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    • 41. 发明授权
    • System and process for broadcast and communication with very low bit-rate bi-level or sketch video
    • 具有非常低比特率双级或素描视频的广播和通信的系统和过程
    • US07916794B2
    • 2011-03-29
    • US10931769
    • 2004-08-31
    • Jiang LiHeung-Yeung ShumGang Chen
    • Jiang LiHeung-Yeung ShumGang Chen
    • H04N7/18
    • H04N19/156H04N19/13
    • A system and process for broadcast and communication with bi-level or sketch video at extremely low bandwidths is described. Essentially, bi-level and sketch video presents the outlines of the objects in a scene being depicted. Bi-level and sketch video provides a clearer shape, smoother motion, shorter initial latency and cheaper computational cost than do conventional DCT-based video compression methods. This is accomplished by converting each color or gray-scale image frame to bi-level or sketch image frame using adaptive thresholding method, compressing bi-level or sketch image frames into bi-level or sketch video using adaptive context-based arithmetic coding method. Bi-level or sketch video is particularly suitable to such small devices as Pocket PCs and mobile phones that possess small display screen, low bandwidth connection, and light computational power.
    • 描述了以非常低的带宽进行双级或草图视频的广播和通信的系统和过程。 本质上,双层和素描视频呈现了所描绘的场景中对象的轮廓。 与传统的基于DCT的视频压缩方法相比,双层和草图视频提供了更清晰的形状,更平滑的运动,更短的初始延迟和更便宜的计算成本。 这是通过使用自适应阈值方法将每个颜色或灰度级图像帧转换为双级或草图图像帧来实现的,使用自适应基于上下文的算术编码方法将双级或者草图图像帧压缩为双级或草图视频。 双级或草图视频特别适用于具有小显示屏,低带宽连接和轻量级计算能力的小型设备,如掌上电脑和手机。
    • 42. 发明授权
    • Color image coding using inter-color correlation
    • 彩色图像编码采用色间相关
    • US07903894B2
    • 2011-03-08
    • US11543576
    • 2006-10-05
    • Hua CaiJiang Li
    • Hua CaiJiang Li
    • G06K9/46
    • H04N19/182H04N19/13H04N19/136H04N19/186H04N19/593
    • Described is an image compression technology by which a coefficient representative of a chrominance component corresponding to an (x, y) coordinate pair is coded into a symbol, along with plurality of context events associated with that symbol, to facilitate more efficient context-based arithmetic coding. For example, four context events may be generated, including one context event based on the corresponding (x, y) coefficient value in the luminance component, and three context events based on other luminance coefficients that have adjacent horizontal, vertical and diagonal relationships with the corresponding luminance component's coefficient, respectively. In one example implementation, coding the chrominance coefficient and computing the plurality of context events occurs in a zero coding pass of an entropy coder. A sign coding pass and a magnitude refinement pass may be performed to obtain further symbols for the context-based arithmetic coding.
    • 描述了一种图像压缩技术,通过该技术,表示对应于(x,y)坐标对的色度分量的系数与多个与该符号相关联的上下文事件一起编码为符号,以促进更有效的基于上下文的算术 编码。 例如,可以生成四个上下文事件,包括基于亮度分量中的对应(x,y)系数值的一个上下文事件,以及基于与其相关的其他亮度系数的三个上下文事件,这些亮度系数与 分别对应亮度分量系数。 在一个示例实现中,对色度系数进行编码并计算多个上下文事件发生在熵编码器的零编码遍中。 可以执行符号编码遍和幅度细化遍以获得用于基于上下文的算术编码的另外的符号。
    • 47. 发明授权
    • Mechanism for controlling communication paths between conference members
    • 控制会议成员通信路径的机制
    • US07552175B2
    • 2009-06-23
    • US10837315
    • 2004-04-30
    • Chong LuoJiang LiShipeng Li
    • Chong LuoJiang LiShipeng Li
    • G06F15/16
    • H04L12/1822H04L12/1854H04L65/4046
    • The techniques and mechanisms described herein are directed to controlling communication paths between conference members in a decentralized multi-party conference that supports a full mesh architecture. Several check points are tested in order to handle concurrency issues and to ensure quality of service. First, a check is made to determine whether any pending communication paths exist between the two systems. Second, a check is made to determine whether one of the systems is in the process of leaving the multi-party conference. Third, a check is made to determine whether a maximum number of conference members already exist in the conference. Upon failing any of these checks, the communication path between the two systems fails. Upon success, the new system initiates the joining process with each of the other members in the conference in order to maintain the full mesh architecture.
    • 本文描述的技术和机制旨在控制支持全网状架构的分散式多方会议中的会议成员之间的通信路径。 测试了几个检查点,以处理并发问题并确保服务质量。 首先,检查两个系统之间是否存在任何挂起的通信路径。 第二,进行检查以确定其中一个系统是否正在离开多方会议。 第三,进行检查,以确定会议中是否已经存在最多会议成员。 在任何这些检查失败之后,两个系统之间的通信路径失败。 成功后,新系统将启动会议中每个其他成员的加入过程,以维护完整的网状结构。
    • 48. 发明授权
    • Video image quality
    • 视频图像质量
    • US07542600B2
    • 2009-06-02
    • US10970263
    • 2004-10-21
    • Keman YuJiang LiShipeng Li
    • Keman YuJiang LiShipeng Li
    • G06K9/00
    • H04N9/646G06T5/009G06T5/40G06T7/90G06T2207/30201
    • Video image quality may be improved by correcting exposure levels and/or enhancing contrast amounts on each frame. One or more of the following phases may be implemented: skin-color model building, face detecting, exposure level correcting, and contrast enhancing. In a described implementation, a Gaussian skin-color model is built for each image frame during runtime. The Gaussian skin-color model is built with training pixels that are selected responsive to a defined skin color range, which is created offline from manually-selected skin pixels of multiple test sequences. In another described implementation, each pixel of an image frame is re-exposed using a ratio of contrast amount control variables (CACVs). More specifically, a pixel may be converted to a corresponding light intensity using a first CACV, and the corresponding light intensity may be reconverted to a pixel using a second CACV to enhance the contrast and possibly reduce fuzziness of the image frame.
    • 可以通过校正曝光水平和/或增强每帧上的对比度量来改善视频图像质量。 可以实现以下阶段中的一个或多个:皮肤颜色模型构建,面部检测,曝光水平校正和对比度增强。 在描述的实现中,在运行时间期间为每个图像帧构建高斯肤色模型。 高斯肤色模型是用训练像素构建的,训练像素是响应于定义的皮肤颜色范围而选择的,这是由多个测试序列的手动选择的皮肤像素离线创建的。 在另一描述的实现中,使用对比度量控制变量(CACV)的比率来重新曝光图像帧的每个像素。 更具体地,可以使用第一CACV将像素转换为对应的光强度,并且可以使用第二CACV将对应的光强度重新转换为像素,以增强对比度并且可能降低图像帧的模糊性。