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    Method and apparatus for generating and encoding projection-based frame with 360-degree content represented in projection faces packed in segmented sphere projection layout
    11.
    发明授权
    Method and apparatus for generating and encoding projection-based frame with 360-degree content represented in projection faces packed in segmented sphere projection layout 有权

    公开(公告)号：US10593012B2

    公开(公告)日：2020-03-17

    申请号：US15927028

    申请日：2018-03-20

    Applicant: MEDIATEK INC.

    Inventor： Ya-Hsuan Lee ,  Hung-Chih Lin ,  Jian-Liang Lin ,  Shen-Kai Chang

    IPC: G06T3/00

    Abstract: A video processing method includes receiving an omnidirectional content corresponding to a sphere, generating a projection-based frame according to at least the omnidirectional content and a segmented sphere projection (SSP) format, and encoding, by a video encoder, the projection-based frame to generate a part of a bitstream. The projection-based frame has a 360-degree content represented by a first circular projection face, a second circular projection face, and at least one rectangular projection face packed in an SSP layout. A north polar region of the sphere is mapped onto the first circular projection face. A south polar region of the sphere is mapped onto the second circular projection face. At least one non-polar ring-shaped segment between the north polar region and the south polar region of the sphere is mapped onto said at least one rectangular projection face.

    Method and apparatus for processing projection-based frame with at least one projection face generated using non-uniform mapping
    14.
    发明授权
    Method and apparatus for processing projection-based frame with at least one projection face generated using non-uniform mapping 有权

    公开(公告)号：US10356386B2

    公开(公告)日：2019-07-16

    申请号：US15766829

    申请日：2018-04-03

    Applicant: MEDIATEK INC.

    Inventor： Ya-Hsuan Lee ,  Peng Wang ,  Jian-Liang Lin ,  Shen-Kai Chang

    IPC: H04N13/161 ,  G06T3/00 ,  H04N13/111

    Abstract: A video processing method includes obtaining projection face(s) from an omnidirectional content of a sphere, and obtaining a re-sampled projection face by re-sampling at least a portion of a projection face of the projection face(s) through non-uniform mapping. The omnidirectional content of the sphere is mapped onto the projection face(s) via a 360-degree Virtual Reality (360 VR) projection. The projection face has a first source region and a second source region. The re-sampled projection face has a first re-sampled region and a second re-sampled region. The first re-sampled region is derived from re-sampling the first source region with a first sampling density. The second re-sampled region is derived from re-sampling the second source region with a second sampling density that is different from the first sampling density.

    Method and apparatus using software engine and hardware engine collaborated with each other to achieve hybrid video encoding
    16.
    发明授权
    Method and apparatus using software engine and hardware engine collaborated with each other to achieve hybrid video encoding 有权

    公开(公告)号：US10057590B2

    公开(公告)日：2018-08-21

    申请号：US15265896

    申请日：2016-09-15

    Applicant: MediaTek Inc.

    Inventor： Chao-Chih Huang ,  Ting-An Lin ,  Shen-Kai Chang ,  Han-Liang Chou

    IPC: H04N7/12 ,  H04N19/42 ,  H04N19/43 ,  H04N19/433 ,  H04N19/423

    CPC classification number: H04N19/439 ,  H04N19/42 ,  H04N19/423 ,  H04N19/43 ,  H04N19/433

    Abstract: A hybrid video encoding method and system using a software engine and a hardware engine. The software engine receives coding unit data associated with a current picture, and performs a first part of the video encoding operation by executing instructions. The first part of the video encoding operation generates an inter predictor and control information corresponding to the coding unit data of the current picture. The first part of the video encoding operation stores the inter predictor into an off-chip memory. The hardware engine performs a second part of the video encoding operation according to the control information. The second part of the video encoding operation receives the inter predictor, and subtracts the inter predictor from the coding unit data to generate a residual signal. The second part of the video encoding operation then transforms and quantizes the residual signal to generate transformed and quantized residual signal, and encodes the transformed and quantized residual signal to generate an encoded video bitstream.

    Method and apparatus of image formation and compression of cubic images for 360 degree panorama display
    19.
    发明授权
    Method and apparatus of image formation and compression of cubic images for 360 degree panorama display 有权

    公开(公告)号：US10909656B2

    公开(公告)日：2021-02-02

    申请号：US16359028

    申请日：2019-03-20

    Applicant: MEDIATEK INC.

    Inventor： Hung-Chih Lin ,  Shen-Kai Chang

    IPC: G06T3/00 ,  G06T3/40 ,  H04N19/179 ,  H04N19/186 ,  H04N19/70 ,  G06T7/90 ,  H04N5/232

    Abstract: Methods and apparatus of processing cube face images are disclosed. According one method, each set of six cubic faces is converted into one rectangular assembled image by assembling each set of six cubic faces to maximize a number of continuous boundaries and to minimize a number of discontinuous boundaries. Each continuous boundary corresponds to one boundary between two connected faces with continuous contents from one face to another face. Each discontinuous boundary corresponds to one boundary between two connected faces with discontinuous contents from one face to another face. The method may further comprise applying video coding to the video sequence outputting the compressed data of the video sequence. According to another method, a fully-connected cubic-face image representing an unfolded image from the six faces of the cube is generated and the blank areas are filled with padding data to form a rectangular assembled image.

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