公开(公告)号：US08724017B2

公开(公告)日：2014-05-13

申请号：US13677887

申请日：2012-11-15

Applicant: Apple Inc.

Inventor： Douglas S. Price ,  Xiaosong Zhou ,  Hsi-Jung Wu

IPC: H04N5/235

CPC classification number: H04N5/235 ,  H04N5/2351 ,  H04N5/243 ,  H04N2007/145

Abstract: Systems, methods, and a computer readable medium for performing auto exposure (AE) techniques that are beneficial in variable lighting conditions—and particularly applicable to handheld and/or mobile videoconferencing applications—are disclosed herein. Handheld and/or mobile videoconferencing applications—unlike their fixed camera counterparts—are often exposed to a wide variety of rapidly changing lighting and scene conditions, and thus face a difficult trade-off between adjusting exposure parameter values too frequently or not frequently enough. In personal electronic devices executing such handheld and/or mobile videoconferencing applications, it may be desirable to: use a small, centered, and center-weighted exposure metering region; set a relatively low brightness target value; and adjust the camera's exposure parameter values according to a distance-dependent convergence speed function. The use of such techniques, in conjunction with a relatively large stability region, may also improve the quality of a video encoder's temporal predictions—and thus video quality—in videoconferencing applications.

Abstract translation: 本文公开了用于执行可变照明条件有利的自动曝光（AE）技术的系统，方法和计算机可读介质，并且特别适用于手持和/或移动视频会议应用。 手持和/或移动视频会议应用程序（与固定摄像机对应的设备不同）通常会受到各种快速变化的照明和场景条件的影响，因此在过多调整曝光参数值或不够频繁地面临困难的折衷。 在执行这种手持和/或移动视频会议应用的个人电子设备中，可能需要：使用小的，中心的和中心加权的曝光计量区域; 设定相对较低的亮度目标值; 并根据距离相关的收敛速度功能调整相机的曝光参数值。 使用这样的技术结合相对较大的稳定性区域，也可以提高视频编码器在视频会议应用中的时间预测的质量，从而提高视频质量。

公开(公告)号：US20130329798A1

公开(公告)日：2013-12-12

申请号：US13631793

申请日：2012-09-28

Applicant: APPLE INC.

Inventor： Hsi-Jung Wu ,  Xiaosong Zhou

IPC: H04N7/32

CPC classification number: H04N19/65 ,  H04N19/105 ,  H04N19/107 ,  H04N19/172

Abstract: A video coding system may initiate coding of a new coding session with reference to an “inferred key frame” that is known both to an encoder and a decoder before a coding session begins. The inferred key frame need not be transmitted between the encoder and decoder via the channel. Instead, the inferred key frame may be stored locally at the encoder and the decoder. Frames coded at the onset of a video coding session may be coded with reference to the inferred key frame, which increases the likelihood a decoder will receive a frame it can decode properly and accelerate the rate at which the decoder generates recovered video data. Inferred key frames may be used as prediction references to recover from transmission errors.

Abstract translation: 参考在编码会话开始之前编码器和解码器已知的“推断的关键帧”，视频编码系统可以启动对新编码会话的编码。 所推断的关键帧不需要经由信道在编码器和解码器之间传输。 相反，所推断的关键帧可以本地存储在编码器和解码器处。 可以参考推断的关键帧来对视频编码会话开始时编码的帧进行编码，这增加了解码器可以正确接收到帧的可能性，并且加速了解码器生成恢复的视频数据的速率。 可以将推断的关键帧用作从传输错误中恢复的预测参考。

公开(公告)号：US20130222515A1

公开(公告)日：2013-08-29

申请号：US13663005

申请日：2012-10-29

Applicant: Apple Inc.

Inventor： Joe S. Abuan ,  Xiaosong Zhou ,  Sundararaman V. Shiva ,  Hsi-Jung Wu ,  Yan Yang ,  Hyeonkuk Jeong ,  James O. Normile ,  Chris Y. Chung ,  Roberto Garcia ,  Thomas C. Jansen

IPC: H04N7/14

CPC classification number: H04W40/12 ,  H04L45/306 ,  H04L45/70 ,  H04N7/14 ,  H04W40/06 ,  H04W72/046 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/164 ,  Y02D70/322 ,  Y02D70/34

Abstract: A wireless device described herein can use information on data flow, in addition to indications from the physical network, to decide on suitable bandwidth usage for audio and video information. This data flow information is further used to determine an efficient network route to use for high-quality reception and transmission of audio and video data, as well as the appropriate time to switch between available network routes to improve bandwidth performance.

Abstract translation: 除了来自物理网络的指示之外，这里描述的无线设备可以使用关于数据流的信息来决定音频和视频信息的适当带宽使用。 该数据流信息还用于确定用于音频和视频数据的高质量接收和传输的有效网络路由，以及在可用网络路由之间切换以提高带宽性能的适当时间。

公开(公告)号：US20130195183A1

公开(公告)日：2013-08-01

申请号：US13686805

申请日：2012-11-27

Applicant: Apple Inc.

Inventor： Jiefu Zhai ,  Xiaosong Zhou ,  Hsi-Jung Wu

IPC: H04N7/26

CPC classification number: H04N19/50 ,  H04N19/117 ,  H04N19/162 ,  H04N19/172 ,  H04N19/85

Abstract: A system and method for using camera capture settings and related metadata to estimate the parameters for encoding a frame of the captured video data and to modify reference frames to accommodate detected camera setting changes. According to an embodiment, global brightness and color changes in video capture may be modeled by performing a sequence of transform operations on the reference frames to further improve the coding efficiency of a video coding system.

Abstract translation: 一种用于使用相机拍摄设置和相关元数据来估计用于对所捕获的视频数据的帧进行编码的参数并修改参考帧以适应检测到的相机设置改变的系统和方法。 根据实施例，可以通过对参考帧执行变换操作的序列来建模视频捕获中的全局亮度和颜色变化，以进一步提高视频编码系统的编码效率。