公开(公告)号：US20130188463A1

公开(公告)日：2013-07-25

申请号：US13745297

申请日：2013-01-18

Applicant: Yibin Ng ,  Vijayakumar Bhagavatula ,  Cai Kui

Inventor： Yibin Ng ,  Vijayakumar Bhagavatula ,  Cai Kui

IPC: G11B20/10

CPC classification number: G11B20/10398 ,  G11B20/10287 ,  G11B2220/2516

Abstract: A method performed by a disk drive, comprising: receiving a plurality of signal samples over a channel in the disk drive; executing a forward pattern-dependent noise prediction (PDNP) operation on the plurality of the signal samples; generating, based on execution of the forward PDNP operation, a first detection of recorded data bits in the plurality of received signal samples; executing a backward PDNP operation on the plurality of the received signal samples; generating, based on execution of the backward PDNP operation, a second detection of recorded data bits in the plurality of received signal samples; comparing the first detection to the second detection; identifying, based on comparing, one or more erasures in the received plurality of signal samples; and generating one or more sequences of bits that promote correction of the one or more erasures.

Abstract translation: 一种由磁盘驱动器执行的方法，包括：通过所述磁盘驱动器中的通道接收多个信号样本; 对所述多个所述信号样本执行正向模式相关噪声预测（PDNP）操作; 基于所述正向PDNP操作的执行，生成所述多个接收信号样本中的记录数据位的第一检测; 对所述多个接收信号样本执行反向PDNP操作; 基于所述后向PDNP操作的执行，生成所述多个接收信号样本中的记录数据位的第二检测; 将第一检测与第二检测进行比较; 基于比较识别所接收的多个信号样本中的一个或多个擦除; 以及生成促进所述一个或多个擦除的校正的一个或多个比特序列。

公开(公告)号：US08294794B2

公开(公告)日：2012-10-23

申请号：US12830525

申请日：2010-07-06

Applicant: Wende Zhang ,  Qi Wu ,  Vijayakumar Bhagavatula

Inventor： Wende Zhang ,  Qi Wu ,  Vijayakumar Bhagavatula

IPC: H04N9/64

CPC classification number: G06K9/00791 ,  G06K9/346 ,  G06T5/007 ,  G06T7/12 ,  G06T2207/10024 ,  G06T2207/30252

Abstract: A method for is provided for creating a shadow-reduced image from a captured image for distinguishing a clear path of travel. Each pixel of a captured input image is plotted according to a two dimensional logarithmic graph. A specific color set relating to an associated color value of a clear path. A linear illumination-invariant axis is determined as a function of the specific color set. An illumination direction for the linear illumination-invariant axis is determined. A log-chromaticity value of each plotted pixel of the specific color set is projected on the axis. Edges in the input image and the illumination-invariant image domain are identified. The identified edges of the input image are compared to identify edges in the illumination-invariant image domain. A determination is made whether a shadow edge is present in response to comparing the edges. A shadow-reduced image is generated for scene analysis by a vehicle vision-based system.

Abstract translation: 提供了一种用于从捕获的图像创建阴影缩小图像以区分清晰的行进路径的方法。 捕获的输入图像的每个像素根据二维对数图进行绘制。 与清晰路径相关联的颜色值相关的特定颜色集。 线性照明不变轴被确定为特定颜色集合的函数。 确定线性照明不变轴的照明方向。 特定颜色集合的每个绘制像素的对数色度值投影在轴上。 识别输入图像和照明不变图像域中的边缘。 将识别的输入图像的边缘进行比较，以识别照明不变图像域中的边缘。 确定响应于比较边缘是否存在阴影边缘。 通过基于车辆视觉的系统生成用于场景分析的阴影缩小图像。

公开(公告)号：US07058873B2

公开(公告)日：2006-06-06

申请号：US10289780

申请日：2002-11-07

Applicant: Hongwei Song ,  Vijayakumar Bhagavatula ,  Jingfeng Liu

Inventor： Hongwei Song ,  Vijayakumar Bhagavatula ,  Jingfeng Liu

IPC: H03M13/11 ,  H03M13/29 ,  H03M13/45

CPC classification number: H03M13/1111 ,  H03M13/116 ,  H03M13/1515 ,  H03M13/2906 ,  H04L1/0041 ,  H04L1/005 ,  H04L1/0057 ,  H04L1/0065

Abstract: A method for communicating binary data and a digital communication system are presented. According to one embodiment, the method includes encoding a message word by multiplying the message word with a generator matrix, wherein the generator matrix multiplied by the transpose of a parity check matrix for a low density parity check code yields a null set, and wherein the parity check matrix has a column weight of two. Additionally disclosed is an encoding scheme based on a three-tier Tanner graph having a girth of twelve.

Abstract translation: 提出了一种用于传送二进制数据和数字通信系统的方法。 根据一个实施例，该方法包括通过将消息字与生成器矩阵相乘来对消息字进行编码，其中生成器矩阵乘以用于低密度奇偶校验码的奇偶校验矩阵的转置产生空集合，并且其中， 奇偶校验矩阵的列权重为2。 另外公开的是一种基于三层Tanner图的编码方案，其长度为十二分。

公开(公告)号：US08711661B2

公开(公告)日：2014-04-29

申请号：US13745297

申请日：2013-01-18

Applicant: Yibin Ng ,  Vijayakumar Bhagavatula ,  Kui Cai

Inventor： Yibin Ng ,  Vijayakumar Bhagavatula ,  Kui Cai

IPC: G11B11/00

CPC classification number: G11B20/10398 ,  G11B20/10287 ,  G11B2220/2516

Abstract: A method performed by a disk drive, comprising: receiving a plurality of signal samples over a channel in the disk drive; executing a forward pattern-dependent noise prediction (PDNP) operation on the plurality of the signal samples; generating, based on execution of the forward PDNP operation, a first detection of recorded data bits in the plurality of received signal samples; executing a backward PDNP operation on the plurality of the received signal samples; generating, based on execution of the backward PDNP operation, a second detection of recorded data bits in the plurality of received signal samples; comparing the first detection to the second detection; identifying, based on comparing, one or more erasures in the received plurality of signal samples; and generating one or more sequences of bits that promote correction of the one or more erasures.

Abstract translation: 一种由磁盘驱动器执行的方法，包括：通过所述磁盘驱动器中的通道接收多个信号样本; 对所述多个所述信号样本执行正向模式相关噪声预测（PDNP）操作; 基于所述正向PDNP操作的执行，生成所述多个接收信号样本中的记录数据位的第一检测; 对所述多个接收信号样本执行反向PDNP操作; 基于所述后向PDNP操作的执行，生成所述多个接收信号样本中的记录数据位的第二检测; 将第一检测与第二检测进行比较; 基于比较识别所接收的多个信号样本中的一个或多个擦除; 以及生成促进所述一个或多个擦除的校正的一个或多个比特序列。

公开(公告)号：US20120008019A1

公开(公告)日：2012-01-12

申请号：US12830513

申请日：2010-07-06

Applicant: Wende Zhang ,  Qi Wu ,  Vijayakumar Bhagavatula

Inventor： Wende Zhang ,  Qi Wu ,  Vijayakumar Bhagavatula

IPC: H04N9/64

CPC classification number: G06K9/00791 ,  G06K9/346 ,  G06T5/008 ,  G06T7/90 ,  G06T2207/10024 ,  G06T2207/30252

Abstract: A method is provided for removing an illumination generated shadow in a captured image. Each pixel of the captured input image is plotted on a two dimensional logarithmic graph. A linear axis for the plurality of color sets is determined that is substantially orthogonal to a respective illumination direction of each respective color set. A log-chromaticity value of each plotted pixel is projected on the axis. An orientation of the linear axis is selected to minimize an illumination effect and provide optimum separation between each of the respective color sets on the linear axis. Edges in the input image and illumination invariant image domain are identified. The identified edges of the input image are compared to identify edges in the illumination invariant image domain. A determination is made whether a shadow edge is present in response to the comparison. A shadow-reduced image is generated for scene analysis by a vehicle vision-based system.

Abstract translation: 提供了一种用于去除拍摄图像中的照明产生阴影的方法。 捕获的输入图像的每个像素绘制在二维对数图上。 确定多个颜色组的线性轴，其基本上与每个相应颜色组的相应照明方向正交。 每个绘制像素的对数色度值投影在轴上。 选择线性轴的取向以最小化照明效果并且在线性轴上的每个相应颜色集之间提供最佳间隔。 识别输入图像和照明不变图像域中的边缘。 将识别的输入图像的边缘进行比较，以识别照明不变图像域中的边缘。 确定响应于比较是否存在阴影边缘。 通过基于车辆视觉的系统生成用于场景分析的阴影缩小图像。

公开(公告)号：US08345100B2

公开(公告)日：2013-01-01

申请号：US12830513

申请日：2010-07-06

Applicant: Wende Zhang ,  Qi Wu ,  Vijayakumar Bhagavatula

Inventor： Wende Zhang ,  Qi Wu ,  Vijayakumar Bhagavatula

IPC: H04N7/18 ,  G06K9/40

CPC classification number: G06K9/00791 ,  G06K9/346 ,  G06T5/008 ,  G06T7/90 ,  G06T2207/10024 ,  G06T2207/30252

Abstract: A method is provided for removing an illumination generated shadow in a captured image. Each pixel of the captured input image is plotted on a two dimensional logarithmic graph. A linear axis for the plurality of color sets is determined that is substantially orthogonal to a respective illumination direction of each respective color set. A log-chromaticity value of each plotted pixel is projected on the axis. An orientation of the linear axis is selected to minimize an illumination effect and provide optimum separation between each of the respective color sets on the linear axis. Edges in the input image and illumination invariant image domain are identified. The identified edges of the input image are compared to identify edges in the illumination invariant image domain. A determination is made whether a shadow edge is present in response to the comparison. A shadow-reduced image is generated for scene analysis by a vehicle vision-based system.

Abstract translation: 提供了一种用于去除拍摄图像中的照明产生阴影的方法。 捕获的输入图像的每个像素绘制在二维对数图上。 确定多个颜色组的线性轴，其基本上与每个相应颜色组的相应照明方向正交。 每个绘制像素的对数色度值投影在轴上。 选择线性轴的取向以最小化照明效果并且在线性轴上的每个相应颜色集之间提供最佳间隔。 识别输入图像和照明不变图像域中的边缘。 将识别的输入图像的边缘进行比较，以识别照明不变图像域中的边缘。 确定响应于比较是否存在阴影边缘。 通过基于车辆视觉的系统生成用于场景分析的阴影缩小图像。

公开(公告)号：US07948708B2

公开(公告)日：2011-05-24

申请号：US12408954

申请日：2009-03-23

Applicant: William C. Messner ,  Hiroyuki Suzuki ,  James A. Bain ,  Vijayakumar Bhagavatula ,  Sheida Nabavi

Inventor： William C. Messner ,  Hiroyuki Suzuki ,  James A. Bain ,  Vijayakumar Bhagavatula ,  Sheida Nabavi

IPC: G11B5/596 ,  G11B21/02

CPC classification number: G11B5/596 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/743 ,  G11B5/746 ,  G11B20/10009 ,  G11B2220/2516 ,  G11B2220/252

Abstract: An apparatus, system, and method comprise a magnetoresistive head configured to respond to magnetization states of patterned cells formed on a patterned medium. The magnetoresistive head detects the magnetization states of at least two patterned cells formed on a patterned medium. The magnetoresistive head generates a readback signal based on the magnetization state of the at least two patterned cells. A detector circuit coupled to the head determines a bit pattern corresponding to the readback signal. A processor circuit coupled to the detector circuit determines positional information associated with the magnetoresistive head relative to the at least two patterned cells based on the bit pattern. The system further comprises a patterned medium.

Abstract translation: 装置，系统和方法包括磁阻头，其被配置为响应形成在图案化介质上的图案化单元的磁化状态。 磁阻头检测形成在图案化介质上的至少两个图案化单元的磁化状态。 磁阻磁头基于至少两个图案化电池的磁化状态产生回读信号。 耦合到头部的检测器电路确定与回读信号相对应的位模式。 耦合到检测器电路的处理器电路基于位图案确定与磁阻头相对于至少两个图案化单元相关联的位置信息。 系统还包括图案化介质。

公开(公告)号：US08930800B2

公开(公告)日：2015-01-06

申请号：US13585656

申请日：2012-08-14

Applicant: Zheng Li ,  Fan Bai ,  Vijayakumar Bhagavatula

Inventor： Zheng Li ,  Fan Bai ,  Vijayakumar Bhagavatula

IPC: H03M13/00 ,  H03M13/23 ,  H04B7/08

CPC classification number: H03M13/23 ,  H03M13/09 ,  H03M13/3746 ,  H03M13/6337 ,  H04B7/0851 ,  H04L1/0045 ,  H04L1/1812

Abstract: A method for receiving and storing a packet of symbols. The method decodes the packet of symbols using a first decoding algorithm, and if the first decoding algorithm fails to correctly decode the packet of symbols, then the method decodes the packet of symbols using a second decoding algorithm. If the second decoding algorithm fails to decode the packet of symbols, then a third decoding algorithm is used. The third decoding algorithm can be sub-packet decoding, where a first sub-packet is part of the packet of symbols. If the first sub-packet is decoded successfully, then the method generates a channel estimate using the properly decoded information, and then uses that channel estimate to decode a subsequent sub-packet using the channel estimate, where the second sub-packet is a set of symbols that are a portion of the packet of symbols.

Abstract translation: 一种用于接收和存储符号分组的方法。 该方法使用第一解码算法解码符号分组，并且如果第一解码算法不能正确地解码符号分组，则该方法使用第二解码算法对符号分组进行解码。 如果第二解码算法无法解码符号分组，则使用第三解码算法。 第三解码算法可以是子分组解码，其中第一子分组是符号分组的一部分。 如果第一子分组被成功解码，则该方法使用正确解码的信息生成信道估计，然后使用该信道估计来使用信道估计来解码后续子分组，其中第二子分组是集合 作为符号分组的一部分的符号。

公开(公告)号：US20100238584A1

公开(公告)日：2010-09-23

申请号：US12408954

申请日：2009-03-23

Applicant: William C. Messner ,  Hiroyuki Suzuki ,  James A. Bain ,  Vijayakumar Bhagavatula ,  Sheida Nabavi

Inventor： William C. Messner ,  Hiroyuki Suzuki ,  James A. Bain ,  Vijayakumar Bhagavatula ,  Sheida Nabavi

IPC: G11B21/02 ,  G11B5/33

CPC classification number: G11B5/596 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/743 ,  G11B5/746 ,  G11B20/10009 ,  G11B2220/2516 ,  G11B2220/252

Abstract: An apparatus, system, and method comprise a magnetoresistive head configured to respond to magnetization states of patterned cells formed on a patterned medium. The magnetoresistive head detects the magnetization states of at least two patterned cells formed on a patterned medium. The magnetoresistive head generates a readback signal based on the magnetization state of the at least two patterned cells. A detector circuit coupled to the head determines a bit pattern corresponding to the readback signal. A processor circuit coupled to the detector circuit determines positional information associated with the magnetoresistive head relative to the at least two patterned cells based on the bit pattern. The system further comprises a patterned medium.

Abstract translation: 装置，系统和方法包括磁阻头，其被配置为响应形成在图案化介质上的图案化单元的磁化状态。 磁阻头检测形成在图案化介质上的至少两个图案化单元的磁化状态。 磁阻磁头基于至少两个图案化电池的磁化状态产生回读信号。 耦合到头部的检测器电路确定与回读信号相对应的位模式。 耦合到检测器电路的处理器电路基于位图案确定与磁阻头相对于至少两个图案化单元相关联的位置信息。 系统还包括图案化介质。

公开(公告)号：US06219794B1

公开(公告)日：2001-04-17

申请号：US08947224

申请日：1997-10-08

Applicant: Colin Soutar ,  Danny B. Roberge ,  Alexei Stoianov ,  Rene M. Gilroy ,  Vijayakumar Bhagavatula

Inventor： Colin Soutar ,  Danny B. Roberge ,  Alexei Stoianov ,  Rene M. Gilroy ,  Vijayakumar Bhagavatula

IPC: G06F1214

CPC classification number: H04L9/0866 ,  H04L2209/34

Abstract: This invention describes a secure method for consistently reproducing a digital key using a biometric, such as a fingerprint. The digital key is linked to the biometric only through a secure block of data, known as the protected filter. The key cannot be released from the protected filter other than via the interaction with the correct biometric image. Once generated, the digital key may be used in a system as an encryption/decryption key, or as a personal identification number (PIN).

Abstract translation: 本发明描述了使用诸如指纹之类的生物特征来一致地再现数字密钥的安全方法。 数字键仅通过安全的数据块（称为受保护的过滤器）与生物特征相​​关联。 除了通过与正确的生物特征图像的交互之外，钥匙不能从受保护的过滤器释放。 一旦生成，数字密钥可以在系统中用作加密/解密密钥，或作为个人识别号码（PIN）。