公开(公告)号：US20100014718A1

公开(公告)日：2010-01-21

申请号：US12426210

申请日：2009-04-17

Applicant: Marios Savvides ,  Khalid Harun ,  Vijayakumar Bhagavatula ,  Sung Won Park ,  Yunghui Li

Inventor： Marios Savvides ,  Khalid Harun ,  Vijayakumar Bhagavatula ,  Sung Won Park ,  Yunghui Li

IPC: G06K9/00

CPC classification number: G06K9/00604 ,  G06K9/00288 ,  G06K9/00597 ,  G06T7/11 ,  G06T2207/10004 ,  G06T2207/30201

Abstract: A method and system for uniquely identifying a subject based on an iris image. After obtaining the iris image, the method produces a filtered iris image by applying filters to the iris image to enhance discriminative features of the iris image. The method analyzes an intensity value for pixels in the filtered iris image to produce an iris code that uniquely identifies the subject. The method also creates a segmented iris image by detecting an inner and outer boundary for an iris region in the iris image, and remapping pixels in the iris region, represented in a Cartesian coordinate system, to pixels in the segmented iris image, represented in a log-polar coordinate system, by employing a logarithm representation process. The method also creates a one-dimensional iris string from the iris image by unfolding the iris region by employing a spiral sampling method to obtain sample pixels in the iris region, wherein the sample pixels are the one-dimensional iris string.

Abstract translation: 一种用于基于虹膜图像唯一地识别对象的方法和系统。 获得虹膜图像后，该方法通过将滤光片应用于虹膜图像来产生滤光虹膜图像，以增强虹膜图像的辨别特征。 该方法分析过滤的虹膜图像中的像素的强度值，以产生唯一地识别被摄体的虹膜代码。 该方法还通过检测虹膜图像中的虹膜区域的内部和外部边界并且将以笛卡尔坐标系表示的虹膜区域中的像素重新映射到分割的虹膜图像中的像素，从而形成分割的虹膜图像，其以 对数极坐标系，采用对数表示过程。 该方法还通过使用螺旋取样方法来展开虹膜区域来获得来自虹膜图像的一维虹膜串，以获得虹膜区域中的样本像素，其中样本像素是一维虹膜串。

公开(公告)号：US09454697B2

公开(公告)日：2016-09-27

申请号：US14481861

申请日：2014-09-09

Applicant: Marios Savvides ,  Khalid Harun ,  Vijayakumar Bhagavatula ,  Sungwon Park ,  Yung-Hui Li

Inventor： Marios Savvides ,  Khalid Harun ,  Vijayakumar Bhagavatula ,  Sungwon Park ,  Yung-Hui Li

IPC: G06K9/62 ,  G06K9/00 ,  G06T7/00

CPC classification number: G06K9/00604 ,  G06K9/00288 ,  G06K9/00597 ,  G06T7/11 ,  G06T2207/10004 ,  G06T2207/30201

Abstract: A method and system for uniquely identifying a subject based on an iris image. After obtaining the iris image, the method produces a filtered iris image by applying filters to the iris image to enhance discriminative features of the iris image. The method analyzes an intensity value for pixels in the filtered iris image to produce an iris code that uniquely identifies the subject. The method also creates a segmented iris image by detecting an inner and outer boundary for an iris region in the iris image, and remapping pixels in the iris region, represented in a Cartesian coordinate system, to pixels in the segmented iris image, represented in a log-polar coordinate system, by employing a logarithm representation process. The method also creates a one-dimensional iris string from the iris image by unfolding the iris region by employing a spiral sampling method to obtain sample pixels in the iris region, wherein the sample pixels are the one-dimensional iris string.

公开(公告)号：US20160019422A1

公开(公告)日：2016-01-21

申请号：US14481861

申请日：2014-09-09

Applicant: Marios Savvides ,  Khalid Harun ,  Vijayakumar Bhagavatula ,  Sungwon Park ,  Yung-Hui Li

Inventor： Marios Savvides ,  Khalid Harun ,  Vijayakumar Bhagavatula ,  Sungwon Park ,  Yung-Hui Li

IPC: G06K9/00 ,  G06T7/00

CPC classification number: G06K9/00604 ,  G06K9/00288 ,  G06K9/00597 ,  G06T7/11 ,  G06T2207/10004 ,  G06T2207/30201

Abstract: A method and system for uniquely identifying a subject based on an iris image. After obtaining the iris image, the method produces a filtered iris image by applying filters to the iris image to enhance discriminative features of the iris image. The method analyzes an intensity value for pixels in the filtered iris image to produce an iris code that uniquely identifies the subject. The method also creates a segmented iris image by detecting an inner and outer boundary for an iris region in the iris image, and remapping pixels in the iris region, represented in a Cartesian coordinate system, to pixels in the segmented iris image, represented in a log-polar coordinate system, by employing a logarithm representation process. The method also creates a one-dimensional iris string from the iris image by unfolding the iris region by employing a spiral sampling method to obtain sample pixels in the iris region, wherein the sample pixels are the one-dimensional iris string.

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：US08411910B2

公开(公告)日：2013-04-02

申请号：US12426210

申请日：2009-04-17

Applicant: Marios Savvides ,  Khalid Harun ,  Vijayakumar Bhagavatula ,  Sung Won Park ,  Yunghui Li

Inventor： Marios Savvides ,  Khalid Harun ,  Vijayakumar Bhagavatula ,  Sung Won Park ,  Yunghui Li

IPC: G06K9/62

CPC classification number: G06K9/00604 ,  G06K9/00288 ,  G06K9/00597 ,  G06T7/11 ,  G06T2207/10004 ,  G06T2207/30201

Abstract: A method and system for uniquely identifying a subject based on an iris image. After obtaining the iris image, the method produces a filtered iris image by applying filters to the iris image to enhance discriminative features of the iris image. The method analyzes an intensity value for pixels in the filtered iris image to produce an iris code that uniquely identifies the subject. The method also creates a segmented iris image by detecting an inner and outer boundary for an iris region in the iris image, and remapping pixels in the iris region, represented in a Cartesian coordinate system, to pixels in the segmented iris image, represented in a log-polar coordinate system, by employing a logarithm representation process. The method also creates a one-dimensional iris string from the iris image by unfolding the iris region by employing a spiral sampling method to obtain sample pixels in the iris region, wherein the sample pixels are the one-dimensional iris string.

Abstract translation: 一种用于基于虹膜图像唯一地识别对象的方法和系统。 获得虹膜图像后，该方法通过将滤光片应用于虹膜图像来产生滤光虹膜图像，以增强虹膜图像的辨别特征。 该方法分析过滤的虹膜图像中的像素的强度值，以产生唯一地识别被摄体的虹膜代码。 该方法还通过检测虹膜图像中的虹膜区域的内部和外部边界并且将以笛卡尔坐标系表示的虹膜区域中的像素重新映射到分割的虹膜图像中的像素，从而形成分割的虹膜图像，其以 对数极坐标系，采用对数表示过程。 该方法还通过使用螺旋取样方法来展开虹膜区域来获得来自虹膜图像的一维虹膜串，以获得虹膜区域中的样本像素，其中样本像素是一维虹膜串。

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：US20050018925A1

公开(公告)日：2005-01-27

申请号：US10857072

申请日：2004-05-28

Applicant: Vijayakumar Bhagavatula ,  Marios Savvides

Inventor： Vijayakumar Bhagavatula ,  Marios Savvides

IPC: G06K9/52 ,  G06K9/46 ,  G06K9/00

CPC classification number: G06K9/746

Abstract: A methodology is described to reduce the complexity of filters for face recognition by reducing the memory requirement to, for example, 2 bits/pixel in the frequency domain. Reduced-complexity correlations are achieved by having quantized MACE, UMACE, OTSDF, UOTSDF, MACH, and other filters, in conjunction with a quantized Fourier transform of the input image. This reduces complexity in comparison to the advanced correlation filters using full-phase correlation. However, the verification performance of the reduced complexity filters is comparable to that of full-complexity filters. A special case of using 4-phases to represent both the filter and training/test images in the Fourier domain leads to further reductions in the computational formulations. This also enables the storage and synthesis of filters in limited-memory and limited-computational power platforms such as PDAs, cell phones, etc. An online training algorithm implemented on a face verification system is described for synthesizing correlation filters to handle pose/scale variations. A way to perform efficient face localization is also discussed. Because of the rules governing abstracts, this abstract should not be used to construe the claims.

Abstract translation: 描述了一种方法，通过将存储器需求降低到例如频域中的2位/像素来减少用于人脸识别的滤波器的复杂度。 通过与量化的MACE，UMACE，OTSDF，UOTSDF，MACH和其他滤波器结合输入图像的量化傅立叶变换来实现降低复杂度的相关性。 与使用全相位相关的高级相关滤波器相比，这降低了复杂度。 然而，降低的复杂度滤波器的验证性能与全复杂度滤波器的验证性能相当。 在傅立叶域中使用4相代表滤波器和训练/测试图像的特殊情况导致计算公式的进一步减少。 这也使得能够在有限存储器和有限计算能力平台（例如PDA，蜂窝电话等）中存储和合成滤波器。描述了在面部验证系统上实现的在线训练算法，用于合成相关滤波器以处理姿态/比例变化 。 还讨论了执行有效面部定位的一种方法。 由于管理摘要的规则，本摘要不应用于解释索赔。

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）。