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公开(公告)号：US20170366808A1
公开(公告)日：2017-12-21
申请号：US15618216
申请日：2017-06-09
Applicant: MEDIATEK INC.
Inventor： Hung-Chih LIN , Jian-Liang LIN , Chia-Ying LI , Chao-Chih HUANG , Shen-Kai CHANG
IPC: H04N19/117 , H04N19/70 , H04N19/463 , H04N19/196 , H04N19/172 , H04N19/82 , H04N19/167
CPC classification number: H04N19/117 , H04N5/2252 , H04N5/2258 , H04N5/23238 , H04N19/167 , H04N19/172 , H04N19/196 , H04N19/46 , H04N19/463 , H04N19/597 , H04N19/70 , H04N19/82
Abstract: Methods and apparatus of processing cube face images are disclosed. According to embodiments of the present invention, one or more discontinuous boundaries within each assembled cubic frame are determined and used for selective filtering, where the filtering process is skipped at said one or more discontinuous boundaries within each assembled cubic frame when the filtering process is enabled. Furthermore, the filtering process is applied to one or more continuous areas in each assembled cubic frame.
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2.发明申请公开(公告)号：US20180098090A1
公开(公告)日：2018-04-05
申请号：US15722734
申请日：2017-10-02
Applicant: MEDIATEK INC.
Inventor： Hung-Chih LIN , Jian-Liang LIN , Shen-Kai CHANG
IPC: H04N19/597 , H04N13/00 , H04N19/174 , H04N19/533 , H04N19/82 , H04N19/70
CPC classification number: H04N19/597 , H04N13/117 , H04N13/139 , H04N13/156 , H04N13/161 , H04N13/194 , H04N13/204 , H04N13/344 , H04N19/174 , H04N19/523 , H04N19/533 , H04N19/55 , H04N19/70 , H04N19/82
Abstract: Methods and apparatus for processing a 360°-VR frame sequence are disclosed. According to one method, input data associated with a 360°-VR frame sequence are received, where each 360°-VR frame comprises one set of faces associated with a polyhedron format. Each set of faces is rearranged into one rectangular whole VR frame consisting of a front sub-frame and a rear sub-frame, where the front sub-frame corresponds to first contents in a first field of view covering front 180°×180° view and the rear sub-frame corresponds to second contents in a second field of view covering rear 180°×180° view. Output data corresponding to a rearranged 360°-VR frame sequence consisting of a sequence of rectangular whole VR frames are provided.
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公开(公告)号：US20170214937A1
公开(公告)日：2017-07-27
申请号：US15399813
申请日：2017-01-06
Applicant: MEDIATEK INC.
Inventor： Hung-Chih LIN , Shen-Kai CHANG
IPC: H04N19/577 , H04N19/56 , H04N19/563
CPC classification number: H04N19/577 , H04N19/56 , H04N19/563 , H04N19/597
Abstract: Methods and apparatus of video encoding and decoding for a spherical image sequence and a cubic image sequence using circular Inter prediction are disclosed. For the spherical image sequence, the search window includes an area outside or crossing a vertical frame boundary of the reference frame for at least one block of the current spherical image to be encoded. Candidate reference blocks within the search window are determined, where if a given candidate reference block is outside or crossing one vertical frame boundary, the reference pixels are accessed circularly from the reference frame in a horizontal direction crossing the vertical frame boundary of the reference frame. For the cubic image sequence, circular edges of the cubic frame are determined. The search window includes an area outside or crossing a circular edge of the reference frame for at least one block of the current cubic frame to be encoded.
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公开(公告)号：US20190246105A1
公开(公告)日：2019-08-08
申请号：US16386356
申请日：2019-04-17
Applicant: MEDIATEK INC.
Inventor： Hung-Chih LIN , Jian-Liang LIN , Chia-Ying LI , Chao-Chih HUANG , Shen-Kai CHANG
IPC: H04N19/117 , H04N19/46 , H04N19/597 , H04N5/232 , H04N19/82 , H04N19/70 , H04N19/463 , H04N19/196 , H04N19/172 , H04N19/167 , H04N5/225
CPC classification number: H04N19/117 , H04N5/2252 , H04N5/2258 , H04N5/23238 , H04N19/167 , H04N19/172 , H04N19/196 , H04N19/46 , H04N19/463 , H04N19/597 , H04N19/70 , H04N19/82
Abstract: Methods and apparatus of processing cube face images are disclosed. According to embodiments of the present invention, one or more discontinuous boundaries within each assembled cubic frame are determined and used for selective filtering, where the filtering process is skipped at said one or more discontinuous boundaries within each assembled cubic frame when the filtering process is enabled. Furthermore, the filtering process is applied to one or more continuous areas in each assembled cubic frame.
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公开(公告)号：US20190068949A1
公开(公告)日：2019-02-28
申请号：US16105147
申请日：2018-08-20
Applicant: MEDIATEK INC.
Inventor： Peng WANG , Hung-Chih LIN , Jian-Liang LIN , Shen-Kai CHANG
IPC: H04N13/178 , H04N5/232 , H04N13/139 , H04N19/597
Abstract: According to one method, at a source side or an encoder side, a selected viewport associated with the 360-degree virtual reality images is determined. One or more parameters related to the selected pyramid projection format are then determined. According to the present invention, one or more syntax elements for said one or more parameters are included in coded data of the 360-degree virtual reality images. The coded data of the 360-degree virtual reality images are provided as output data. At a receiver side or a decoder side, one or more syntax elements for one or more parameters are parsed from the coded data of the 360-degree virtual reality images. A selected pyramid projection format associated with the 360-degree virtual reality images is determined based on information including said one or more parameters. The 360-degree virtual reality images are then recovered according to the selected viewport.
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Patent Agency Ranking
公开(公告)号：US20170374385A1
公开(公告)日：2017-12-28
申请号：US15629855
申请日：2017-06-22
Applicant: MEDIATEK INC.
Inventor： Chao-Chih HUANG , Hung-Chih LIN , Jian-Liang LIN , Chia-Ying LI , Shen-Kai CHANG
IPC: H04N19/597 , H04N19/176 , H04N19/105
CPC classification number: H04N19/597 , H04N19/105 , H04N19/167 , H04N19/176
Abstract: A method and apparatus of video encoding or decoding for a video encoding or decoding system applied to multi-face sequences corresponding to a 360-degree virtual reality sequence are disclosed. According the present invention, one or more multi-face sequences representing the 360-degree virtual reality sequence are derived. If Inter prediction is selected for a current block in a current face, one virtual reference frame is derived for each face of said one or more multi-face sequences by assigning one target reference face to a center of said one virtual reference frame and connecting neighboring faces of said one target reference face to said one target reference face at boundaries of said one target reference face. Then, the current block in the current face is encoded or decoded using a current virtual reference frame derived for the current face to derive an Inter predictor for the current block.
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公开(公告)号：US20170323423A1
公开(公告)日：2017-11-09
申请号：US15585224
申请日：2017-05-03
Applicant: MEDIATEK INC.
Inventor： Jian-Liang LIN , Hung-Chih LIN , Chia-Ying LI , Shen-Kai CHANG
CPC classification number: G06T3/0062 , G06T3/0087 , H04N13/139 , H04N19/597 , H04N19/70 , H04N19/88
Abstract: Methods and apparatus of processing omnidirectional images are disclosed. According to one method, a current set of omnidirectional images converted from each spherical image in a 360-degree panoramic video sequence using a selected projection format is received, where the selected projection format belongs to a projection format group comprising a cubicface format, and the current set of omnidirectional images with the cubicface format consists of six cubic faces. If the selected projection format corresponds to the cubicface format, one or more mapping syntax elements to map the current set of omnidirectional images into a current cubemap image are signaled. The coded data are then provided in a bitstream including said one or more mapping syntax elements for the current set of omnidirectional images.
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公开(公告)号：US20170105006A1
公开(公告)日：2017-04-13
申请号：US15354162
申请日：2016-11-17
Applicant: MEDIATEK INC.
Inventor： Hung-Chih LIN , Shen-Kai CHANG
IPC: H04N19/159 , H04N19/61 , H04N19/15 , H04N19/513 , H04N19/117 , H04N19/105 , H04N19/124
CPC classification number: H04N19/159 , H04N19/105 , H04N19/107 , H04N19/117 , H04N19/136 , H04N19/15 , H04N19/156 , H04N19/172 , H04N19/176 , H04N19/182 , H04N19/513
Abstract: A method and apparatus of video coding are disclosed. At the encoder side, if the current input picture is designated as a master picture, the current input picture is down-sampled to a current down-sampled picture and the current down-sampled picture is encoded using an Intra mode or an Inter mode. The current down-sampled picture only uses one or more previous reconstructed down-sampled pictures as one or more first reference pictures if coding blocks of the current down-sampled picture are coded using the Inter mode. If the current input picture is designated as a slave picture, coding blocks of the current input picture are encoded with the Inter mode by up-sampling one or more previous reconstructed down-sampled pictures and only using pixel data with one or more up-sampled pictures corresponding to said one or more up-sampled pictures as one or more second reference pictures. A corresponding decoder is also disclosed.
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公开(公告)号：US20160360236A1
公开(公告)日：2016-12-08
申请号：US15075022
申请日：2016-03-18
Applicant: MediaTek Inc.
Inventor： Chao-Chih HUANG , Shen-Kai CHANG , Hung-Chih LIN
CPC classification number: H04N19/91 , H04L65/607 , H04N19/13 , H04N19/146 , H04N19/1887 , H04N19/197 , H04N19/40 , H04N19/70
Abstract: A method and apparatus for transcoding a compressed bitstream are disclosed. The system receives a first compressed bitstream generated by applying first entropy encoding to a set of tokens. The first compressed bitstream is decoded into the set of tokens using first entropy decoding corresponding to the first entropy encoding. The set of tokens is then re-encoded into a second compressed bitstream using second entropy encoding, where the second entropy encoding and the first entropy encoding use different statistics, different initial states, or both. The system may further comprising determining one or more modified or optimal probability models associated with the set of tokens, where the second entropy encoding is based on the modified or optimal probability models.
Abstract translation: 公开了一种用于对压缩比特流进行代码转换的方法和装置。 系统接收通过将第一熵编码应用于一组令牌而产生的第一压缩比特流。 使用与第一熵编码对应的第一熵解码，将第一压缩比特流解码为令牌集合。 然后使用第二熵编码将该组令牌重新编码为第二压缩比特流，其中第二熵编码和第一熵编码使用不同的统计，不同的初始状态或两者。 该系统可以进一步包括确定与该组令牌相关联的一个或多个修改或最优概率模型，其中第二熵编码基于修改或最优概率模型。
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10.发明申请公开(公告)号：US20190026934A1
公开(公告)日：2019-01-24
申请号：US16034601
申请日：2018-07-13
Applicant: MEDIATEK INC.
Inventor： Cheng-Hsuan SHIH , Chia-Ying LI , Ya-Hsuan LEE , Hung-Chih LIN , Jian-Liang LIN , Shen-Kai CHANG
IPC: G06T15/00
Abstract: Methods and apparatus of processing 360-degree virtual reality images are disclosed. According to one method, a 2D (two-dimensional) frame is divided into multiple blocks. The multiple blocks are encoded or decoded using quantization parameters by restricting a delta quantization parameter to be within a threshold for any two blocks corresponding to two neighboring blocks on a 3D sphere. According to another embodiment, one or more guard bands are added to one or more edges that are discontinuous in the 2D frame but continuous in the 3D sphere. Fade-out process is applied to said one or more guard bands to generate one or more faded guard bands. At the decoder side, the reconstructed 2D frame is generated from the decoded extended 2D frame by cropping said one or more decoded faded guard bands or by blending said one or more decoded faded guard bands and reconstructed duplicated areas.
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