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1. 发明授权

US11871052B1 Multi-band rate control 有权
公开(公告)号：US11871052B1
公开(公告)日：2024-01-09
申请号：US16580184
申请日：2019-09-24
申请人： Apple Inc.
发明人： Hao Pan , Haitao Guo , Ke Chen , Francesco Iacopino , Jim C. Chou , Xiaohua Yang , Linfeng Guo , Munehiro Nakazato , Krishnakanth Rapaka , Ye Cong
IPC分类号： G06F15/16 , H04N21/2343 , G02B27/00 , G06T19/00 , H04N21/2662
CPC分类号： H04N21/2343 , G02B27/0093 , G06T19/006 , H04N21/2662
摘要： In one implementation, a method of generating a bit stream encoding a video stream is performed by a device including one or more processors and non-transitory memory. The method includes decomposing a video stream into a plurality of frequency band video streams. The method includes determining a target bitrate and determining, for each frequency band video stream, a respective frequency band bit rate based on the target bit rate. The method includes encoding each of the plurality of frequency band video streams at its respective frequency band bit rate and transmitting, over a channel, each encoded frequency band video stream.

2. 发明授权

US11606574B2 Efficient coding of source video sequences partitioned into tiles 有权
公开(公告)号：US11606574B2
公开(公告)日：2023-03-14
申请号：US16882819
申请日：2020-05-26
申请人： Apple Inc.
发明人： Dazhong Zhang , Peikang Song , Beibei Wang , Giribalan Gopalan , Albert E. Keinath , Christopher M. Garrido , David R. Conrad , Hsi-Jung Wu , Ming Jin , Hang Yuan , Xiaohua Yang , Xiaosong Zhou , Vikrant Kasarabada , Davide Concion , Eric L. Chien , Bess C. Chan , Karthick Santhanam , Gurtej Singh Chandok
IPC分类号： H04N19/507 , H04N19/65
摘要： Techniques are disclosed for coding video data in which frames from a video source are partitioned into a plurality of tiles of common size, and the tiles are coded as a virtual video sequence according to motion-compensated prediction, each tile treated as having respective temporal location of the virtual video sequence. The coding scheme permits relative allocation of coding resources to tiles that are likely to have greater significance in a video coding session, which may lead to certain tiles that have low complexity or low motion content to be skipped during coding of the tiles for select source frames. Moreover, coding of the tiles may be ordered to achieve low coding latencies during a coding session.

3. 发明申请

US20180352240A1 Generalized Temporal Sub-Layering Frame Work 审中-公开
公开(公告)号：US20180352240A1
公开(公告)日：2018-12-06
申请号：US15613172
申请日：2017-06-03
申请人： Apple Inc.
发明人： Krishnakanth Rapaka , Mukta Gore , Sunder Venkateswaran , Xiaohua Yang , Xiang Fu , Francesco Iacopino , Linfeng Guo
IPC分类号： H04N19/187 , H04N19/51 , H04N19/31 , H04N19/39
摘要： Techniques for encoding video with temporal layering are described, comprising predicting a sequence of pictures with a motion prediction reference pattern having a number of virtual temporal layers, and encoding the sequence of pictures into an encoded bitstream with a temporal layering syntax, wherein a number of signaled temporal layers is less than the number of virtual temporal layers. The number of signaled temporal layers may be determined from a target highest frame rate, a target base layer frame rate, and the number of virtual temporal layers.

4. 发明申请

US20180302621A1 Techniques for Calculation of Quantization Matrices in Video Coding 审中-公开
公开(公告)号：US20180302621A1
公开(公告)日：2018-10-18
申请号：US15487853
申请日：2017-04-14
申请人： Apple Inc.
发明人： Xiang Fu , Xiaohua Yang , Linfeng Guo , Francesco Iacopino , Krishna Rapaka , Felix Chou , Mukta Gore
IPC分类号： H04N19/124 , H04L29/06 , H04N19/105 , H04N19/117 , H04N19/176 , H04N19/61 , H04N19/85
CPC分类号： H04N19/124 , H04L65/4069 , H04L65/602 , H04L65/607 , H04N19/105 , H04N19/117 , H04N19/126 , H04N19/136 , H04N19/154 , H04N19/176 , H04N19/463 , H04N19/61 , H04N19/85
摘要： Techniques are disclosed for developing quantization matrices for use in video coding. According to these techniques a first quantization matrix may be derived from a second quantization matrix by scaling quantization values of the second quantization matrix by scaling parameters. The scaling parameters may increase according to distance between each matrix position and a matrix origin, they may be derived from characteristics of a video sequence to be coded, or both. The first quantization matrix may be communicated to a decoder. Thereafter, a video sequence may be coded predictively. As part of the coding, pixel data of the video sequence may be transformed to a plurality of frequency domain coefficients, and the frequency domain coefficients may be quantized according to the first quantization matrix.

5. 发明申请

US20170272780A1 Extended YCC Format for Backward-Compatible P3 Camera Video 审中-公开
公开(公告)号：US20170272780A1
公开(公告)日：2017-09-21
申请号：US15070620
申请日：2016-03-15
申请人： Apple Inc.
发明人： Hao Pan , Yingjun Bai , Xuemei Zhang , Haitao Guo , Munehiro Nakazato , Xiaohua Yang
IPC分类号： H04N19/86 , H04N19/44 , H04N19/186 , H04N19/12 , H04N19/156
CPC分类号： H04N19/86 , H04N1/6058 , H04N19/12 , H04N19/156 , H04N19/186 , H04N19/44 , H04N19/85
摘要： This disclosure relates to a wide gamut encoder capable of receiving a wide gamut color image in accordance with a wide gamut standard. The encoder can encode one or more wide gamut color image pixel values into portions of narrow gamut encoding elements for transmission to a video encoder. The encoder can implement an advanced extended YCC format that is backward compatible with a P3 color gamut.

6. 发明申请

US20160360234A1 Techniques For Resource Conservation During Performance Of Intra Block Copy Prediction Searches 审中-公开
标题翻译：在块内复制预测搜索中执行资源节约的技术
公开(公告)号：US20160360234A1
公开(公告)日：2016-12-08
申请号：US15172064
申请日：2016-06-02
申请人： Apple Inc.
发明人： Alexandros Michael Tourapis , David William Singer , Haitao Guo , Hsi-Jung Wu , Sorin C. Cismas , Xiaohua Yang , Yeping Su , Dazhong Zhang
IPC分类号： H04N19/593 , H04N19/182 , H04N19/176
CPC分类号： H04N19/593 , H04N19/117 , H04N19/156 , H04N19/174 , H04N19/176 , H04N19/182
摘要： Methods are described for encoding and decoding blocks of image data using intra block copying (IBC). A source block for intra block copying is selected from a source region of a current image that is closer to the current block than a threshold, wherein the source region does not include a portion of the current image that is further from the current block than the threshold.
摘要翻译：描述了使用块内复制（IBC）对图像数据块进行编码和解码的方法。从当前图像的比当前块更靠近阈值的源区域中选择用于帧内块复制的源块，其中源区域不包括当前图像的比当前块更远的部分，阈。

7. 发明申请

US20210096023A1 Ambient Headroom Adaptation 有权
公开(公告)号：US20210096023A1
公开(公告)日：2021-04-01
申请号：US16586411
申请日：2019-09-27
申请人： Apple Inc.
发明人： Xiaohua Yang , Ruiqi Hu , Hao Pan , Vaidyanath Mani , Qiang Wang , Haiyan He , Xin Wang , Gui Xie , Jin Wook Chang
IPC分类号： G01J1/42 , G06T5/00 , G06T7/90 , G06T7/11 , H04N1/60
摘要： A device comprises memory, a display characterized by a display characteristic, and processors coupled to the memory. The processors execute instructions causing the processors to receive data indicative of the display characteristic, data indicative of ambient lighting, and data indicative of content characteristics for a content item; determine a tone mapping curve for the content item based on the data indicative of content characteristics; determine a first, so-called “anchor” point along the tone mapping curve; modify a first portion of the tone mapping curve below the anchor point based on the data indicative of ambient lighting; modify a second portion of the tone mapping curve above the anchor point based on the data indicative of the display characteristic; perform tone mapping for the content item based on the modified toned mapping curve to obtain a tone mapped content item; and cause the display to display the tone mapped content item.

8. 发明授权

US10757445B2 Techniques for resource conservation during performance of intra block copy prediction searches 有权
公开(公告)号：US10757445B2
公开(公告)日：2020-08-25
申请号：US16173105
申请日：2018-10-29
申请人： Apple Inc.
发明人： Alexandros Tourapis , David W. Singer , Haitao Guo , Hsi-Jung Wu , Sorin C. Cismas , Xiaohua Yang , Yeping Su , Dazhong Zhang
IPC分类号： H04N19/593 , H04N19/156 , H04N19/44 , H04N19/176 , H04N19/182 , H04N19/174
摘要： Methods are described for encoding and decoding blocks of image data using intra block copying (IBC). A source block for intra block copying is selected from a source region of a current image that is closer to the current block than a threshold, wherein the source region does not include a portion of the current image that is further from the current block than the threshold.

9. 发明申请

US20160353107A1 ADAPTIVE QUANTIZATION PARAMETER MODULATION FOR EYE SENSITIVE AREAS 审中-公开
标题翻译：用于眼睛敏感区域的自适应量化参数调整
公开(公告)号：US20160353107A1
公开(公告)日：2016-12-01
申请号：US14721903
申请日：2015-05-26
申请人： Apple Inc.
发明人： Jian Lou , Congxia Dai , Hao Pan , Xiaohua Yang
IPC分类号： H04N19/126 , H04N19/184 , H04N19/172 , H04N19/182 , H04N19/176
CPC分类号： H04N19/176 , H04N19/124 , H04N19/136 , H04N19/167 , H04N19/182
摘要： Methods and systems provide an adaptive quantization parameter (QP) modulation scheme for video coding and compression that is sensitive to user visual perception. In an embodiment, the method includes detecting an eye sensitive region, where a region is considered sensitive based on a noticeability of a visual effect. The method includes estimating encoding parameters for image content in the detected eye sensitive region. The method further includes encoding the detected eye sensitive region with the estimated encoding parameters. The estimating the encoding parameters may be based on, among other things, a variance, a motion vector, a DC value, an edge value, and external information such as a user command or screen content. The encoding may include storing an average or maximum sum of square differences (SSD) value for a detected eye sensitive area and adjusting a QP value based on a comparison of the SSD value to generated threshold values.
摘要翻译：方法和系统为视频编码和压缩提供了一种对用户视觉感知敏感的自适应量化参数（QP）调制方案。在一个实施例中，该方法包括基于视觉效果的显着性检测区域被认为是敏感的眼睛敏感区域。该方法包括估计检测到的眼睛敏感区域中的图像内容的编码参数。该方法还包括用所估计的编码参数来编码检测到的眼睛敏感区域。估计编码参数可以基于方差，运动矢量，DC值，边缘值以及诸如用户命令或屏幕内容的外部信息。编码可以包括存储检测到的眼睛敏感区域的平均差异（SSD）值的平均或最大和，并且基于SSD值与生成的阈值的比较来调整QP值。

10. 发明授权

US12096044B2 Adaptive coding and streaming of multi-directional video 有权
公开(公告)号：US12096044B2
公开(公告)日：2024-09-17
申请号：US18181261
申请日：2023-03-09
申请人： Apple Inc.
发明人： Xiaohua Yang , Alexandros Tourapis , Dazhong Zhang , Hang Yuan , Hsi-Jung Wu , Jae Hoon Kim , Jiefu Zhai , Ming Chen , Xiaosong Zhou
IPC分类号： H04N19/90 , G06F3/01 , H04N19/52 , H04N19/597 , H04N21/2343
CPC分类号： H04N19/90 , G06F3/013 , H04N19/52 , H04N19/597 , H04N21/234345
摘要： 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.

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