公开(公告)号：US12096044B2

公开(公告)日：2024-09-17

申请号：US18181261

申请日：2023-03-09

Applicant: Apple Inc.

Inventor： Xiaohua Yang ,  Alexandros Tourapis ,  Dazhong Zhang ,  Hang Yuan ,  Hsi-Jung Wu ,  Jae Hoon Kim ,  Jiefu Zhai ,  Ming Chen ,  Xiaosong Zhou

IPC: H04N19/90 ,  G06F3/01 ,  H04N19/52 ,  H04N19/597 ,  H04N21/2343

CPC classification number: H04N19/90 ,  G06F3/013 ,  H04N19/52 ,  H04N19/597 ,  H04N21/234345

Abstract: In communication applications, aggregate source image data at a transmitter exceeds the data that is needed to display a rendering of a viewport at a receiver. Improved streaming techniques that include estimating a location of a viewport at a future time. According to such techniques, the viewport may represent a portion of an image from a multi-directional video to be displayed at the future time, and tile(s) of the image may be identified in which the viewport is estimated to be located. In these techniques, the image data of tile(s) in which the viewport is estimated to be located may be requested at a first service tier, and the other tile in which the viewport is not estimated to be located may be requested at a second service tier, lower than the first service tier.

公开(公告)号：US20220329756A1

公开(公告)日：2022-10-13

申请号：US17846896

申请日：2022-06-22

Applicant: Apple Inc.

Inventor： Jae Hoon Kim ,  Chris Y. Chung ,  Dazhong Zhang ,  Hang Yuan ,  Hsi-Jung Wu ,  Xiaosong Zhou ,  Jiefu Zhai

IPC: H04N7/14 ,  H04N7/15 ,  G06F3/0488

Abstract: Embodiments of the present disclosure provide systems and methods for perspective shifting in a video conferencing session. In one exemplary method, a video stream may be generated. A foreground element may be identified in a frame of the video stream and distinguished from a background element of the frame. Data may be received representing a viewing condition at a terminal that will display the generated video stream. The frame of the video stream may be modified based on the received data to shift of the foreground element relative to the background element. The modified video stream may be displayed at the displaying terminal.

公开(公告)号：US11093752B2

公开(公告)日：2021-08-17

申请号：US15613130

申请日：2017-06-02

Applicant: Apple Inc.

Inventor： Jae Hoon Kim ,  Ming Chen ,  Hang Yuan ,  Jiefu Zhai ,  Dazhong Zhang ,  Xiaosong Zhou ,  Chris Chung ,  Hsi-Jung Wu

IPC: G06K9/00 ,  G06T7/292 ,  G06K9/32

Abstract: Techniques are disclosed for managing display of content from multi-view video data. According to these techniques, an object may be identified from content of the multi-view video. The object's location may be tracked across a sequence of multi-view video. The technique may extract a sub-set of video that is contained within a view window that is shifted in an image space of the multi-view video in correspondence to the tracked object's location. These techniques may be implemented either in an image source device or an image sink device.

公开(公告)号：US10999583B2

公开(公告)日：2021-05-04

申请号：US16132219

申请日：2018-09-14

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  Dazhong Zhang ,  Hang Yuan ,  Hsi-Jung Wu ,  Jae Hoon Kim ,  Jiefu Zhai ,  Ming Chen ,  Xiaosong Zhou

IPC: H04N19/29 ,  H04N19/103 ,  G09G5/14 ,  H04N21/44

Abstract: Aspects of the present disclosure provide techniques for reducing latency and improving image quality of a viewport extracted from multi-directional video communications. According to such techniques, first streams of coded video data are received from a source. The first streams include coded data for each of a plurality of tiles representing a multi-directional video, where each tile corresponding to a predetermined spatial region of the multi-directional video, and at least one tile of the plurality of tiles in the first streams contains a current viewport location at a receiver. The techniques include decoding the first streams and displaying the tile containing the current viewport location. When the viewport location at the receiver changes to include a new tile of the plurality of tiles, retrieving and decoding first streams for the new tile, displaying the decoded content for the changed viewport location, and transmitting the changed viewport location to the source.

公开(公告)号：US10992919B2

公开(公告)日：2021-04-27

申请号：US16725245

申请日：2019-12-23

Applicant: Apple Inc.

Inventor： Jae Hoon Kim ,  Ming Chen ,  Xiaosong Zhou ,  Hsi-Jung Wu ,  Dazhong Zhang ,  Hang Yuan ,  Jiefu Zhai ,  Chris Y. Chung

IPC: H04N13/161 ,  H04N19/597 ,  H04N19/70 ,  H04N5/232 ,  H04N13/243 ,  H04N13/139

Abstract: Frame packing techniques are disclosed for multi-directional images and video. According to an embodiment, a multi-directional source image is reformatted into a format in which image data from opposing fields of view are represented in respective regions of the packed image as flat image content. Image data from a multi-directional field of view of the source image between the opposing fields of view are represented in another region of the packed image as equirectangular image content. It is expected that use of the formatted frame will lead to coding efficiencies when the formatted image is processed by predictive video coding techniques and the like.

公开(公告)号：US10754242B2

公开(公告)日：2020-08-25

申请号：US15638848

申请日：2017-06-30

Applicant: Apple Inc.

Inventor： Jae Hoon Kim ,  Ming Chen ,  Xiaosong Zhou ,  Hsi-Jung Wu ,  Dazhong Zhang ,  Hang Yuan ,  Jiefu Zhai ,  Chris Y. Chung

IPC: G03B37/04 ,  G06T3/40 ,  H04N5/232 ,  H04N19/172 ,  H04N19/159 ,  G06T3/00 ,  H04N19/597 ,  H04N19/105 ,  H04N13/161

Abstract: Techniques are described for implementing format configurations for multi-directional video and for switching between them. Source images may be assigned to formats that may change during a coding session. When a change occurs between formats, video coders and decoder may transform decoded reference frames from the first format to the second format. Thereafter, new frames in the second configuration may be coded or decoded predictively using transformed reference frame(s) as source(s) of prediction. In this manner, video coders and decoders may use intra-coding techniques and achieve high efficiency in coding.

公开(公告)号：US10038919B2

公开(公告)日：2018-07-31

申请号：US14290873

申请日：2014-05-29

Applicant: Apple Inc.

Inventor： Jiefu Zhai ,  Dazhong Zhang ,  Xiaosong Zhou ,  Chris Y. Chung ,  Hsi-Jung Wu ,  Peikang Song ,  David R. Conrad ,  Jae Hoon Kim ,  Yunfei Zheng

IPC: H04N7/12 ,  H04N19/82 ,  H04N19/186

CPC classification number: H04N19/82 ,  H04N19/186

Abstract: Chroma deblock filtering of reconstructed video samples may be performed to remove blockiness artifacts and reduce color artifacts without over-smoothing. In a first method, chroma deblocking may be performed for boundary samples of a smallest transform size, regardless of partitions and coding modes. In a second method, chroma deblocking may be performed when a boundary strength is greater than 0. In a third method, chroma deblocking may be performed regardless of boundary strengths. In a fourth method, the type of chroma deblocking to be performed may be signaled in a slice header by a flag. Furthermore, luma deblock filtering techniques may be applied to chroma deblock filtering.

公开(公告)号：US20180184121A1

公开(公告)日：2018-06-28

申请号：US15390202

申请日：2016-12-23

Applicant: Apple Inc.

Inventor： Jae Hoon Kim ,  Xiaosong Zhou ,  Dazhong Zhang ,  Hang Yuan ,  Jiefu Zhai ,  Chris Y. Chung ,  Hsi-Jung Wu

IPC: H04N19/597 ,  H04N19/176 ,  H04N19/105

CPC classification number: H04N19/597 ,  H04N19/105 ,  H04N19/176 ,  H04N19/547

Abstract: Techniques are disclosed for coding video data predictively based on predictions made from spherical-domain projections of input pictures to be coded and reference pictures that are prediction candidates. Spherical projection of an input picture and the candidate reference pictures may be generated. Thereafter, a search may be conducted for a match between the spherical-domain representation of a pixel block to be coded and a spherical-domain representation of the reference picture. On a match, an offset may be determined between the spherical-domain representation of the pixel block to a matching portion of the of the reference picture in the spherical-domain representation. The spherical-domain offset may be transformed to a motion vector in a source-domain representation of the input picture, and the pixel block may be coded predictively with reference to a source-domain representation of the matching portion of the reference picture.

公开(公告)号：US20170359590A1

公开(公告)日：2017-12-14

申请号：US15585581

申请日：2017-05-03

Applicant: Apple Inc.

Inventor： Dazhong Zhang ,  Hang Yuan ,  Peikang Song ,  Jae Hoon Kim ,  Xing Wen ,  Sudeng Hu ,  Xiaosong Zhou ,  Chris Y. Chung ,  Hsi-Jung Wu

IPC: H04N19/423

CPC classification number: H04N19/423 ,  H04N19/463 ,  H04N21/44004 ,  H04N21/6373 ,  H04N21/6379

Abstract: Techniques are disclosed for managing memory allocations when coding video data according to multiple codec configurations. According to these techniques, devices may negotiate parameters of a coding session that include parameters of a plurality of different codec configurations that may be used during the coding session. A device may estimate sizes of decoded picture buffers for each of the negotiated codec configurations and allocate in its memory a portion of memory sized according to a largest size of the estimated decoded picture buffers. Thereafter, the devices may exchange coded video data. The exchange may involve decoding coded data of reference pictures and storing the decoded reference pictures in the allocated memory. During the coding session, the devices may toggle among the different negotiated codec configurations. As they do, reallocations of memory may be avoided.

公开(公告)号：US20160360220A1

公开(公告)日：2016-12-08

申请号：US14730830

申请日：2015-06-04

Applicant: Apple Inc.

Inventor： Peikang Song ,  Jae Hoon Kim ,  Xiaosong Zhou ,  Chris Y. Chung ,  Hsi-Jung Wu ,  Dazhong Zhang

IPC: H04N19/51 ,  H04N19/172 ,  H04N19/159 ,  H04N19/139 ,  H04N19/142

CPC classification number: H04N19/172 ,  H04N19/132 ,  H04N19/139 ,  H04N19/142 ,  H04N19/154 ,  H04N19/159 ,  H04N19/164

Abstract: Techniques are described for responding to changes in bandwidth that are available to transmit coded video data between an encoder and a decoder. When such changes in bandwidth occur, estimates may be derived of visual significance of coded video data that has not yet been transmitted and also video data that is next to be coded. These estimates may be compared to each other. When the estimated visual significance of the coded video data that has not yet been transmitted is greater than the estimated visual significance of the video data that is next to be coded, transmission of the coded video data that has not yet been transmitted may be prioritized over coding of the video data that is next to be coded. When the estimated visual significance of the video data that is next to be coded is greater than the estimated visual significance of the coded video data that has not yet been transmitted, coding of the video data that is next to be coded may be prioritized over transmission of the coded video data that has not yet been transmitted. Resources may be allocated to the prioritized coder operation.

Abstract translation: 描述了用于响应可用于在编码器和解码器之间传输编码视频数据的带宽变化的技术。 当这种带宽变化发生时，可能导出尚未被发送的编码视频数据的视觉重要性的估计，以及接下来被编码的视频数据。 这些估计可以相互比较。 当尚未被发送的编码视频数据的估计视觉含义大于接下来要被编码的视频数据的估计视觉有效性时，还没有发送的编码视频数据的传输可以优先于 对接下来被编码的视频数据进行编码。 当接下来被编码的视频数据的估计视觉含义大于尚未发送的编码视频数据的估计视觉有效性时，下一个被编码的视频数据的编码可以通过传输优先化 的尚未被发送的编码视频数据。 可以将资源分配给优先编码器操作。