chroma subblocks based on chroma format. The method includes: determining chroma scaling factors in horizontal and vertical directions based on chroma format information, wherein the chroma format information indicates a chroma format of a current picture which the current image block belongs to; determining a set (S) of luma subblocks of the luma block based on values of the chroma scaling factors; determining a motion vector for a chroma subblock of the chroma block based on motion vectors of one or more luma subblocks in the set (S) of luma subblocks.
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公开(公告)号：US20240015304A1
公开(公告)日：2024-01-11
申请号：US18171458
申请日：2023-02-20
Applicant: Huawei Technologies Co., Ltd.
IPC: H04N19/159 , H04N19/105 , H04N19/132 , H04N19/176
CPC classification number: H04N19/159 , H04N19/105 , H04N19/132 , H04N19/176
Abstract: Apparatuses and methods for intra predicting a block are described. The method of intra predicting a current block can include obtaining a predicted sample value from one or more reference sample values by using an intra prediction mode, obtaining at least one additional reference sample value in accordance with the intra prediction mode, and obtaining a thresholded additional reference sample value based on the additional reference sample value. The method can also include calculating an additional value from the thresholded additional reference sample value, multiplying the predicted sample value by a sample weighting factor, resulting in a weighted predicted sample value, adding the additional value to the weighted predicted sample value, resulting in a non-normalized predicted sample value, and normalizing the non-normalized predicted sample value, resulting in a normalized predicted sample values. The accuracy for the intra prediction is thus increased.
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公开(公告)号：US20230071458A1
公开(公告)日：2023-03-09
申请号：US17899358
申请日：2022-08-30
Applicant: Huawei Technologies Co., Ltd.
IPC: H04N19/593 , H04N19/176 , H04N19/70 , H04N19/46 , H04N19/136 , H04N19/11
Abstract: An encoding apparatus is described for signaling an extension directional intra-prediction mode within a set of directional intra-prediction modes, the set of directional intra-prediction modes comprising predetermined directional intra-prediction modes and the extension directional intra-prediction mode. The encoding apparatus comprises a mode mapping unit selecting a predetermined directional intra-prediction mode, the selected predetermined directional intra-prediction mode being associated with an intra mode index, and mapping the extension directional intra-prediction mode onto the selected predetermined directional intra-prediction mode. A signaling unit generates a signaling indicator comprising at least one of the intra mode index and a flag value. An intra-prediction unit intra-predicts pixel values of pixels of a rectangular video coding block on the basis of the extension directional intra-prediction mode for providing a predicted rectangular video coding block. An encoding unit encodes the rectangular video coding block on the basis of the predicted rectangular video coding block.
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公开(公告)号：US20230047926A1
公开(公告)日：2023-02-16
申请号：US17876758
申请日：2022-07-29
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
IPC: H04N19/159 , H04N19/105 , H04N19/117 , H04N19/119 , H04N19/132 , H04N19/176 , H04N19/46 , H04N19/82
Abstract: Devices and methods of intra prediction of a block of a picture are provided. In various embodiments, information indicating an Intra Sub-Partitions (ISP) split type can be obtained. A value of a filter flag can be set based on the ISP split type. For instance, the value of the filter flag can be set to 0 when the ISP split type does not indicate not to split a current block. A set of coefficients of an interpolation filter can then be selected according to the value of the filter flag. For instance, fG coefficients or fC coefficients can be selected based on the value of the filter flag. Still in those embodiment, the selected set of coefficients can be applied to reference samples. In some embodiments, the method removes mode dependency during selection of interpolation filter type. This could increase encoding or decoding efficiency.
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Patent Agency Ranking
公开(公告)号：US20220400260A1
公开(公告)日：2022-12-15
申请号：US17861641
申请日：2022-07-11
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Alexey Konstantinovich FILIPPOV , Huanbang CHEN , Vasily Alexeevich RUFITSKIY , Haitao YANG , Elena Alexandrovna ALSHINA
IPC: H04N19/119 , H04N19/174 , H04N19/172 , H04N19/176 , H04N19/70 , H04N19/503
Abstract: A method of coding is described. The method can include obtaining a bitstream for a current picture, obtaining a value of a first indicator for the current picture according to the bitstream indicating a slice type, and obtaining a value of a second indicator for the current picture according to the bitstream indicating whether a weighted prediction parameter is present in a picture header or slice header of the bitstream. The method can also include parsing a value of the weighted prediction parameter for a current block of a current slice of the current picture from the bitstream. Furthermore, the method can include predicting the current block according to the value of the weighted prediction parameter.
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7.发明申请公开(公告)号：US20220385900A1
公开(公告)日：2022-12-01
申请号：US17877492
申请日：2022-07-29
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
IPC: H04N19/117 , H04N19/176
Abstract: A method of video coding, wherein the method comprises inter-prediction processing of a first block, wherein the inter-prediction processing comprises subpixel interpolation filtering of samples of a reference block; intra-prediction processing of a second block, wherein the intra-prediction processing comprises subpixel interpolation filtering of reference samples; wherein the method further comprises selecting interpolation filter coefficients for the subpixel interpolation filtering based on a subpixel offset between integer reference sample positions and fractional reference samples' positions, wherein for the same subpixel offsets the same interpolation filter coefficients are selected for intra-prediction processing and inter-prediction processing.
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公开(公告)号：US20220368930A1
公开(公告)日：2022-11-17
申请号：US17863242
申请日：2022-07-12
Applicant: Huawei Technologies Co., Ltd.
Inventor： Alexey Konstantinovich FILIPPOV , Vasily Alexeevich RUFITSKIY , Elena Alexandrovna ALSHINA
IPC: H04N19/44 , H04N19/176 , H04N19/46 , H04N19/70
Abstract: A method of obtaining a maximum number of geometric partitioning merge mode candidates for video decoding and a video decoding apparatus are disclosed, wherein the method comprises: obtaining a bitstream for a video sequence; obtaining a value of a first indicator according to the bitstream, wherein the first indicator represents a maximum number of merging motion vector prediction (MVP) candidates; obtaining a value of a second indicator according to the bitstream, wherein the second indicator represents whether a geometric partition based motion compensation is enabled for the video sequence; and parsing a value of a third indicator from the bitstream, when the value of the first indicator is greater than a threshold and when the value of the second indicator is equal to a preset value, wherein the third indicator represents a maximum number of geometric partitioning merge mode candidates subtracted from the value of the first indicator.
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9.发明申请公开(公告)号：US20220279208A1
公开(公告)日：2022-09-01
申请号：US17750099
申请日：2022-05-20
Applicant: Huawei Technologies Co., Ltd.
IPC: H04N19/593 , H04N19/176 , H04N19/182 , H04N19/70 , H04N19/157 , H04N19/11
Abstract: An intra-prediction apparatus and method are provided for extending a set of predetermined directional intra-prediction modes of a rectangular video coding block. The intra-prediction apparatus determines an aspect ratio of the rectangular video coding block, and determines a complementary angle range based on the aspect ratio. The apparatus then selects a complementary direction within the complementary directional range, and adds an extension directional intra-prediction mode associated with the complementary direction to the set of predetermined directional intra-prediction modes. Based on the extension directional intra-prediction mode, the apparatus intra-predicts pixel values of pixels of the rectangular video coding block.
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公开(公告)号：US20220124368A1
公开(公告)日：2022-04-21
申请号：US17352012
申请日：2021-06-18
Applicant: Huawei Technologies Co., Ltd.
IPC: H04N19/593 , H04N19/176 , H04N19/132 , H04N19/105 , H04N19/11
Abstract: A method of intra predicting a block of a picture, comprising determining a predicted sample value from one or more reference sample values by intra-prediction using an intra prediction mode selected from one of a DC intra-prediction mode, a planar intra prediction mode, and an angular intra-prediction mode; determining a first and second weights based on the intra prediction mode and one of the height of the block, the width of the block, or both; calculating an additional value as a weighted sum of a top reference sample value and a left reference sample value; multiplying the predicted sample value by a sample weighting factor, resulting in a weighted predicted sample value; adding the additional value to the weighted predicted sample value, resulting in a non-normalized modified predicted sample value; and normalizing the non-normalized modified predicted sample value.
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