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公开(公告)号：US12101484B2
公开(公告)日：2024-09-24
申请号：US18143156
申请日：2023-05-04
发明人： Kenneth Andersson , Jacob Ström , Zhi Zhang , Jack Enhorn
IPC分类号： H04N19/105 , H04N19/117 , H04N19/132 , H04N19/176 , H04N19/82
CPC分类号： H04N19/132 , H04N19/105 , H04N19/117 , H04N19/176 , H04N19/82
摘要： A method for encoding or decoding an image. The method includes obtaining a coding tree block (CTB) having a vertical size (CtbSizeY) and a horizontal size (CtbSizex), the CTB comprising set of sample values associated with the image, the set of sample values comprising a current sample value having a location (x,y) within the CTB, where x is a horizontal value and y is a vertical value. The method also includes selecting a filter strength value for the current sample based on y and filtering the current sample using the selected filter strength value. Selecting a filter strength value for the current sample based on y comprises: i) determining whether the following first condition is true: (y==(CtbSizeY−5) OR y==(CtbSizeY−4)) AND var==1, where var is a variable that is set equal to 1 as a result of a determination that a second condition is satisfied; and ii) choosing a filter strength value of 10 as a result of determining that the first condition is true.
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公开(公告)号：US12058323B2
公开(公告)日：2024-08-06
申请号：US17972036
申请日：2022-10-24
发明人： Kenneth Andersson , Rickard Sjöberg , Jacob Ström , Zhi Zhang
IPC分类号： H04N19/86 , H04N19/117 , H04N19/119 , H04N19/18 , H04N19/635
CPC分类号： H04N19/117 , H04N19/119 , H04N19/18 , H04N19/635 , H04N19/86
摘要： In one aspect there is disclosed a method of applying deblocking on implicit vertical TU boundaries when the CU width is larger than the maximum TU width and applying deblocking on implicit horizontal TU boundaries when the CU height is larger than the maximum TU height. Some exemplary embodiments include HEVC deblocking and deblocking using longer filters.
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公开(公告)号：US20220256163A1
公开(公告)日：2022-08-11
申请号：US17724883
申请日：2022-04-20
发明人： Kenneth ANDERSSON , Jacob Ström , Zhi Zhang , Jack Enhorn
IPC分类号： H04N19/132 , H04N19/105 , H04N19/117 , H04N19/176 , H04N19/82
摘要： A method for encoding or decoding an image of a video sequence is provided. The method comprises obtaining a set of sample values associated with the image. The method comprises determining a relative location of the current sample value with respect to a virtual boundary. The virtual boundary is defined with respect to a block boundary between the first block of sample values and a second block of sample values. The virtual boundary is parallel with the block boundary and separated from the block boundary by at least one row or column of sample values included in the first block of sample values. The method comprises a filter strength value based on the determined relative location of the current sample value with respect to the virtual boundary. The method comprises filtering the current sample value based on the selected filter strength value.
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公开(公告)号：US11317095B2
公开(公告)日：2022-04-26
申请号：US17323502
申请日：2021-05-18
发明人： Kenneth Andersson , Jacob Ström , Zhi Zhang , Jack Enhorn
IPC分类号： H04N19/105 , H04N19/117 , H04N19/176 , H04N19/132 , H04N19/82
摘要： A method for encoding or decoding an image of a video sequence is provided. The method comprises obtaining a set of sample values associated with the image. The method comprises determining a relative location of the current sample value with respect to a virtual boundary. The virtual boundary is defined with respect to a block boundary between the first block of sample values and a second block of sample values. The virtual boundary is parallel with the block boundary and separated from the block boundary by at least one row or column of sample values included in the first block of sample values. The method comprises a filter strength value based on the determined relative location of the current sample value with respect to the virtual boundary. The method comprises filtering the current sample value based on the selected filter strength value.
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公开(公告)号：US11064210B2
公开(公告)日：2021-07-13
申请号：US16339117
申请日：2017-07-17
IPC分类号： H04N19/186 , H04N19/117 , H04N9/68 , H04N9/77 , H04N19/182 , H04N19/86 , H04N19/85
摘要： A processing for a first pixel in a picture comprises obtaining a lower limit of a first color component of the first pixel in a first color space based on a distance between a color of the first pixel and a first distorted version of the color in a second color space. An upper limit of the first color component in the first color 5 space is obtained based on a distance between the color and a second distorted version of the color in the second color space. A filtered value is obtained of the first color component and which is equal to or larger than the lower limit and equal to or lower than the upper limit. The processing results in filtered values that are cheaper to encode but that are visibly undistinguishable from the original colors of the pixels.
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公开(公告)号：US10575001B2
公开(公告)日：2020-02-25
申请号：US15505509
申请日：2016-05-10
IPC分类号： H04N19/186 , G09G5/02 , H04N19/86 , H04N19/85 , H04N19/132 , H04N19/182 , H04N19/59
摘要： A pixel pre-processing comprises subsampling a linear color in a first color space to obtain a subsampled linear color in the first color space. A first transfer function is applied to the subsampled linear color in the first color space to obtain a subsampled non-linear color in the first color space. A first color transform is applied to the subsampled non-linear color in the first color space to obtain a subsampled first non-linear chroma component value and/or a subsampled second non-linear chroma component value in a second color space. A non-linear luma component value in the second color space is derived for the pixel, which together with the subsampled non-linear chroma component values represent a color the pixel. The pre-processing reduces chroma artifacts that may otherwise occur when chroma subsampling is performed following application of the first transfer function and the first color transform.
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公开(公告)号：US10397536B2
公开(公告)日：2019-08-27
申请号：US15473746
申请日：2017-03-30
发明人： Jacob Ström , Jonatan Samuelsson
IPC分类号： H04N9/67 , H04N19/86 , H04N19/186 , H04N19/182 , G06T3/00 , H04N9/64 , H04N19/59
摘要： A pixel pre-processing comprises obtaining an original linear luminance component value of a pixel in a picture in a third color space determined based on a linear color of the pixel in a first color space. A non-linear luma component value in a second color space is derived for the pixel based on a first non-linear chroma component value in the second color space, a second non-linear chroma component value in the second color space and the original linear luminance component value in the third color space. The pre-processing reduces luminance artifacts that otherwise may occur when chroma subsampling is used in combination with a non-linear transfer function.
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公开(公告)号：US10298984B2
公开(公告)日：2019-05-21
申请号：US15125838
申请日：2014-03-17
发明人： Johan Kölhi , Michael Huber , Jacob Ström
IPC分类号： H04N21/2662 , H04N21/2343 , H04N21/24 , H04L29/06 , H04N21/4147 , H04L29/08
摘要： There is provided a method for transmitting video content, the video content available for transmission in a plurality of quality levels. The method comprises identifying a user apparatus that has received a particular chunk of video content at a first quality level. The method further comprises transmitting to the identified user apparatus the filename for a chunk of video content corresponding to the particular chunk but at a second quality level.
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公开(公告)号：US09813839B2
公开(公告)日：2017-11-07
申请号：US15103013
申请日：2013-12-12
发明人： Jacob Ström , Pål Frenger , Hugo Tullberg
IPC分类号： H04W4/00 , H04L29/08 , H04W4/20 , H04L1/00 , H04L12/931 , H04W36/02 , H04W4/02 , H04W84/04 , H04W88/02
CPC分类号： H04W4/50 , H04L1/0018 , H04L49/355 , H04L67/2804 , H04L67/2842 , H04L67/2861 , H04L67/288 , H04L67/289 , H04L67/34 , H04W4/02 , H04W4/20 , H04W4/60 , H04W36/02 , H04W84/042 , H04W88/02
摘要： A method and intermediate network node provide a service requested by a mobile terminal in a wireless communications network. The intermediate network node has a processing unit and a memory containing instructions executable by the processing unit. The intermediate network node receives a first request for a service from the mobile terminal, and receives application software configured to be executed at the intermediate network node to provide the mobile terminal with at least part of the requested service. The intermediate network node provides the mobile terminal with the at least part of the requested service. A subsequent request related to the service of the mobile terminal terminates at the intermediate network node, and provides the mobile terminal with at least part of the service requested in the subsequent request on behalf of a provider of the service.
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公开(公告)号：US09794591B2
公开(公告)日：2017-10-17
申请号：US15415536
申请日：2017-01-25
发明人： Jacob Ström , Kenneth Andersson
IPC分类号： H04N19/00 , H04N19/60 , H04N19/13 , H04N19/139 , H04N19/176 , H04N19/547
CPC分类号： H04N19/60 , H03M7/4018 , H04N19/13 , H04N19/139 , H04N19/176 , H04N19/21 , H04N19/44 , H04N19/547 , H04N19/593 , H04N19/61 , H04N19/625 , H04N19/65 , H04N19/91
摘要： Video encoder and decoder and methods therein for transform skipped encoding and decoding of blocks of pixels. The methods comprise a modified use of an existing context model associated with transform coefficients, for deriving contexts for a bitmask indicating which residual values (i.e., not transform coefficients), in a transform skipped residual block, that are greater than one. The methods are applicable to video coding schemes such as HEVC.
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