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1.发明授权
公开(公告)号：US5689591A
公开(公告)日：1997-11-18
申请号：US854200
申请日：1992-03-20
申请人： Nikhil Balram , Jose M. F. Moura
发明人： Nikhil Balram , Jose M. F. Moura
摘要： The present invention is directed to an apparatus and method for converting a noncausal, two dimensional signal representative of a digitized image into an equivalent data format that can be filtered by recursive filters. The first step is to estimate an optimal set of parameters by: generating data representative of a potential matrix which represents the signal for a given set of parameters; filtering the potential matrix to arrive at a statistically equivalent recursive data format; inputting white noise to the recursive data format to generate k samples of the signal; obtaining an average value for the correlation {.chi..sub..tau. }; generating data representative of a gradient of a likelihood function; using that data to minimize the likelihood function; comparing the arrived at set of parameters to a previously arrived at set of parameters to determine whether the difference therebetween is within a desired tolerance; and repeating the previous steps until an optimal set of parameters is estimated. The next step is to generate data representative of a potential matrix using the optimal set of parameters. That potential matrix is filtered to arrive at a statistically equivalent recursive representation. The equivalent, recursive representation may be used, for example, for image compression or image smoothing.
摘要翻译： 本发明涉及一种用于将表示数字化图像的非因果二维信号转换为可由递归滤波器滤波的等效数据格式的装置和方法。 第一步是通过以下方式来估计最佳参数集合：产生表示给定参数集合的信号的潜在矩阵的数据; 过滤潜在矩阵以获得统计学上等效的递归数据格式; 将白噪声输入到递归数据格式以产生信号的k个样本; 获得相关性的平均值{chiτ}; 产生表示似然函数的梯度的数据; 使用该数据来最小化似然函数; 将到达的参数集合与先前到达的参数集进行比较，以确定它们之间的差异是否在期望的容限内; 并重复前面的步骤直到估计最佳的参数集合。 下一步是使用最佳参数集生成代表潜在矩阵的数据。 该潜在矩阵被过滤以得到统计学上等同的递归表示。 可以使用等效的递归表示，例如用于图像压缩或图像平滑。
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2.发明授权公开(公告)号：US06201839B1
公开(公告)日：2001-03-13
申请号：US09055003
申请日：1998-04-03
IPC分类号： H03D100
CPC分类号： H03M13/6343 , H03M13/3961 , H03M13/41 , H04L25/03191
摘要： The present invention is directed to a method of determining branch metric values for branches of a trellis for a Viterbi-like detector. The method includes the step of selecting a branch metric function for each of the branches at a certain time index. The method also includes the step of applying the selected function to a plurality of time variant signal samples to determine the metric values.
摘要翻译： 本发明涉及一种确定用于维特比样检测器的网格分支的支路量度值的方法。 该方法包括在特定时间索引处为每个分支选择分支度量函数的步骤。 该方法还包括将所选功能应用于多个时变信号样本以确定度量值的步骤。
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3.发明授权Contrast-invariant registration of cardiac and renal magnetic resonance perfusion images 有权心脏和肾脏磁共振灌注图像的对比不变记录公开(公告)号：US07734075B2
公开(公告)日：2010-06-08
申请号：US11078035
申请日：2005-03-11
申请人： Ying Sun , Marie-Pierre Jolly , Jose M. F. Moura
发明人： Ying Sun , Marie-Pierre Jolly , Jose M. F. Moura
CPC分类号： A61B5/055
摘要： A system and method are provided for contrast-invariant registration of images, the system including a processor, an imaging adapter or a communications adapter for receiving an image data sequence, a user interface adapter for selecting a reference frame from the image sequence or cropping a region of interest (ROI) from the reference frame, a tracking unit for tracking the ROI across the image sequence, and an estimation unit for segmenting the ROI in the reference frame or performing an affine registration for the ROI; and the method including receiving an image sequence, selecting a reference frame from the image sequence, cropping a region of interest (ROI) from the reference frame, tracking the ROI across the image sequence, segmenting the ROI in the reference frame, and performing an affine registration for the ROI.
摘要翻译： 提供了用于对比度不变的图像配准的系统和方法，所述系统包括处理器，成像适配器或用于接收图像数据序列的通信适配器，用于从图像序列中选择参考帧的用户接口适配器或裁剪 来自参考帧的感兴趣区域（ROI），用于跟踪跨越图像序列的ROI的跟踪单元，以及用于在参考帧中分割ROI或对ROI执行仿射注册的估计单元; 并且所述方法包括接收图像序列，从所述图像序列中选择参考帧，从所述参考帧裁剪感兴趣区域（ROI），沿所述图像序列跟踪所述ROI，在所述参考帧中分割所述ROI，以及执行 ROI的仿射注册。
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公开(公告)号：US06438180B1
公开(公告)日：2002-08-20
申请号：US09259195
申请日：1999-03-01
IPC分类号： H03D100
CPC分类号： H03M13/41 , H03M13/3961 , H03M13/6343 , H04L25/03191
摘要： A method of determining branch metric values in a detector. The method includes receiving a plurality of time variant signal samples, the signal samples having one of signal-dependent noise, correlated noise, and both signal dependent and correlated noise associated therewith. The method also includes selecting a branch metric function at a certain time index and applying the selected function to the signal samples to determine the metric values.
摘要翻译： 确定检测器中分支度量值的方法。 该方法包括接收多个时变信号样本，信号样本具有信号相关噪声，相关噪声之一以及与之相关联的信号相关噪声和相关噪声。 该方法还包括在特定时间索引处选择分支度量函数并将所选择的函数应用于信号采样以确定度量值。
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5.发明授权Adaptive parametric signal predistorter for compensation of time varying linear and nonlinear amplifier distortion 失效自适应参数信号预失真器，用于补偿时变线性和非线性放大器失真
公开(公告)号：US5900778A
公开(公告)日：1999-05-04
申请号：US852944
申请日：1997-05-08
CPC分类号： H03F1/3247 , H03F1/3258 , H03F2200/57 , H03F2201/3233
摘要： A high power amplifier system includes an on-line adaptive predistorter for generating predistorted complex data signals to a high power amplifier in response to receiving incoming complex data signals from a remote source. The predistorted complex data signals enable the high powered amplifier to output signals corresponding to the incoming complex data signals. The amplifier system includes an off-line adaptive predistorter which has an adaptive parametric forward filter for combining predistorted complex data signals and demodulated complex data signals, produced from the output of the high power amplifier, to produce an optimized forward amplitude filter that emulates the forward amplitude response of the amplifier, and an optimized inverse phase filter that emulates the inverse phase response of the amplifier. An adaptive parametric inverse filter combines random amplitude data and the optimized forward amplitude filter of the amplifier to produce an optimized inverse amplitude filter that emulates the inverse amplitude response of the amplifier. An off-line to on-line converter combines the optimized inverse amplitude filter, the optimized inverse phase filter and exemplary complex data to produce the predistorted complex data utilized by the on-line adaptive predistorter for generating the predistorted complex data signals.
摘要翻译： 高功率放大器系统包括在线自适应预失真器，用于响应于接收来自远程源的复杂数据信号而向大功率放大器产生预失真复数数据信号。 预失真的复数数据信号使得高功率放大器能够输出对应于输入的复数数据信号的信号。 放大器系统包括离线自适应预失真器，其具有用于组合预失真复数数据信号的自适应参数正向滤波器和从高功率放大器的输出产生的解调复数数据信号，以产生模拟向前的优化的前向幅度滤波器 放大器的幅度响应以及模拟放大器的反相位响应的优化的反相滤波器。 自适应参数反滤波器组合随机振幅数据和放大器的优化的前向幅度滤波器，以产生优化的反向幅度滤波器，其模拟放大器的反向幅度响应。 离线到在线转换器组合优化的逆幅度滤波器，优化的反相滤波器和示例性复数数据，以产生由在线自适应预失真器用于产生预失真复数数据信号的预失真复数数据。
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公开(公告)号：US5854856A
公开(公告)日：1998-12-29
申请号：US504379
申请日：1995-07-19
摘要： A content based method of compressing a segment of video is implemented in two stages. In a spatial integration stage, figures are represented in terms of compact models. In a temporal integration stage, which uses the information from the spatial integration stage, constructs, i.e., world images and data describing relationships between world images and frames, are generated. In operation, each frame in a series of frames is preprocessed to tessellate any moving figures and to obtain motion data for the moving figures and for the image background. The figure motion data is stored in a manner so as to associate the motion data with the original frame. Frame information identifying the size and position of each frame with respect to a background world image is also stored. Each tessellated figure is compared to the original frame to produce a template for each moving figure and a template for the background. Each template is compared to a world image that is associated with that template so that material common to both can be cut and the remaining material added to form a new world image. The steps are repeated until all frames in the segment are processed. The resulting world image data, figure motion data, and frame information are output for transmission or storage. The world image data may be compressed prior to transmission or storage.
摘要翻译： 基于内容的压缩视频片段的方法分两个阶段实现。 在空间集成阶段，数字用紧凑模型表示。 在使用来自空间积分阶段的信息的时间积分阶段中，生成描绘世界图像和帧之间的关系的世界图像和数据的构造。 在操作中，一系列帧中的每个帧被预处理以对任何运动图形进行细分，并获得运动图形和图像背景的运动数据。 图形运动数据以使得运动数据与原始帧相关联的方式被存储。 还存储了识别每个帧相对于背景世界图像的大小和位置的帧信息。 将每个细分图与原始帧进行比较，以生成每个运动图形的模板和背景的模板。 将每个模板与与该模板相关联的世界图像进行比较，从而可以剪切两者共同的材料，并添加剩余的材料以形成新的世界图像。 重复这些步骤，直到处理段中的所有帧。 所产生的世界图像数据，图形运动数据和帧信息被输出用于传输或存储。 世界图像数据可以在传输或存储之前被压缩。
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公开(公告)号：US20090033549A1
公开(公告)日：2009-02-05
申请号：US12217839
申请日：2008-07-09
申请人： Yuanwei Jin , Jose M. F. Moura
发明人： Yuanwei Jin , Jose M. F. Moura
IPC分类号： G01S13/90
CPC分类号： G01S13/9035
摘要： A method and apparatus for target focusing and ghost image removal in synthetic aperture radar (SAR) is disclosed. Conventional SAR is not designed for imaging targets in a rich scattering environment. In this case, ghost images due to secondary reflections appear in the SAR images. We demonstrate, how, from a rough estimate of the target location obtained from a conventional SAR image and using time reversal, time reversal techniques can be applied to SAR to focus on the target with improved resolution, and reduce or remove ghost images.
摘要翻译： 公开了一种用于合成孔径雷达（SAR）中的目标聚焦和重影图像去除的方法和装置。 传统的SAR不是用于在富散射环境中成像目标。 在这种情况下，SAR图像中出现由于二次反射造成的幻影。 我们演示如何从传统SAR图像获得的目标位置的粗略估计和使用时间反转，时间反演技术可以应用于SAR，以改进的分辨率来集中在目标上，并减少或去除重影图像。
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