Mediatek Corporation

Taiwan Semiconductor Manufacturing Comp. Ltd.

Chia-Ying Li

Shen-Kai Chang

Jian-Liang Lin

Hung-Chih Lin

Chao-Chih Huang

Ya-Hsuan Lee

Chi-Cheng Ju

Hui Ou Yang

Cheng-Hsuan Shih

Hui Ouyang

Yiou-Wen Cheng

Ching-Lun Lai

Chao-Ling Hsu

Ming-Shiou Kuo

Wei-Ching Wu

Le Shi

Xin-Wei Shih

Zong-Han Li

A video processing method includes: receiving an omnidirectional content corresponding to a sphere, obtaining projection faces from the omnidirectional content, and creating a projection-based frame by generating at least one padding region and packing the projection faces and said at least one padding region in a 360 VR projection layout. The projection faces packed in the 360 VR projection layout include a first projection face and a second projection face, where there is an image content discontinuity edge between the first projection face and the second projection face if the first projection face connects with the second projection face. The at least one padding region packed in the 360 VR projection layout includes a first padding region, where the first padding region connects with the first projection face and the second projection face for isolating the first projection face from the second projection face in the 360 VR projection layout.

Method and apparatus for generating and encoding projection-based frame that includes at least one padding region and at least one projection face packed in 360-degree virtual reality projection layout

Methods and apparatus of processing 360-degree virtual reality images are disclosed. According to one method, the method receives coded data for an extended 2D (two-dimensional) frame including an encoded 2D frame with one or more encoded guard bands, wherein the encoded 2D frame is projected from a 3D (three-dimensional) sphere using a target projection, wherein said one or more encoded guard bands are based on a blending of one or more guard bands with an overlapped region when the overlapped region exists. The method then decodes the coded data into a decoded extended 2D frame including a decoded 2D frame with one or more decoded guard bands, and derives a reconstructed 2D frame from the decoded extended 2D frame.

Method and apparatus for reduction of artifacts at discontinuous boundaries in coded virtual-reality images

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.

Method and apparatus for selective filtering of cubic-face frames

A video processing method includes receiving a bitstream, and decoding, by a video decoder, the bitstream to generate a decoded frame. The decoded frame is a projection-based frame that has a 360-degree image/video content represented by triangular projection faces packed in a triangle-based projection layout. An omnidirectional image/video content of a viewing sphere is mapped onto the triangular projection faces via a triangle-based projection of the viewing sphere. An equator of the viewing sphere is not mapped along any side of each of the triangular projection faces.

Method and apparatus for decoding projection based frame with 360-degree content represented by triangular projection faces packed in triangle-based projection layout

A projection-based frame is generated according to an omnidirectional video frame and a triangle-based projection layout. The projection-based frame has a 360-degree image content represented by triangular projection faces assembled in the triangle-based projection layout. A 360-degree image content of a viewing sphere is mapped onto the triangular projection faces via a triangle-based projection of the viewing sphere. One side of a first triangular projection face has contact with one side of a second triangular projection face, one side of a third triangular projection face has contact with another side of the second triangular projection face. One image content continuity boundary exists between one side of the first triangular projection face and one side of the second triangular projection face, and another image content continuity boundary exists between one side of the third triangular projection face and another side of the second triangular projection face.

Method and apparatus for generating projection-based frame with 360-degree image content represented by triangular projection faces assembled in triangle-based projection layout

A video processing method includes receiving a bitstream, and decoding, by a video decoder, the bitstream to generate a decoded frame. The decoded frame is a projection-based frame that has a 360-degree image/video content represented by triangular projection faces packed in an octahedron projection layout. An omnidirectional image/video content of a viewing sphere is mapped onto the triangular projection faces via an octahedron projection of the viewing sphere. An equator of the viewing sphere is not mapped along any side of each of the triangular projection faces.

Method and apparatus for decoding projection-based frame with 360-degree content represented by triangular projection faces packed in octahedron projection layout

A projection-based frame is generated according to an omnidirectional video frame and an octahedron projection layout. The projection-based frame has a 360-degree image content represented by triangular projection faces assembled in the octahedron projection layout. A 360-degree image content of a viewing sphere is mapped onto the triangular projection faces via an octahedron projection of the viewing sphere. One side of a first triangular projection face has contact with one side of a second triangular projection face, one side of a third triangular projection face has contact with another side of the second triangular projection face. One image content continuity boundary exists between one side of the first triangular projection face and one side of the second triangular projection face, and another image content continuity boundary exists between one side of the third triangular projection face and another side of the second triangular projection face.

Method and apparatus for generating projection-based frame with 360-degree image content represented by triangular projection faces assembled in octahedron projection layout

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.

A video processing method includes receiving a bitstream, processing the bitstream to obtain at least one syntax element from the bitstream, and decoding the bitstream to generate a current decoded frame having a rotated 360-degree image/video content represented in a 360-degree Virtual Reality (360 VR) projection format. The at least one syntax element signaled via the bitstream indicates rotation information of content-oriented rotation that is involved in generating the rotated 360-degree image/video content, and includes a first syntax element. When the content-oriented rotation is enabled, the first syntax element indicates a rotation degree along a specific rotation axis.

Method and apparatus having video decoding function with syntax element parsing for obtaining rotation information of content-oriented rotation applied to 360-degree image content or 360-degree video content represented in projection format

A video processing method includes: receiving an omnidirectional image/video content corresponding to a viewing sphere, generating a sequence of projection-based frames according to the omnidirectional image/video content and a viewport-based cube projection layout, and encoding the sequence of projection-based frames to generate a bitstream. Each projection-based frame has a 360-degree image/video content represented by rectangular projection faces packed in the viewport-based cube projection layout. The rectangular projection faces include a first rectangular projection face, a second rectangular projection face, a third rectangular projection face, a fourth rectangular projection face, a fifth rectangular projection face, and a sixth rectangular projection face split into partial rectangular projection faces. The first rectangular projection face corresponds to user's viewport, and is enclosed by a surrounding area composed of the second rectangular projection face, the third rectangular projection face, the fourth rectangular projection face, the fifth rectangular projection face, and the partial rectangular projection faces.

Method and apparatus for generating and encoding projection-based frame with 360-degree content represented by rectangular projection faces packed in viewport-based cube projection layout

A video processing method includes: receiving a current input frame having a 360-degree image/video content represented in a 360-degree Virtual Reality (360 VR) projection format, applying content-oriented rotation to the 360-degree image/video content in the current input frame to generate a content-rotated frame having a rotated 360-degree image/video content represented in the 360 VR projection format, encoding the content-rotated frame to generate a bitstream, and signaling at least one syntax element via the bitstream, wherein the at least one syntax element is set to indicate rotation information of the content-oriented rotation.

Method and apparatus having video encoding function with syntax element signaling of rotation information of content-oriented rotation applied to 360-degree image content or 360-degree video content represented in projection format and associated method and apparatus having video decoding function

Representative systems and methods for preventing or otherwise reducing extreme-ultraviolet-induced material property changes (e.g., layer thickness shrinkage) include one or more thermal treatments to at least partially stabilize a material forming a material layer disposed over a substrate prior to extreme ultraviolet (EUV) exposure (e.g., wavelengths spanning about 124 nm to about 10 nm) attendant to photolithographic processing. Representative systems and methods provide for reduction of average compressive stress in a material layer after thermal treatment prior to extreme EUV photolithographic patterning. Representative thermal treatments may include one or more annealing processes, ultraviolet (UV) radiation treatments, ion implantations, ion bombardments, plasma treatments, surface baking treatments, surface coating treatments, surface ashing treatments, or pulsed laser treatments.

Reducing EUV-induced material property changes

A video encoding method includes: setting a 360-degree Virtual Reality (360 VR) projection layout of projection faces, wherein the projection faces have a plurality of triangular projection faces located at a plurality of positions in the 360 VR projection layout, respectively; encoding a frame having a 360-degree image content represented by the projection faces arranged in the 360 VR projection layout to generate a bitstream; and for each position included in at least a portion of the positions, signaling at least one syntax element via the bitstream, wherein the at least one syntax element is set to indicate at least one of an index of a triangular projection view filled into a corresponding triangular projection face located at the position and a rotation angle of content rotation applied to the triangular projection view filled into the corresponding triangular projection face located at the position.

Video encoding method and apparatus with syntax element signaling of employed projection layout and associated video decoding method and apparatus

An audio synchronization method includes: receiving a first audio signal from a first recording device; receiving a second audio signal from a second recording device; performing a correlation operation upon the first audio signal and the second audio signal to align a first pattern of the first audio signal and the first pattern of the second audio signal; after the first patterns of the first audio signal and the second audio signal are aligned, calculating a difference between a second pattern of the first audio signal and the second pattern of the second audio signal; and obtaining a starting-time difference between the first audio signal and the second audio signal for audio synchronization according to the difference between the second pattern of the first audio signal and the second pattern of the second audio signal.

Audio synchronization method and associated electronic device

A video processing method includes: receiving an omnidirectional image/video content corresponding to a viewing sphere, generating a sequence of projection-based frames according to the omnidirectional image/video content and an octahedron projection layout, and encoding, by a video encoder, the sequence of projection-based frames to generate a bitstream. Each projection-based frame has a 360-degree image/video content represented by triangular projection faces packed in the octahedron projection layout. The omnidirectional image/video content of the viewing sphere is mapped onto the triangular projection faces via an octahedron projection of the viewing sphere. An equator of the viewing sphere is not mapped along any side of each of the triangular projection faces.

Method and apparatus for generating and encoding projection-based frame with 360-degree content represented by triangular projection faces packed in octahedron projection layout

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Taipei, Taiwan

Chia-Ying Li