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    • 53. 发明授权
    • High dynamic range data format conversions for digital media
    • 数字媒体的高动态范围数据格式转换
    • US08880571B2
    • 2014-11-04
    • US11418627
    • 2006-05-05
    • Sridhar SrinivasanZhi Zhou
    • Sridhar SrinivasanZhi Zhou
    • G06F7/00G06F15/00H04N1/60H03M7/24H04N1/407
    • H03M7/24H04N1/407H04N1/6027
    • One or more continuous mappings are defined at a digital media encoder to convert input digital media data in a first high dynamic range format to a second format with a smaller dynamic range than the first format. The encoder converts the input digital media data to the second format with the smaller dynamic range using the continuous mapping and one or more conversion parameters relating to the continuous mapping. The encoder encodes the converted digital media data in a bitstream along with the conversion parameter(s). The conversion parameter(s) enable a digital media decoder to convert the converted digital media data back to the first high dynamic range format from the second format with the smaller dynamic range. Techniques for converting different input formats with different dynamic ranges are described.
    • 在数字媒体编码器处定义一个或多个连续映射,以将第一高动态范围格式的输入数字媒体数据转换成具有比第一格式更小的动态范围的第二格式。 编码器使用连续映射和与连续映射相关的一个或多个转换参数将输入数字媒体数据转换为具有较小动态范围的第二格式。 编码器将转换的数字媒体数据与转换参数一起编码在比特流中。 转换参数使得数字媒体解码器能够将转换的数字媒体数据从具有较小动态范围的第二格式转换回第一高动态范围格式。 描述用于转换具有不同动态范围的不同输入格式的技术。
    • 54. 发明授权
    • System and method for non-cooperative iris image acquisition
    • 非合作虹膜图像采集系统和方法
    • US08644565B2
    • 2014-02-04
    • US13055250
    • 2009-07-22
    • Eliza Yingzi DuZhi ZhouEmrah Arslanturk
    • Eliza Yingzi DuZhi ZhouEmrah Arslanturk
    • G06K9/00
    • G06K9/00604
    • A method segments iris images from eye image data captured from non-cooperative subjects. The method includes receiving a frame of eye image data, and determining whether a pupil exists in the image by detecting glare areas in the image. Upon finding a pupil, subsequent images are processed with reference to the pupil location and a radius is calculated for the pupil. A k means clustering method and principal component analysis are used to locate pupil boundary points, which are fitted to a conic. Using the pupil boundary, an angular derivative is computed for each frame having a pupil and iris boundary points are fitted to a conic to identify an iris region between the iris boundary and the pupil boundary. Noise data are then removed from the iris region to generate an iris segment. A method for evaluating iris frame quality and iris image segmentation quality is also disclosed.
    • 一种方法从非合作对象捕获的眼图数据中分割虹膜图像。 该方法包括接收一帧眼图数据,并通过检测图像中的眩光区域来确定图像中是否存在瞳孔。 在找到瞳孔时,参考瞳孔位置处理随后的图像,并计算瞳孔的半径。 A k表示聚类方法,主成分分析用于定位适合于锥体的瞳孔边界点。 使用瞳孔边界,对于具有瞳孔的每个帧计算角度导数,并且将虹膜边界点拟合到圆锥,以识别虹膜边界和瞳孔边界之间的虹膜区域。 然后从虹膜区域移除噪声数据,以产生虹膜段。 还公开了一种用于评估虹膜框架质量和虹膜图像分割质量的方法。
    • 55. 发明授权
    • Small detail reservation in content-adaptive quantization
    • 内容自适应量化中的小细节预留
    • US08295346B2
    • 2012-10-23
    • US12420763
    • 2009-04-08
    • Zhi ZhouYeongtaeg Kim
    • Zhi ZhouYeongtaeg Kim
    • H04N7/12H04N11/02H04N11/04G06K9/36G06K9/00H03M7/00
    • H04N19/186H04N19/124H04N19/14H04N19/176H04N19/61
    • Video processing systems and methods for preservation of small details in video undergoing quantization is discussed. Small details are preserved by identifying an area of interest within a video frame, determining whether small details are present within the selected portion of the video frame, and further determining whether those small details may be lost during quantization. In the event that small details are present in the selected portion of the video frame and may be lost during quantization, a color-shifting operation may be performed on one or more color components of the selected portion of the video frame, such as luminance, prior to quantization to preserve the small detail. During the color-shifting operation, the values of at least one color component of pixels representing the video frame are shifted such that the pixels extend between at least two quantization levels when quantized. In this manner, small detail is preserved, while also allowing for a reduction in the total bits of information contained in the video frame.
    • 讨论了视频处理系统和用于保存正在进行量化的视频中的小细节的方法。 通过识别视频帧内的感兴趣区域来确定小细节,确定视频帧的所选部分内是否存在小细节,并且进一步确定在量化期间这些小细节是否可能丢失。 在视频帧的所选部分中存在小细节并且可能在量化期间丢失的情况下,可以对视频帧的所选部分的一个或多个颜色分量执行色彩转换操作,诸如亮度, 在量化之前保存小细节。 在色彩变换操作期间,表示视频帧的像素的至少一个颜色分量的值被移位,使得像素在量化时在至少两个量化级之间延伸。 以这种方式,保留了细节,同时还允许减少包含在视频帧中的信息的总比特。
    • 58. 发明申请
    • Technique and apparatus to determine an initial reactant stoichiometric ratio for a fuel cell system
    • 确定燃料电池系统的初始反应物化学计量比的技术和装置
    • US20080152965A1
    • 2008-06-26
    • US11645240
    • 2006-12-22
    • Jing OuZhi ZhouJohn W. ParksDustan L. Skidmore
    • Jing OuZhi ZhouJohn W. ParksDustan L. Skidmore
    • H01M8/04H01M8/02
    • H01M8/04201H01M8/04089H01M8/0432H01M8/04552H01M8/04619H01M8/04626H01M8/04708H01M8/04753H01M8/0618
    • A technique that is usable with a fuel cell system that provides power to a load and is directed toward learning an optimal reactant stoichiometric ratio(s) for starting up the fuel cell system. In accordance with the technique, data representative of a plurality of reactant flows, each of which corresponds to an output power level provided by a fuel cell stack is stored in a memory. Upon startup of the system, a particular reactant flow is provided to the fuel cell stack based on the stored data. A new reactant flow that corresponds to current output power level being provided by the fuel cell stack is learned by adjusting the reactant flow until the fuel cell system is operating at a desired performance level. The stored data is then adapted based on the learned new reactant flow and the adapted data replaces the data that was previously stored in the memory. In this manner, a more exact starting reactant stoichiometric ratio(s) may be determined while the fuel cell system is in operation. This learned reactant stoichiometric ratio may then be used the next time the fuel cell system is powered up, thus, increasing the operating efficiency of the fuel cell system.
    • 一种可用于向负载提供电力并且用于学习用于启动燃料电池系统的最佳反应物化学计量比的燃料电池系统的技术。 根据该技术,代表多个反应物流的数据被存储在存储器中,每个反应物流量对应于由燃料电池堆提供的输出功率水平。 在系统启动时,基于存储的数据向燃料电池堆提供特定的反应物流。 通过调节反应物流直到燃料电池系统以期望的性能水平运行,获得对应于由燃料电池堆提供的电流输出功率水平的新的反应物流。 然后基于所学习的新反应物流来适应所存储的数据,并且所适配的数据替换先前存储在存储器中的数据。 以这种方式,可以在燃料电池系统运行时确定更准确的起始反应物化学计量比。 然后可以在下一次燃料电池系统通电时使用所了解的反应物化学计量比,从而提高燃料电池系统的运行效率。
    • 59. 发明授权
    • Rate control with picture-based lookahead window
    • 速率控制与基于图片的lookahead窗口
    • US07099389B1
    • 2006-08-29
    • US10316483
    • 2002-12-10
    • Guoyao YuZhi ZhouCharles H. Van Dusen
    • Guoyao YuZhi ZhouCharles H. Van Dusen
    • H04N7/12H04N11/02
    • H04N19/115H04N19/117H04N19/124H04N19/152H04N19/172H04N19/177H04N19/40H04N19/61H04N19/80H04N19/85
    • A method of rate control using a picture-based lookahead sliding window in a dual-pass transcoder/encoder compressed video architecture extracts statistics from an input video signal according to a simple compression standard, the input video signal being a compressed video signal for transcoding or an uncompressed video signal for encoding. A trans-factor is calculated for a current picture based on previous pictures in a sliding window to predict the complexity of the current picture, the trans-factor being a ratio of global complexity measures for the simple compression standard versus a sophisticated compression standard. Bits for the current picture are then allocated based on the complexity of future pictures in the sliding window. After encoding the current picture according to the sophisticated compression standard, the target bits of and the picture complexity in the sliding window, as well as the trans-factor, are updated as the window is moved by one picture. The extraction of the statistics is achieved in a transcoder by using a simple compression standard decoder to produce the statistics from the compressed video signal as the input video signal, and in an encoder by using a simple compression encoder to generate the statistics from the uncompressed video signal as the input video signal.
    • 在双通道代码转换器/编码器压缩视频架构中使用基于图像的前瞻滑动窗口的速率控制方法根据简单的压缩标准从输入视频信号中提取统计信息,输入视频信号是用于代码转换的压缩视频信号, 用于编码的未压缩视频信号。 基于滑动窗口中的先前图像来计算当前图像的转换因子,以预测当前图像的复杂度,反向因子是简单压缩标准与复杂压缩标准的全局复杂度度量之比。 然后根据滑动窗口中未来图片的复杂度分配当前图片的位。 在根据复杂的压缩标准对当前图像进行编码之后,当窗口被一个图像移动时,更新滑动窗口中的目标位和图像复杂度以及变换因子。 通过使用简单的压缩标准解码器从压缩视频信号作为输入视频信号产生统计信息,并且在编码器中通过使用简单的压缩编码器来生成来自未压缩视频的统计信息,在代码转换器中实现统计的提取 信号作为输入视频信号。