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    Media signal filtering for use in digital watermark reading
    13.
    发明授权
    Media signal filtering for use in digital watermark reading 有权
    用于数字水印读取的媒体信号滤波

    公开(公告)号：US07076082B2

    公开(公告)日：2006-07-11

    申请号：US10299244

    申请日：2002-11-18

    申请人： Ravi K. Sharma

    发明人： Ravi K. Sharma

    IPC分类号： H04K1/00

    CPC分类号： G10L21/00 ,  G06T1/0064 ,  G06T2201/0052 ,  G10L19/018 ,  H04N1/32144 ,  H04N1/32154 ,  H04N1/32352

    摘要： A curve fitting method is used to synchronize a reader of embedded data in a media signal. A circular reference signal is embedded in the media signal. After geometric distortion of the media signal, the reference signal is distorted, yet still detectable. The amount of distortion is derived by detecting the reference signal, and applying a curve fitting method from which the distortion is calculated.

    摘要翻译： 曲线拟合方法用于使媒体信号中嵌入数据的读取器同步。 循环参考信号嵌入在媒体信号中。 介质信号几何失真后，参考信号失真，仍然可以检测到。 通过检测参考信号导出失真量，并应用从中计算失真的曲线拟合方法。

    Encoded reference signal for digital watermarks
    14.
    发明授权
    Encoded reference signal for digital watermarks 有权

    公开(公告)号：US07046819B2

    公开(公告)日：2006-05-16

    申请号：US10132060

    申请日：2002-04-24

    申请人： Ravi K. Sharma ,  John Stach

    发明人： Ravi K. Sharma ,  John Stach

    IPC分类号： G06K9/00

    CPC分类号： G06T1/0064 ,  G06T2201/0052

    摘要： This disclosure describes a method for encoding a digital watermark into an image signal that is robust to geometric distortion. The digital watermark is adapted to the host image signal in which it is embedded so as to be imperceptible or substantially imperceptible in the watermarked image when displayed or printed. This digital watermark may be used to determine the geometric distortion applied to a watermarked image, may be used to carry auxiliary information, and may be used to detect and decode a digital watermark embedded in a geometrically distorted version of a watermarked image. Because of its robustness to geometric distortion, the digital watermark is useful for a number of applications for embedding auxiliary data in image signals, including still pictures and video, where the image signal is expected to survive geometric distortion.This method may adapted to other types of media signals such as audio.

    Method and apparatus for increasing video frame rate
    15.
    发明授权
    Method and apparatus for increasing video frame rate 失效
    提高视频帧速率的方法和装置

    公开(公告)号：US06192079B1

    公开(公告)日：2001-02-20

    申请号：US09074556

    申请日：1998-05-07

    申请人： Ravi K. Sharma ,  Rajeeb Hazra ,  Arlene Kasai

    发明人： Ravi K. Sharma ,  Rajeeb Hazra ,  Arlene Kasai

    IPC分类号： H04B166

    CPC分类号： H04N19/587

    摘要： Synthesizing of video frames that have been dropped by a video encoder is achieved by interpolating between decoded frames at a decoder. The method consists of successive refinement stages that increase in computational complexity. Starting with a spatio-temporal median filtering approach, each stage uses information that improves the quality of the interpolated frames, such as bit stream motion information, decoder-based motion estimation and motion-based state segmentation of regions. By using more computational resources, each of these stages results in an improved quality of interpolated video. The motion compensation techniques are based on block-based motion estimation of the kind used by block-transform based video encoders. More accurate motion estimates are obtained by using a combination of forward and backward block motion estimation. The method is further extended by incorporating global/local motion estimation based on the segmentation information, and employing image warping techniques to compensate for motion resulting from deformations.

    摘要翻译： 由视频编码器丢弃的视频帧的合成通过在解码器处的解码帧之间进行内插来实现。 该方法由连续的细化阶段组成，增加了计算复杂度。 从时空中值滤波方法开始，每个阶段使用提高内插帧质量的信息，例如位流运动信息，基于解码器的运动估计和区域的基于运动的状态分割。 通过使用更多的计算资源，这些阶段中的每一个都导致内插视频的改进质量。 运动补偿技术基于基于块变换的视频编码器使用的类型的基于块的运动估计。 通过使用正向和反向块运动估计的组合来获得更准确的运动估计。 通过结合基于分割信息的全局/局部运动估计，并采用图像扭曲技术来补偿由变形产生的运动，进一步扩展了该方法。

    Steganographic encoding and decoding
    16.
    发明授权
    Steganographic encoding and decoding 有权
    隐写编码和解码

    公开(公告)号：US08515120B2

    公开(公告)日：2013-08-20

    申请号：US12708278

    申请日：2010-02-18

    申请人： Alastair M. Reed ,  Ravi K. Sharma ,  Tony F. Rodriguez

    发明人： Alastair M. Reed ,  Ravi K. Sharma ,  Tony F. Rodriguez

    IPC分类号： G06K9/00

    CPC分类号： G06T1/005 ,  G06T1/0021 ,  G06T11/001 ,  G06T2201/0083 ,  H04N1/32144 ,  H04N1/32267 ,  H04N1/32309 ,  H04N1/6005 ,  H04N1/6008 ,  H04N2201/3228 ,  H04N2201/3233 ,  H04N2201/327

    摘要： This patent document relates generally to steganography and digital watermarking. One claim recites, in a watermark detector, a method of decoding auxiliary information encoded encoding in an image or video. The method includes: receiving data representing the image or video, wherein the data comprises first data corresponding to a first color channel, second data corresponding to a second color channel and third data corresponding to a third color channel; weighting the first data, the second data and the third data according to at least the following two factors: i) a color direction biased toward an anticipated embedding direction; and ii) anticipated image or video distortion introduced to the first data, second data or third data through scanning or signal processing; and determining from weighted first data, weighted second data and weighted third data, changes in an image or video attribute, in which the auxiliary information is conveyed through the changes to sample values representing the image or video. Of course, other claims and combinations are provided too.

    摘要翻译： 该专利文献一般涉及隐写术和数字水印。 一个要素在水印检测器中叙述了在图像或视频中解码辅助信息编码编码的方法。 该方法包括：接收表示图像或视频的数据，其中数据包括对应于第一颜色通道的第一数据，对应于第二颜色通道的第二数据和对应于第三颜色通道的第三数据; 至少根据以下两个因素对第一数据，第二数据和第三数据进行加权：i）偏向预期嵌入方向的颜色方向; 和ii）通过扫描或信号处理引入到第一数据，第二数据或第三数据的预期图像或视频失真; 并且从加权的第一数据，加权的第二数据和加权的第三数据确定图像或视频属性中的变化，其中辅助信息通过对表示图像或视频的采样值的改变而被传送。 当然，也提供其他权利要求和组合。

    Watermark synchronization signals conveying payload data
    17.
    发明授权
    Watermark synchronization signals conveying payload data 有权
    水印同步信号传送有效载荷数据

    公开(公告)号：US08301453B2

    公开(公告)日：2012-10-30

    申请号：US12692451

    申请日：2010-01-22

    申请人： Ravi K. Sharma

    发明人： Ravi K. Sharma

    IPC分类号： G10L21/00 ,  H04K1/00

    CPC分类号： G06T1/0071 ,  G06T1/0064 ,  G06T2201/0052

    摘要： Steganographic synchronization signals (sometimes termed “orientation signals,” “marker signals,” reference signals,” “grid signals,” “calibration signals,” etc.) are sometimes included with digital watermarking signals to aid in correct decoding of the object thereby marked (e.g., a digital image file, audio clip, document, etc.). Digital watermark detection systems sometimes fail if the object encompasses several separately-watermarked components (e.g., a scanned magazine page with several different images, or photocopy data resulting from scanning while several documents are on the photocopier platen). Each component may include its own synchronization signal, confusing the detection system. In accordance with certain embodiments, this problem is addressed by a proximity-based approach, and/or a multiple grid-based approach. In accordance with other embodiments, the synchronization signal can—itself—convey watermark information, so it serves both a synchronization and a payload-conveyance function.

    摘要翻译： 隐写同步信号（有时称为定向信号，标记信号，参考信号，电网信号，校准信号等）有时包含在数字水印信号中，以帮助正确解码由此标记的对象（例如，数字图像文件，音频 剪辑，文档等）。 如果对象包含几个单独加水印的组件（例如，具有多个不同图像的扫描的杂志页面，或者由多个文档位于复印机台上的扫描而产生的复印数据），则数字水印检测系统有时会失败。 每个组件可以包括其自己的同步信号，使得检测系统变得混乱。 根据某些实施例，该问题通过基于邻近的方法和/或多个基于网格的方法来解决。 根据其他实施例，同步信号可以自身传送水印信息，因此它同时用于同步和有效载荷传送功能。

    Histogram Methods and Systems for Object Recognition
    20.
    发明申请
    Histogram Methods and Systems for Object Recognition 有权
    直方图方法和对象识别系统

    公开(公告)号：US20120070078A1

    公开(公告)日：2012-03-22

    申请号：US13213963

    申请日：2011-08-19

    申请人： Ravi K. Sharma

    发明人： Ravi K. Sharma

    IPC分类号： G06K9/00

    CPC分类号： G06K9/4642 ,  G06F17/30256 ,  G06K9/38 ,  G06K9/4652 ,  G06K9/6201 ,  G06K9/6212 ,  G06T7/11 ,  H04M2250/52

    摘要： A multidimensional histogram is used to characterize an image (or object), and is used to identify candidate matches with one or more reference images (or objects). An exemplary implementation employs hue information for two of the dimensions, and a second derivative function based on luminance for a third dimension. The simplicity and speed of the detailed arrangements make them well suited for use with cell phones and other mobile devices, which can use the technology for image/object recognition, e.g., in visual search applications.

    摘要翻译： 多维直方图用于表征图像（或对象），并用于识别与一个或多个参考图像（或对象）的候选匹配。 示例性实施方案使用两个维度的色调信息，以及基于第三维度的亮度的二阶导数函数。 详细布置的简单性和速度使得它们非常适用于可以使用用于图像/对象识别的技术的手机和其他移动设备，例如在视觉搜索应用中。