公开(公告)号：US20150369896A1

公开(公告)日：2015-12-24

申请号：US14650647

申请日：2013-12-10

申请人： Joseph DAGHER ,  Audrey FAN ,  Ali BILGIN

发明人： Joseph Dagher ,  Audrey Fan ,  Ali Bilgin

IPC分类号： G01R33/56 ,  A61B5/055 ,  G01R33/385 ,  G01R33/48 ,  G01R33/34

CPC分类号： G01R33/5608 ,  A61B5/055 ,  A61B5/7285 ,  G01R33/34 ,  G01R33/385 ,  G01R33/4806 ,  G01R33/56 ,  G01R33/5615 ,  G01R33/5616 ,  G01R33/56554

摘要： Described here are systems and methods for estimating phase measurements obtained using a magnetic resonance imaging (MRI) system such that phase ambiguities in the measurements are significantly mitigated. Echo time spacings are determined by optimizing phase ambiguity functions associated with the echo time spacings. Data is then acquired using a multi-echo pulse sequence that utilizes the determined echo spacings. Phase measurements are then estimated and images are reconstructed using a reconstruction technique that disambiguates the phase ambiguities in the phase measurements.

摘要翻译： 这里描述了用于估计使用磁共振成像（MRI）系统获得的相位测量的系统和方法，使得测量中的相位模糊度被显着减轻。 通过优化与回波时间间隔相关联的相位模糊度函数来确定回波时间间隔。 然后使用利用确定的回波间隔的多回波脉冲序列获取数据。 然后估计相位测量，并使用消除相位测量中的相位模糊的重建技术重建图像。

公开(公告)号：US20110116724A1

公开(公告)日：2011-05-19

申请号：US12942427

申请日：2010-11-09

申请人： Ali Bilgin ,  Yookyung Kim ,  Mariappan S. Nadar

发明人： Ali Bilgin ,  Yookyung Kim ,  Mariappan S. Nadar

IPC分类号： G06K9/36

CPC分类号： G01R33/5608 ,  G06T11/006 ,  G06T2211/424

摘要： A method for constructing an image includes acquiring image data in a first domain. The acquired image data is transformed from the first domain into a second domain in which the acquired image data exhibits a high degree of sparsity. An initial set of transform coefficients is approximated for transforming the image data from the second domain into a third domain in which the image may be displayed. The approximated initial set of transform coefficients is updated based on a weighing of where substantial transform coefficients are likely to be located relative to the initial set of transform coefficients. An image is constructed in the third domain based on the updated set of transform coefficients. The constructed image is displayed.

摘要翻译： 一种用于构建图像的方法包括获取第一域中的图像数据。 所获取的图像数据从第一域变换到第二域，其中所获取的图像数据表现出高度的稀疏性。 近似变换系数的初始集合，用于将来自第二域的图像数据变换成可以显示图像的第三域。 基于对相对于初始变换系数集合可能存在实质变换系数的权重来更新近似初始变换系数集合。 基于更新的变换系数组，在第三域中构建图像。 显示构图。

公开(公告)号：US20060056706A1

公开(公告)日：2006-03-16

申请号：US10534620

申请日：2003-11-15

申请人： Michael Marcellin ,  Ali Bilgin

发明人： Michael Marcellin ,  Ali Bilgin

IPC分类号： G06K9/36

CPC分类号： H04N19/66 ,  H04N19/63 ,  H04N19/645 ,  H04N19/65 ,  H04N19/89

摘要： The present invention provides a method for decoding corrupt codestreams for encoded digital imagery and video and, in particular, JPEG2000 codestreams with improved error resilience properties. The decoding techniques apply to a class of coding algorithms in which the data from underlying images are partitioned, typically to allow decoding of different spatial sections of the image, and the rules governing the dependencies within and perhaps between partitioned sets are known. Corrupt codestreams are decoded with improved image quality by observing the partitions imposed by the underlying algorithm (200), detecting an error in a partition set (202), analyzing the dependencies within and perhaps between the partitions (204), determining what sections of encoded data that follow the error in the partition set can be salvaged (206), and decoding those sections (208). Even though there might be errors in a particular partition, portions of that partition might still be completely or partially decodable, depending on certain modes or “switches” used during the creation of the codestream.

摘要翻译： 本发明提供一种用于解码用于编码数字图像和视频的损坏码流的方法，特别是具有改进的误差弹性属性的JPEG2000码流。 解码技术适用于一类编码算法，其中来自底层图像的数据被分割，通常允许对图像的不同空间部分进行解码，并且在已分配的集合之内以及也可能在分区集之间的依赖性的规则是已知的。 通过观察底层算法（200）施加的分区，检测分区集（202）中的错误，分析分区（204）内部的可能性，并且可能在分区（204）之间确定哪些部分被编码 跟踪分区集中的错误的数据可以被消除（206），并对这些部分进行解码（208）。 即使特定分区中可能存在错误，根据在创建码流期间使用的某些模式或“开关”，该分区的部分仍然可能是完全或部分可解码的。

公开(公告)号：US08126279B2

公开(公告)日：2012-02-28

申请号：US12146582

申请日：2008-06-26

申请人： Michael W. Marcellin ,  Ali Bilgin ,  Hariharan G. Lalgudi ,  Mariappan S. Nadar

发明人： Michael W. Marcellin ,  Ali Bilgin ,  Hariharan G. Lalgudi ,  Mariappan S. Nadar

IPC分类号： G06K9/36

CPC分类号： H04N19/647 ,  G06T15/08

摘要： A method for compressing 2D images includes determining a depth map for each of a plurality of sequential 2D images of a 3D volumetric image, determining coordinate transformations the 2D images based on the depth maps and a geometric relationship between the 3D volumetric image and each of the 2D image, performing a lifting-based view compensated wavelet transform on the 2D images using the coordinate transformations to generate a plurality of wavelet coefficients and compressing the wavelet coefficients and depth maps to generate a compressed representation of the 2D images.

摘要翻译： 一种用于压缩2D图像的方法包括：确定3D体积图像的多个连续2D图像中的每一个的深度图，基于深度图确定2D图像的坐标变换，以及3D体积图像与3D体积图像中的每一个之间的几何关系 2D图像，使用坐标变换对2D图像执行基于提升的观看补偿小波变换，以生成多个小波系数并压缩小波系数和深度图以生成2D图像的压缩表示。

公开(公告)号：US08064708B2

公开(公告)日：2011-11-22

申请号：US12039008

申请日：2008-02-28

申请人： Michael W. Marcellin ,  Ali Bilgin ,  Hariharan G. Lalgudi

发明人： Michael W. Marcellin ,  Ali Bilgin ,  Hariharan G. Lalgudi

IPC分类号： G06K9/36

CPC分类号： H04N19/34 ,  H04N19/115 ,  H04N19/12 ,  H04N19/124 ,  H04N19/152 ,  H04N19/17 ,  H04N19/63

摘要： A method for remotely visualizing an image on a client includes the steps of rendering a 2D image from image data on a server, applying a 2D wavelet transform to the 2D image on the server to generate a plurality of sub-bands, identifying code blocks of the sub-bands that correspond to a region of interest in the 2D image on the server, compressing a number of bit planes of each code block using one of a plurality of coding techniques on the server based on the number of bit planes to generate compressed codes, sending the compressed codes from the server to the client, and visualizing a new 2D image on the client using the received compressed codes.

摘要翻译： 用于在客户端上远程可视化图像的方法包括以下步骤：从服务器上的图像数据渲染2D图像，将2D小波变换应用于服务器上的2D图像，以生成多个子带，识别代码块 对应于服务器上的2D图像中的感兴趣区域的子带，基于位平面的数量，在服务器上使用多种编码技术之一来压缩每个码块的位平面，以生成压缩 代码，将压缩代码从服务器发送到客户端，并使用接收到的压缩代码在客户端上可视化新的2D图像。

公开(公告)号：US07580582B2

公开(公告)日：2009-08-25

申请号：US10534620

申请日：2003-11-15

申请人： Michael W. Marcellin ,  Ali Bilgin ,  Zhenyu Wu

发明人： Michael W. Marcellin ,  Ali Bilgin ,  Zhenyu Wu

IPC分类号： G06K9/36

CPC分类号： H04N19/66 ,  H04N19/63 ,  H04N19/645 ,  H04N19/65 ,  H04N19/89

摘要： The present invention provides a method for decoding corrupt codestreams for encoded digital imagery and video and, in particular, JPEG2000 codestreams with improved error resilience properties. The decoding techniques apply to a class of coding algorithms in which the data from underlying images are partitioned, typically to allow decoding of different spatial sections of the image, and the rules governing the dependencies within and perhaps between partitioned sets are known. Corrupt codestreams are decoded with improved image quality by observing the partitions imposed by the underlying algorithm (200), detecting an error in a partition set (202), analyzing the dependencies within and perhaps between the partitions (204), determining what sections of encoded data that follow the error in the partition set can be salvaged (206), and decoding those sections (208). Even though there might be errors in a particular partition, portions of that partition might still be completely or partially decodable, depending on certain modes or “switches” used during the creation of the codestream.

摘要翻译： 本发明提供一种用于解码用于编码数字图像和视频的损坏码流的方法，特别是具有改进的误差弹性属性的JPEG2000码流。 解码技术适用于一类编码算法，其中来自底层图像的数据被分割，通常允许对图像的不同空间部分进行解码，并且在已分配的集合之内以及也可能在分区集之间的依赖性的规则是已知的。 通过观察底层算法（200）施加的分区，检测分区集（202）中的错误，分析分区（204）内部的可能性，并且可能在分区（204）之间确定哪些部分被编码 跟踪分区集中的错误的数据可以被消除（206），并对这些部分进行解码（208）。 即使特定分区中可能存在错误，根据在创建码流期间使用的某些模式或“开关”，该分区的部分仍然可能是完全或部分可解码的。

公开(公告)号：US20090129690A1

公开(公告)日：2009-05-21

申请号：US12146582

申请日：2008-06-26

申请人： Michael W. Marcellin ,  Ali Bilgin ,  Hariharan G. Lalgudi ,  Mariappan S. Nadar

发明人： Michael W. Marcellin ,  Ali Bilgin ,  Hariharan G. Lalgudi ,  Mariappan S. Nadar

IPC分类号： G06K9/54

CPC分类号： H04N19/647 ,  G06T15/08

摘要： A method for compressing 2D images includes determining a depth map for each of a plurality of sequential 2D images of a 3D volumetric image, determining coordinate transformations the 2D images based on the depth maps and a geometric relationship between the 3D volumetric image and each of the 2D image, performing a lifting-based view compensated wavelet transform on the 2D images using the coordinate transformations to generate a plurality of wavelet coefficients and compressing the wavelet coefficients and depth maps to generate a compressed representation of the 2D images.

摘要翻译： 一种用于压缩2D图像的方法包括：确定3D体积图像的多个连续2D图像中的每一个的深度图，基于深度图确定2D图像的坐标变换，以及3D体积图像与3D体积图像中的每一个之间的几何关系 2D图像，使用坐标变换对2D图像执行基于提升的观看补偿小波变换，以生成多个小波系数并压缩小波系数和深度图以生成2D图像的压缩表示。

公开(公告)号：US20080219570A1

公开(公告)日：2008-09-11

申请号：US12039008

申请日：2008-02-28

申请人： Michael W. Marcellin ,  Ali Bilgin ,  Hariharan G. Lalgudi

发明人： Michael W. Marcellin ,  Ali Bilgin ,  Hariharan G. Lalgudi

IPC分类号： G06K9/36

CPC分类号： H04N19/34 ,  H04N19/115 ,  H04N19/12 ,  H04N19/124 ,  H04N19/152 ,  H04N19/17 ,  H04N19/63

摘要： A method for remotely visualizing an image on a client includes the steps of rendering a 2D image from image data on a server, applying a 2D wavelet transform to the 2D image on the server to generate a plurality of sub-bands, identifying code blocks of the sub-bands that correspond to a region of interest in the 2D image on the server, compressing a number of bit planes of each code block using one of a plurality of coding techniques on the server based on the number of bit planes to generate compressed codes, sending the compressed codes from the server to the client, and visualizing a new 2D image on the client using the received compressed codes.

摘要翻译： 用于在客户端上远程可视化图像的方法包括以下步骤：从服务器上的图像数据渲染2D图像，将2D小波变换应用于服务器上的2D图像，以生成多个子带，识别代码块 对应于服务器上的2D图像中的感兴趣区域的子带，基于位平面的数量，在服务器上使用多种编码技术之一来压缩每个码块的位平面，以生成压缩 代码，将压缩代码从服务器发送到客户端，并使用接收到的压缩代码在客户端上可视化新的2D图像。

公开(公告)号：US10067211B2

公开(公告)日：2018-09-04

申请号：US14650647

申请日：2013-12-10

申请人： Joseph Dagher ,  Audrey Fan ,  Ali Bilgin

发明人： Joseph Dagher ,  Audrey Fan ,  Ali Bilgin

IPC分类号： G01V3/00 ,  G01R33/50 ,  G01R33/56 ,  A61B5/055 ,  G01R33/561 ,  G01R33/565 ,  G01R33/34 ,  G01R33/385 ,  G01R33/48 ,  A61B5/00

摘要： Described here are systems and methods for estimating phase measurements obtained using a magnetic resonance imaging (MRI) system such that phase ambiguities in the measurements are significantly mitigated. Echo time spacings are determined by optimizing phase ambiguity functions associated with the echo time spacings. Data is then acquired using a multi-echo pulse sequence that utilizes the determined echo spacings. Phase measurements are then estimated and images are reconstructed using a reconstruction technique that disambiguates the phase ambiguities in the phase measurements.

公开(公告)号：US08520928B2

公开(公告)日：2013-08-27

申请号：US13104255

申请日：2011-05-10

申请人： Ali Bilgin ,  Yookyung Kim ,  Mariappan S. Nadar ,  Rajagopalan Sundaresan

发明人： Ali Bilgin ,  Yookyung Kim ,  Mariappan S. Nadar ,  Rajagopalan Sundaresan

IPC分类号： G06K9/00

CPC分类号： H04N19/577 ,  H04N19/61

摘要： A method for reconstructing a digital image from a set of measurements includes providing a previous image frame in a time series of measurements of an image signal and a current image frame in the time series, calculating an estimated motion vector for a spatial point and current time point between the previous and current image frames, calculating a motion compensated current image frame from the previous image frame, estimating a known support set of a sparse signal estimate of the motion compensated current image frame where the support set comprises indices of non-zero elements of the sparse signal estimate, calculating a sparse signal corresponding to the current image frame whose support contains a smallest number of new additions to the known support set while satisfying a data consistency constraint, and correcting the motion compensated current image frame image frame from the sparse signal.

摘要翻译： 一种用于从一组测量重建数字图像的方法包括在时间序列中以图像信号和当前图像帧的时间序列测量的时间序列提供先前的图像帧，计算空间点和当前时间的估计的运动矢量 在先前图像帧和当前图像帧之间，从前一图像帧计算运动补偿当前图像帧，估计运动补偿当前图像帧的稀疏信号估计的已知支持集合，其中支持集合包括非零元素的索引 的稀疏信号估计，计算对应于当前图像帧的稀疏信号，其支持在满足数据一致性约束的同时包含对已知支持集合的最小数量的新加法，并且从稀疏信息校正运动补偿的当前图像帧图像帧 信号。