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    Robust codebooks for vector quantization
    3.
    发明授权
    Robust codebooks for vector quantization 有权
    用于矢量量化的强大码本

    公开(公告)号：US06807312B2

    公开(公告)日：2004-10-19

    申请号：US09905565

    申请日：2001-07-13

    Applicant: Renjit Tom Thomas ,  Shawmin Lei

    Inventor： Renjit Tom Thomas ,  Shawmin Lei

    IPC: G06K946

    CPC classification number: G06K9/6255 ,  G06T9/008

    Abstract: A method for data compression. An encoder receives data vectors from an original data set. The encoder uses a vector quantization codebook to encode the data vectors into encoded vectors. The codebook is constructed from a compound data set, where the compound data set includes real data vectors and artificial data vectors. The encoded vectors are indexed in the codebook and the indexes are transmitted across communication channels or transmitted to storage.

    Abstract translation: 一种数据压缩方法。 编码器从原始数据集接收数据矢量。 编码器使用矢量量化码本将数据矢量编码为编码矢量。 码本由复合数据集构成，其中复合数据集包括实数据向量和人工数据向量。 编码矢量在码本中进行索引，并且索引通过通信信道传输或发送到存储器。

    System and method for low-delay channel hopping
    8.
    发明申请
    System and method for low-delay channel hopping 审中-公开
    低延迟信道跳频的系统和方法

    公开(公告)号：US20050229221A1

    公开(公告)日：2005-10-13

    申请号：US10818335

    申请日：2004-04-05

    Applicant: Louis Kerofsky ,  Shawmin Lei

    Inventor： Louis Kerofsky ,  Shawmin Lei

    IPC: H04N5/00 ,  H04N7/16 ,  H04N7/173

    CPC classification number: H04N21/42607 ,  H04N21/4331 ,  H04N21/4385 ,  H04N21/44222

    Abstract: A system and method are provided for low-delay channel changes in a multicast/broadcast of compressed video. The method comprises: receiving a multicast/broadcast with a plurality of compressed video channels; buffering information from a plurality of channels; selecting a channel; and, decoding the selected channel in response to the buffered information. In some aspects, the method pre-identifies access points in the buffered information for each channel, prior to selecting the channel. Then, decoding the selected channel in response to the buffered information includes: accessing the buffered information at the pre-identified access point; and, decoding the selected channel, beginning at the access point. Alternately, access points are not pre-identified. Then, decoding the selected channel in response to the buffered information includes: discovering an access point in the information buffered for the selected channel subsequent to selecting the channel; and, decoding the selected channel, beginning at the discovered access point.

    Abstract translation: 提供了一种用于在压缩视频的多播/广播中的低延迟信道改变的系统和方法。 该方法包括：接收具有多个压缩视频信道的组播/广播; 从多个频道缓冲信息; 选择一个频道; 以及响应于所缓冲的信息来解码所选择的信道。 在某些方面，在选择信道之前，该方法预先标识每个信道的缓冲信息中的接入点。 然后，响应于所缓冲的信息解码所选择的信道包括：访问预先识别的接入点处的缓冲信息; 并且从接入点开始对所选频道进行解码。 或者，接入点不是预先识别的。 然后，响应于所缓冲的信息对所选择的信道进行解码，包括：在选择信道之后，发现为所选择的信道缓冲的信息中的接入点; 并从所发现的接入点开始对所选频道进行解码。

    Digital watermarking in a perceptually uniform domain
    9.
    发明授权
    Digital watermarking in a perceptually uniform domain 有权
    数字水印在感知统一的领域

    公开(公告)号：US06792129B1

    公开(公告)日：2004-09-14

    申请号：US09645105

    申请日：2000-08-23

    Applicant: Wenjun Zeng ,  Shawmin Lei

    Inventor： Wenjun Zeng ,  Shawmin Lei

    IPC: G06K900

    CPC classification number: G06T1/0028 ,  G06T2201/0052 ,  G06T2201/0202

    Abstract: Methods and apparatus for watermarking a digital media object, and for detecting watermarks, are presented. The basic concept underlying the disclosed approach is watermarking/detection in a transform space that allows the same level of watermarking to be applied to all samples. For instance, in one embodiment, a watermarking system first nonlinearly transforms the original signal to a perceptually uniform domain, and then embeds the watermark in this domain without varying the statistical properties of the watermark at each sample. At the watermark detector, a candidate image is transformed to the same perceptually uniform domain, and then correlated with the original watermark sequence. Under such conditions, it is shown that an optimal watermark detector can be derived. This approach is particularly attractive when the original image is unavailable at the detector, as it effectively prevents the image content from biasing the watermark detection score.

    Abstract translation: 提出了用于对数字媒体对象进行水印处理和检测水印的方法和装置。 所公开方法的基本概念是在允许将相同水平的水印应用于所有样本的变换空间中进行水印/检测。 例如，在一个实施例中，水印系统首先将原始信号非线性地变换成感知统一的域，然后将水印嵌入该域中而不改变每个样本处的水印的统计特性。 在水印检测器处，将候选图像转换为相同的感知统一域，然后与原始水印序列相关。 在这种条件下，可以得出最佳水印检测器。 当原始图像在检测器处不可用时，这种方法特别有吸引力，因为它有效地防止图像内容偏置水印检测分数。

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