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31. 发明授权

US08005023B2 Client-side echo cancellation for multi-party audio conferencing 有权
标题翻译：客户端回声消除多方音频会议
公开(公告)号：US08005023B2
公开(公告)日：2011-08-23
申请号：US11763224
申请日：2007-06-14
申请人： Junlin Li , Li-wei He , Dinei Florencio
发明人： Junlin Li , Li-wei He , Dinei Florencio
IPC分类号： H04L12/16 , H04B3/20
CPC分类号： H04L12/16
摘要： A “Client-Side Echo Canceller” provides a unique system and method for reducing Multipoint Control Unit (MCU) computational overhead in a multi-point audio conference. In general, the local audio input signal of each client is transmitted in real-time to the MCU. The MCU then combines the audio input signals of all clients to create a single composite signal that is transmitted back to all clients in real-time. Each client then locally processes the composite signal to remove each client's local contribution to the composite signal prior to local playback in order to eliminate a local echo of each client's local audio input. In various embodiments, local cancellation of the local audio input from the composite signal is performed on either a time domain or a transform domain representation of the composite signal. Further, since each client receives the same signal, MCU transmission bandwidth can be reduced via multicast transmissions.
摘要翻译： “客户端回声消除器”提供了一种用于在多点音频会议中减少多点控制单元（MCU）计算开销的独特系统和方法。通常，每个客户端的本地音频输入信号实时传输到MCU。然后，MCU组合所有客户端的音频输入信号，以创建单个复合信号，并将其实时传输回所有客户端。然后，每个客户端本地处理复合信号以在本地回放之前去除每个客户端对复合信号的局部贡献，以便消除每个客户端的本地音频输入的本地回波。在各种实施例中，在复合信号的时域或变换域表示上执行来自复合信号的本地音频输入的局部消除。此外，由于每个客户端接收到相同的信号，所以可以通过多播传输来减少MCU传输带宽。

32. 发明授权

US07924655B2 Energy-based sound source localization and gain normalization 有权
标题翻译：基于能量的声源定位和增益归一化
公开(公告)号：US07924655B2
公开(公告)日：2011-04-12
申请号：US11623643
申请日：2007-01-16
申请人： Zicheng Liu , Zhengyou Zhang , Li-wei He , Philip A. Chou , Minghua Chen
发明人： Zicheng Liu , Zhengyou Zhang , Li-wei He , Philip A. Chou , Minghua Chen
IPC分类号： H04R5/02
CPC分类号： G01S11/14 , G01S5/30 , H04M3/56 , H04N7/141 , H04N7/15 , H04R3/005 , H04R2420/07
摘要： An energy based technique to estimate the positions of people speaking from an ad hoc network of microphones. The present technique does not require accurate synchronization of the microphones. In addition, a technique to normalize the gains of the microphones based on people's speech is presented, which allows aggregation of various audio channels from the ad hoc microphone network into a single stream for audio conferencing. The technique is invariant of the speaker's volumes thus making the system easy to deploy in practice.
摘要翻译：一种基于能量的技术来估计从麦克风的自组织网络发言的人的位置。本技术不需要麦克风的准确同步。此外，提出了一种基于人们的语音来归一化麦克风的增益的技术，其允许将各种音频频道从专用麦克风网络聚合成用于音频会议的单个流。该技术是扬声器音量不变的，从而使得系统在实践中容易部署。

33. 发明申请

US20080209327A1 Persistent spatial collaboration 有权
标题翻译：持续的空间协作
公开(公告)号：US20080209327A1
公开(公告)日：2008-08-28
申请号：US11711314
申请日：2007-02-27
申请人： Steven M. Drucker , Aamer Hydrie , Li-wei He , Rajesh K. Hegde , Zhengyou Zhang
发明人： Steven M. Drucker , Aamer Hydrie , Li-wei He , Rajesh K. Hegde , Zhengyou Zhang
IPC分类号： G06F3/00
CPC分类号： G06F9/542 , G06F2209/544 , G06F2209/546 , G06Q10/10
摘要： Persistent, spatial collaboration on the web supports a free-form, user-intuitive approach to a variety of projects and activities. Users can place differing object types at any time any where on a web page and/or the system can automatically, and with no user effort, affect object placement based on one or more meta data characteristics. A user can, in real-time, see changes made by another user to a web page, and, if desired, react accordingly, enabling true collaboration even if the various users are at remote locations. The flexibility of the methodology and system provides a platform for users to engage in projects and activities in a manner and environment suited to the users' mind sets, creativity, and natural proclivities.
摘要翻译：持续的，在网络上的空间协作支持对各种项目和活动的自由形式，用户直观的方法。用户可以随时在网页和/或系统上自动放置不同的对象类型，并且无需用户努力，就会根据一个或多个元数据特征影响对象放置。用户可以实时地查看另一用户对网页所做的更改，如果需要，还可以进行相应的反应，即使各个用户位于偏远的位置也能实现真正的协作。方法学和系统的灵活性为用户提供了一个适合用户心态，创造力和自然倾向的方式和环境参与项目和活动的平台。

34. 发明授权

US07417983B2 Decentralized architecture and protocol for voice conferencing 有权
标题翻译：语音会议的分散架构和协议
公开(公告)号：US07417983B2
公开(公告)日：2008-08-26
申请号：US11277905
申请日：2006-03-29
申请人： Li-wei He , Dinei A. Florencio , Yong Rui
发明人： Li-wei He , Dinei A. Florencio , Yong Rui
IPC分类号： H04L12/66
CPC分类号： H04L12/1822 , H04L67/104 , H04L67/1061
摘要： A decentralized computer network architecture and method that gathers metadata from local and remote clients and, based on that metadata, locally makes a decision whether to send a packet over the network. Each client listens to what other clients are doing, and only sends when the total number of concurrent speakers is below some threshold. In a multi-party voice conferencing embodiment, the threshold is a number of concurrent speakers that is restricted to less than a certain number. Under the decentralized computer network architecture, the type of network topology used to connect the clients is flexible, as long as each client is running a peer-aware system to decide locally whether to send their packets. The decentralized computer network architecture and method is distributed to run on each client, making it suitable for a wide variety of network topologies (such as full-mesh, bridge-based, or a hybrid of the two).
摘要翻译：从本地和远程客户端收集元数据的分散计算机网络架构和方法，并且基于该元数据在本地做出是否通过网络发送分组的决定。每个客户端监听其他客户端正在执行的操作，只有当并发扬声器的总数低于某个阈值时才发送。在多方语音会议实施例中，阈值是限制在小于一定数量的并发扬声器的数量。在分散式计算机网络架构下，用于连接客户端的网络拓扑的类型是灵活的，只要每个客户端都运行一个对等体感知系统来本地确定是否发送它们的数据包。分布式计算机网络架构和方法分布在每个客户端上运行，使其适用于各种网络拓扑（如全网状，基于桥接或两者混合）。

35. 发明授权

US07224847B2 System and method for real-time whiteboard streaming 有权
标题翻译：用于实时白板流的系统和方法
公开(公告)号：US07224847B2
公开(公告)日：2007-05-29
申请号：US10463068
申请日：2003-06-17
申请人： Zhengyou Zhang , Li-wei He
发明人： Zhengyou Zhang , Li-wei He
IPC分类号： G06K9/40
CPC分类号： H04L65/4046 , H04L29/06027 , H04L67/38 , H04N7/15
摘要： A system and method for streaming whiteboard content to computing devices in a networked environment. The invention is an extension of whiteboard image generation technology to provide network-based collaboration of a target meeting. In one aspect, each networked client can receive audio content and whiteboard content (video images). In another aspect, each networked client can transmit audio content and annotation content which is displayed separately or generated on the whiteboard image. The streaming content is built on external collaboration frameworks.
摘要翻译：一种用于将白板内容传送到网络环境中的计算设备的系统和方法。本发明是白板图像生成技术的扩展，以提供目标会议的基于网络的协作。在一个方面，每个联网的客户端可以接收音频内容和白板内容（视频图像）。在另一方面，每个联网的客户端可以发送单独显示或在白板图像上生成的音频内容和注释内容。流媒体内容基于外部协作框架。

36. 发明授权

US08085302B2 Combined digital and mechanical tracking of a person or object using a single video camera 有权
标题翻译：使用单个摄像机对人物或物体的组合数字和机械跟踪
公开(公告)号：US08085302B2
公开(公告)日：2011-12-27
申请号：US11284496
申请日：2005-11-21
申请人： Cha Zhang , Li-wei He , Yong Rui
发明人： Cha Zhang , Li-wei He , Yong Rui
IPC分类号： H04N5/225
CPC分类号： H04N7/185 , G08B13/19667 , H04N7/188
摘要： A combined digital and mechanical tracking system and process for generating a video using a single digital video camera that tracks a person or object of interest moving in a scene is presented. This generally involves operating the camera at a higher resolution than is needed for the application, and cropping a sub-region out of the image captured that is output as the output video. The person or object being tracked is at least partially contained within the cropped sub-region. As the person or object moves within the field of view of the camera, the location of the cropped sub-region is also moved so as to keep the subject of interest within its boundaries. When the subject of interest moves to the boundary of the FOV of the camera, the camera is mechanically panned to keep the person or object inside its FOV.
摘要翻译：呈现了组合的数字和机械跟踪系统和用于使用跟踪在场景中移动的感兴趣的对象的单个数字摄像机生成视频的过程。这通常涉及以比应用所需要的更高的分辨率来操作相机，以及从作为输出视频输出的捕获的图像中剪切一个子区域。被跟踪的人或物体至少部分地包含在裁剪的子区域内。随着人或物体在照相机的视场内移动，裁剪的子区域的位置也被移动，以将感兴趣的对象保持在其边界内。当感兴趣的主题移动到相机的FOV的边界时，相机被机械地平移以将人或物体保持在其FOV内。

37. 发明申请

US20100121841A1 AUTOMATIC DIAGNOSIS OF SEARCH RELEVANCE FAILURES 有权
标题翻译：搜索相关失败的自动诊断
公开(公告)号：US20100121841A1
公开(公告)日：2010-05-13
申请号：US12270201
申请日：2008-11-13
申请人： Li-wei He , Wenzhao Tan , Jinliang Fan , Yi-Min Wang , Xiaoxin Yin
发明人： Li-wei He , Wenzhao Tan , Jinliang Fan , Yi-Min Wang , Xiaoxin Yin
IPC分类号： G06F7/10 , G06F17/30 , G06N5/02
CPC分类号： G06F17/30867
摘要： Search relevance failures are diagnosed automatically. Users presented with unsatisfactory search results can report their dissatisfaction through various mechanisms. Dissatisfaction reports can trigger automatic investigation into the root cause of such dissatisfaction. Based on the identified root cause, a search engine can be modified to resolve the issue creating dissatisfaction thereby improving search engine quality.
摘要翻译：搜索相关性故障自动诊断。用户不满意的搜索结果可以通过各种机制报告他们的不满。不满意的报告可能引发自动调查，造成这种不满的根本原因。基于确定的根本原因，可以修改搜索引擎来解决创建不满意的问题，从而提高搜索引擎的质量。

38. 发明申请

US20080310328A1 CLIENT-SIDE ECHO CANCELLATION FOR MULTI-PARTY AUDIO CONFERENCING 有权
标题翻译：多方声音会议的客户端ECHO取消
公开(公告)号：US20080310328A1
公开(公告)日：2008-12-18
申请号：US11763224
申请日：2007-06-14
申请人： Junlin Li , Li-wei He , Dinei Florencio
发明人： Junlin Li , Li-wei He , Dinei Florencio
IPC分类号： H04L12/16 , H03B29/00 , H04Q11/00
CPC分类号： H04L12/16
摘要： A “Client-Side Echo Canceller” provides a unique system and method for reducing Multipoint Control Unit (MCU) computational overhead in a multi-point audio conference. In general, the local audio input signal of each client is transmitted in real-time to the MCU. The MCU then combines the audio input signals of all clients to create a single composite signal that is transmitted back to all clients in real-time. Each client then locally processes the composite signal to remove each client's local contribution to the composite signal prior to local playback in order to eliminate a local echo of each client's local audio input. In various embodiments, local cancellation of the local audio input from the composite signal is performed on either a time domain or a transform domain representation of the composite signal. Further, since each client receives the same signal, MCU transmission bandwidth can be reduced via multicast transmissions.
摘要翻译： “客户端回声消除器”提供了一种用于在多点音频会议中减少多点控制单元（MCU）计算开销的独特系统和方法。通常，每个客户端的本地音频输入信号实时传输到MCU。然后，MCU组合所有客户端的音频输入信号，以创建单个复合信号，并将其实时传输回所有客户端。然后，每个客户端本地处理复合信号以在本地回放之前去除每个客户端对复合信号的局部贡献，以便消除每个客户端的本地音频输入的本地回波。在各种实施例中，在复合信号的时域或变换域表示上执行来自复合信号的本地音频输入的局部消除。此外，由于每个客户端接收到相同的信号，所以可以通过多播传输来减少MCU传输带宽。

39. 发明申请

US20070286520A1 BACKGROUND BLURRING FOR VIDEO CONFERENCING 有权
标题翻译：背景影像视频会议
公开(公告)号：US20070286520A1
公开(公告)日：2007-12-13
申请号：US11422693
申请日：2006-06-07
申请人： Cha Zhang , Li-wei He , Yong Rui
发明人： Cha Zhang , Li-wei He , Yong Rui
IPC分类号： G06K9/40 , G06K9/34
CPC分类号： G06K9/00228 , H04N7/147
摘要： Background blurring is an effective way to both preserve privacy and keep communication effective during video conferencing. The present image background blurring technique is a light weight real-time technique to perform background blurring using a fast background modeling procedure combined with an object (e.g., face) detector/tracker. A soft decision is made at each pixel whether it belongs to the foreground or the background based on multiple vision features. The classification results are mapped to a per-pixel blurring radius image to blur the background. In another embodiment, the image background blurring technique blurs the background of the image without using the object detector.
摘要翻译：背景模糊是在视频会议中保持隐私和保持通信有效的有效方式。目前的图像背景模糊技术是使用与对象（例如脸部）检测器/跟踪器组合的快速背景建模过程来执行背景模糊的轻量级实时技术。基于多个视觉特征，在每个像素上做出软判决是否属于前景或背景。分类结果映射到每像素模糊半径图像以模糊背景。在另一个实施例中，图像背景模糊技术在不使用对象检测器的情况下模糊图像的背景。

40. 发明申请

US20070237099A1 DECENTRALIZED ARCHITECTURE AND PROTOCOL FOR VOICE CONFERENCING 有权
标题翻译：分散式架构和语音会议协议
公开(公告)号：US20070237099A1
公开(公告)日：2007-10-11
申请号：US11277905
申请日：2006-03-29
申请人： Li-wei He , Dinei Florencio , Yong Rui
发明人： Li-wei He , Dinei Florencio , Yong Rui
IPC分类号： H04L12/16
CPC分类号： H04L12/1822 , H04L67/104 , H04L67/1061
摘要： A decentralized computer network architecture and method that gathers metadata from local and remote clients and, based on that metadata, locally makes a decision whether to send a packet over the network. Each client listens to what other clients are doing, and only sends when the total number of concurrent speakers is below some threshold. In a multi-party voice conferencing embodiment, the threshold is a number of concurrent speakers that is restricted to less than a certain number. Under the decentralized computer network architecture, the type of network topology used to connect the clients is flexible, as long as each client is running a peer-aware system to decide locally whether to send their packets. The decentralized computer network architecture and method is distributed to run on each client, making it suitable for a wide variety of network topologies (such as full-mesh, bridge-based, or a hybrid of the two).
摘要翻译：从本地和远程客户端收集元数据的分散计算机网络架构和方法，并且基于该元数据在本地做出是否通过网络发送分组的决定。每个客户端监听其他客户端正在执行的操作，只有当并发扬声器的总数低于某个阈值时才发送。在多方语音会议实施例中，阈值是限制在小于一定数量的并发扬声器的数量。在分散式计算机网络架构下，用于连接客户端的网络拓扑的类型是灵活的，只要每个客户端都运行一个对等体感知系统来本地确定是否发送它们的数据包。分布式计算机网络架构和方法分布在每个客户端上运行，使其适用于各种网络拓扑（如全网状，基于桥接或两者混合）。

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