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1.发明授权公开(公告)号：US09986923B2
公开(公告)日：2018-06-05
申请号：US14593271
申请日：2015-01-09
Applicant: Xerox Corporation
Inventor： Lalit Keshav Mestha , Martin Edward Hoover , Survi Kyal
CPC classification number: A61B5/02433 , A61B5/0013 , A61B5/7203 , A61B5/7225 , A61B5/725 , A61B5/748 , A61B2576/00
Abstract: What is disclosed is a system and method for selecting a region of interest for extracting physiological parameters from a video of a subject. In one embodiment the present method involves performing the following. First, time-series signals are received which have been generated by having processing image frames of a video of a subject captured using a single band video camera with a bandpass filter with a pass band in a wavelength range of 495-565 nm and/or 800-1000 nm. The regions of interest are areas where a plethysmographic signal can be detected by the camera. Each time-series signal is associated with a different region of interest. A signal strength is then calculated for each of the time-series signals. The region associated with the time-series signal having a highest signal strength is selected. The time-series signal associated with the selected region can be processed to extract a videoplethysmographic (VPG) signal containing physiological parameters.
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公开(公告)号：US09514537B2
公开(公告)日：2016-12-06
申请号：US14141610
申请日：2013-12-27
Applicant: Xerox Corporation
Inventor： Edgar A. Bernal , Wencheng Wu , Lalit Keshav Mestha
CPC classification number: G06T7/0075 , G06K9/4604 , G06T7/11 , G06T7/521 , G06T7/593 , G06T2207/10016 , G06T2207/10024 , G06T2207/20004 , G06T2207/20104 , G06T2207/30201
Abstract: What is disclosed is a system and method for adaptively reconstructing a depth map of a scene. In one embodiment, upon receiving a mask identifying a region of interest (ROI), a processor changes either a spatial attribute of a pattern of source light projected on the scene by a light modulator which projects an undistorted pattern of light with known spatio-temporal attributes on the scene, or changes an operative resolution of a depth map reconstruction module. A sensing device detects the reflected pattern of light. A depth map of the scene is generated by the depth map reconstruction module by establishing correspondences between spatial attributes in the detected pattern and spatial attributes of the projected undistorted pattern and triangulating the correspondences to characterize differences therebetween. The depth map is such that a spatial resolution in the ROI is higher relative to a spatial resolution of locations not within the ROI.
Abstract translation: 公开的是用于自适应地重建场景的深度图的系统和方法。 在一个实施例中，在接收到识别感兴趣区域（ROI）的掩模之后，处理器通过光调制器来改变投射在场景上的源光的图案的空间属性，所述光调制器将未失真的光模式投射到已知的时空 场景上的属性，或改变深度图重建模块的可操作分辨率。 感测装置检测光的反射图案。 由深度图重建模块通过建立检测图案中的空间属性与投射的未失真模式的空间属性之间的对应关系并对其对应性进行三角测量，来形成场景的深度图。 深度图使得ROI中的空间分辨率相对于不在ROI内的位置的空间分辨率较高。
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3.发明授权Discriminating between atrial fibrillation and sinus rhythm in physiological signals obtained from video 有权从视频获得的生理信号中区分心房颤动和窦性心律公开(公告)号：US09320440B2
公开(公告)日：2016-04-26
申请号：US14242322
申请日：2014-04-01
Applicant: Xerox Corporation
Inventor： Survi Kyal , Lalit Keshav Mestha , Jean-Philippe Couderc
IPC: A61B5/02 , A61B5/00 , A61B5/0295 , A61B5/107
CPC classification number: A61B5/0077 , A61B5/0082 , A61B5/0295 , A61B5/1073
Abstract: What is disclosed is a system and method for determining whether a subject is in atrial fibrillation. A video is received of a region of exposed skin of a subject. The video is acquired of a region where a videoplethysmographic (VPG) signal can be registered by at least one imaging channel of a video imaging device. For each batch of image frames, pixels associated with the region of exposed skin are isolated and processed to obtain a time-series signal. A VPG signal is extracted from the time-series signal. The power spectral density (PSD) is computed across all frequencies within the VPG signal. A pulse harmonic strength (PHS) is calculated for this VPG signal. The pulse harmonic strength is compared to a discrimination threshold, defined herein. A determination is made whether the subject in the video is in atrial fibrillation or in normal sinus rhythm.
Abstract translation: 公开的是用于确定受试者是否在心房颤动中的系统和方法。 收到受试者暴露皮肤区域的视频。 获取视频体积描记（VPG）信号的区域可以由视频成像设备的至少一个成像通道注册的视频。 对于每批图像帧，与暴露皮肤区域相关联的像素被隔离并处理以获得时间序列信号。 从时间序列信号中提取VPG信号。 在VPG信号内的所有频率上计算功率谱密度（PSD）。 为该VPG信号计算脉冲谐波强度（PHS）。 将脉冲谐波强度与本文定义的鉴别阈值进行比较。 视频中的主体是否处于心房颤动或正常窦性心律中。
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4.发明授权公开(公告)号：US09070218B2
公开(公告)日：2015-06-30
申请号：US13932791
申请日：2013-07-01
Applicant: Xerox Corporation
Inventor： Edgar A. Bernal , Beilei Xu , Lalit Keshav Mestha
CPC classification number: G06T11/006 , G06T1/0007 , G06T7/11 , G06T2207/10004 , G06T2207/20052 , H04N5/225
Abstract: A method for reconstructing an image of a scene captured using a compressed sensing device. A mask is received which identifies at least one region of interest in an image of a scene. Measurements are then obtained of the scene using a compressed sensing device comprising, at least in part, a spatial light modulator configuring a plurality of spatial patterns according to a set of basis functions each having a different spatial resolution. A spatial resolution is adaptively modified according to the mask. Each pattern focuses incoming light of the scene onto a detector which samples sequential measurements of light. These measurements comprise a sequence of projection coefficients corresponding to the scene. Thereafter, an appearance of the scene is reconstructed utilizing a compressed sensing framework which reconstructs the image from the sequence of projection coefficients.
Abstract translation: 一种用于重构使用压缩感测装置拍摄的场景的图像的方法。 接收到掩模，其识别场景的图像中的至少一个感兴趣区域。 然后使用压缩感测装置获得场景的测量，所述压缩感测装置至少部分地包括根据每个具有不同空间分辨率的基础函数的集合来配置多个空间模式的空间光调制器。 根据掩模自适应地修改空间分辨率。 每个模式将场景的入射光聚焦到对光进行顺序测量的检测器上。 这些测量包括对应于场景的一系列投影系数。 此后，利用从投影系数序列重建图像的压缩感测框架来重建场景的外观。
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公开(公告)号：US20140287135A1
公开(公告)日：2014-09-25
申请号：US13849114
申请日：2013-03-22
Applicant: XEROX CORPORATION
Inventor： Edward B. Caruthers , Grace T. Brewington , Lalit Keshav Mestha
IPC: B05D7/00
Abstract: A method for applying a uniform coating to a non-uniform substrate, the method including: a) optically characterizing the non-uniform substrate; b) adjusting a thickness and a color of a primer layer to achieve a first target color while depositing the primer layer on the non-uniform substrate; c) optically characterizing the non-uniform substrate comprising the primer layer deposited thereon; and, d) adjusting a thickness and a color of a first paint layer to achieve a second target color while depositing the first paint layer on the non-uniform substrate comprising the primer layer deposited thereon.
Abstract translation: 一种将均匀涂层施加到不均匀基底的方法，所述方法包括：a）光学表征所述不均匀基底; b）调整底漆层的厚度和颜色以实现第一目标颜色，同时将底漆层沉积在非均匀基材上; c）光学地表征包含沉积在其上的底漆层的非均匀基材; 以及d）调整第一涂料层的厚度和颜色以获得第二目标颜色，同时在包含沉积在其上的底漆层的非均匀基材上沉积第一涂料层。
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Patent Agency Ranking
6.发明授权Material identification from a spectral filtered patterned image without demosaicing 有权材料识别从光谱滤波图案图像没有去马赛克公开(公告)号：US09523608B2
公开(公告)日：2016-12-20
申请号：US13715446
申请日：2012-12-14
Applicant: Xerox Corporation
Inventor： Beilei Xu , Lalit Keshav Mestha , Yao Rong Wang , Peter Paul
CPC classification number: G01J3/2823 , G01J3/36 , G01J3/51 , G01J3/513 , G06K9/00369 , G06K9/00785 , G06K9/2018 , H04N5/332 , H04N9/07
Abstract: What is disclosed is a system and method for processing image data acquired using a multi-band infrared camera system with a spectral mosaic filter arranged in a geometric pattern without having to perform a demosaicing that is typical with processing data from an array of sensors. In one embodiment, image data that has been captured using a camera system that has a spectral filter mosaic comprising a plurality of spectral filters arrayed on a grid. A material index is determined, using intensity values collected by sensor elements associated with a cell's respective spectral filters. All of the material indices collectively generate a material index image. Thereafter, material identification is performed on the material index image using, for example, pixel classification. Because the demosaicing step can be effectively avoided, image processing time is reduced. The teachings hereof find their uses in a wide array of applications including automated HOV/HOT violation detection.
Abstract translation: 所公开的是一种用于处理使用具有以几何图案排列的频谱马赛克滤波器的多频带红外相机系统获取的图像数据的系统和方法，而不必执行典型的来自传感器阵列的数据处理的去马赛克。 在一个实施例中，已经使用具有包括排列在网格上的多个频谱滤波器的频谱滤波器马赛克的相机系统捕获的图像数据。 使用与单元相应的光谱滤波器相关联的传感器元件收集的强度值来确定材料索引。 所有材料指标共同生成材料索引图像。 此后，使用例如像素分类对材料索引图像进行材料识别。 因为可以有效地避免去马赛克步骤，所以减少了图像处理时间。 其教导在各种应用中发现其用途，包括自动HOV / HOT违规检测。
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公开(公告)号：US09521335B2
公开(公告)日：2016-12-13
申请号：US14306817
申请日：2014-06-17
Applicant: Xerox Corporation
Inventor： Lalit Keshav Mestha , Beilei Xu , Rakesh Suresh Kulkarni
IPC: G06K9/00 , H04N5/33 , G01J5/10 , G01J5/08 , H04N5/30 , A61B5/01 , G01J5/02 , G06T7/00 , G01J5/00 , A61B5/00
CPC classification number: H04N5/33 , A61B5/0077 , A61B5/01 , A61B5/015 , G01J5/0025 , G01J5/025 , G01J5/089 , G01J5/10 , G01J2005/0077 , G06T7/0016 , G06T2207/10016 , G06T2207/10048 , G06T2207/30076 , G06T2207/30088 , H04N5/23229 , H04N5/30
Abstract: What is disclosed is a system and method for detecting febrile seizure using a thermal video camera. In one embodiment, a video is received comprising time-sequential thermal images of a subject. The video is acquired of the subject in real-time using a thermal video system. Each thermal image comprises a plurality of pixels with an intensity value of each pixel corresponding to a temperature. The thermal images are processed to determine an occurrence of a febrile seizure. The processing involves identifying a region of interest in the thermal image and determining a temperature for the region of interest based on values of the pixels isolated in that region of interest. Thereafter, a rate of change of temperatures is obtained for the subject in real-time on a per-frame basis. If the rate of change is determined to have exceeded a pre-defined threshold level, then the subject is having a febrile seizure.
Abstract translation: 公开的是使用热摄像机检测发热性惊厥的系统和方法。 在一个实施例中，接收包括被摄体的时间顺序的热图像的视频。 使用热视频系统实时拍摄该主题的视频。 每个热图像包括具有对应于温度的每个像素的强度值的多个像素。 热图像被处理以确定发热发作。 处理涉及识别热图像中的感兴趣区域，并且基于在该感兴趣区域中分离的像素的值来确定感兴趣区域的温度。 此后，以每帧为基础实时获得对象的温度变化率。 如果变化率被确定为已经超过预定义的阈值水平，则受试者具有发热性发作。
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公开(公告)号：US09412185B2
公开(公告)日：2016-08-09
申请号：US14753238
申请日：2015-06-29
Applicant: Xerox Corporation
Inventor： Edgar A. Bernal , Beilei Xu , Lalit Keshav Mestha
CPC classification number: G06T11/006 , G06T1/0007 , G06T7/11 , G06T2207/10004 , G06T2207/20052 , H04N5/225
Abstract: A method for reconstructing an image of a scene captured using a compressed sensing device. A mask is received which identifies at least one region of interest in an image of a scene. Measurements are then obtained of the scene using a compressed sensing device comprising, at least in part, a spatial light modulator configuring a plurality of spatial patterns according to a set of basis functions each having a different spatial resolution. A spatial resolution is adaptively modified according to the mask. Each pattern focuses incoming light of the scene onto a detector which samples sequential measurements of light. These measurements comprise a sequence of projection coefficients corresponding to the scene. Thereafter, an appearance of the scene is reconstructed utilizing a compressed sensing framework which reconstructs the image from the sequence of projection coefficients.
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公开(公告)号：US09384554B2
公开(公告)日：2016-07-05
申请号：US14858564
申请日：2015-09-18
Applicant: Xerox Corporation
Inventor： Beilei Xu , Lalit Keshav Mestha , Edgar A. Bernal
CPC classification number: G06T7/0075 , G01B11/25 , G06K9/36 , G06K9/46 , G06T7/521 , G06T7/55 , G06T7/593 , G06T2207/10012 , G06T2207/20104 , G06T2207/30076
Abstract: What is disclosed is system and method for contemporaneously reconstructing images of a scene illuminated with unstructured and structured illumination sources. In one embodiment, the system comprises capturing a first 2D image containing energy reflected from a scene being illuminated by a structured illumination source and a second 2D image containing energy reflected from the scene being illuminated by an unstructured illumination source. A controller effectuates a manipulation of the structured and unstructured illumination sources during capture of the video. A processor is configured to execute machine readable program instructions enabling the controller to manipulate the illumination sources, and for effectuating the contemporaneous reconstruction of a 2D intensity map of the scene using the second 2D image and of a 3D surface map of the scene using the first 2D image. The reconstruction is effectuated by manipulating the illumination sources.
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公开(公告)号：US09377294B2
公开(公告)日：2016-06-28
申请号：US13920241
申请日：2013-06-18
Applicant: Xerox Corporation
Inventor： Wencheng Wu , Edgar A. Bernal , Lalit Keshav Mestha , Paul R. Austin
CPC classification number: G01B11/00 , G01B11/2513 , H04M2250/52
Abstract: What is disclosed is a wireless cellular device capable of determining a volume of an object in an image captured by a camera of that apparatus. In one embodiment, the present wireless cellular device comprises an illuminator for projecting a pattern of structured light with known spatial characteristics, and a camera for capturing images of an object for which a volume is to be estimated. The camera is sensitive to a wavelength range of the projected pattern of structured light. A spatial distortion is introduced by a reflection of the projected pattern off a surface of the object. And processor executing machine readable program instructions for performing the method of: receiving an image of the object from the camera; processing the image to generate a depth map; and estimating a volume of the object from the depth map. A method for using the present wireless cellular device is also provided.
Abstract translation: 所公开的是能够确定由该设备的照相机拍摄的图像中的物体的体积的无线蜂窝设备。 在一个实施例中，本无线蜂窝设备包括用于投射具有已知空间特征的结构化光的图案的照明器，以及用于捕获要估计音量的对象的图像的照相机。 相机对结构光的投影图案的波长范围敏感。 通过将投影图案从物体的表面反射出来引入空间失真。 以及处理器执行机器可读程序指令，用于执行以下方法：从所述摄像机接收所述对象的图像; 处理图像以生成深度图; 并从深度图估计对象的体积。 还提供了一种使用本无线蜂窝设备的方法。
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