公开(公告)号：US09504426B2

公开(公告)日：2016-11-29

申请号：US14099358

申请日：2013-12-06

Applicant: Xerox Corporation

Inventor： Survi Kyal ,  Lalit Keshav Mestha

IPC: A61B5/00 ,  A61B5/024 ,  A61B5/113 ,  A61B5/11

CPC classification number: A61B5/7207 ,  A61B5/024 ,  A61B5/1128 ,  A61B5/1135 ,  A61B5/7203 ,  A61B5/7278 ,  A61B2576/00

Abstract: What is disclosed is a system and method for compensating for motion induced artifacts in physiological signals extracted from a video of a subject being monitored for a physiological function in a non-contact, remote sensing environment. The present method identifies a center frequency from a physiological signal obtained from processing a prior video segment. Since a moment to moment change in pulse frequency from one video segment to a next is not very large, signals obtained from sequential video segments can be repeatedly processed and an adaptive band-pass filter repeatedly re-configured and used to filter a next video segment, and so on. Using the teachings disclosed herein, a motion-compensated continuous cardiac signal can be obtained for the subject for continuous monitoring of the subject's cardiac function via video imaging. The teachings hereof provide an effective means for compensating for movement by the subject during video acquisition. Various embodiments are disclosed.

Abstract translation: 公开的是用于补偿从在非接触式遥感环境中对于生理功能进行监视的被摄体的视频提取的生理信号中的运动诱发伪影的系统和方法。 本方法根据从先前的视频段处理获得的生理信号来识别中心频率。 由于从一个视频段到下一个视频段的脉冲频率的瞬间变化不是非常大，可以重复处理从顺序视频段获得的信号，并且自适应带通滤波器被重新重新配置并用于过滤下一个视频段 ， 等等。 使用本文公开的教导，可以获得用于受试者的运动补偿的连续心脏信号，以经由视频成像连续监测受试者的心脏功能。 本发明的教导提供了一种在视频采集期间补偿受试者的运动的有效手段。 公开了各种实施例。

公开(公告)号：US09483837B2

公开(公告)日：2016-11-01

申请号：US14211455

申请日：2014-03-14

Applicant: Xerox Corporation

Inventor： Beilei Xu ,  Survi Kyal ,  Lalit Keshav Mestha ,  Graham S. Pennington

IPC: G06T7/20

CPC classification number: G06T7/20 ,  G06T2207/10016 ,  G06T2207/10024 ,  G06T2207/30076 ,  G06T2207/30088

Abstract: What is disclosed is a system and method for compensating for motion during processing of a video of a subject being monitored for physiological function assessment. In one embodiment, image frames are received. Successive batches of N video frames are processed to isolate pixels associated with a body region of the subject where a physiological signal is registered by the camera. The pixels are processed to obtain a time-series signal for each batch. A determination is made whether movement during video acquisition of this batch of image frames exceeds a threshold level. If so then a size N of the next batch of image frames is changed to: N=N+M1, where N+M1≦Nmax. Otherwise, a size N of a next batch is changed to: N=N−M2, where N−M2≧Nmin. Thereafter, processing repeats in a real-time continuous manner as the next batch of the N image frames is received. Various embodiments are disclosed.

Abstract translation: 所公开的是用于在处理被监视的受试者的视频的处理期间补偿运动以进行生理功能评估的系统和方法。 在一个实施例中，接收图像帧。 处理N个视频帧的连续批次以分离与由摄像机登记生理信号的被摄体的身体区域相关联的像素。 处理像素以获得每个批次的时间序列信号。 确定在该批次的图像帧的视频采集期间的移动是否超过阈值水平。 如果是，则下一批图像帧的大小N被改变为：N = N + M1，其中N +M1≤Nmax。 否则，下一批次的大小N变为：N = N-M2，其中N-M2≥Nmin。 此后，当接收到下一批N个图像帧时，处理以实时连续的方式重复。 公开了各种实施例。

公开(公告)号：US09351649B2

公开(公告)日：2016-05-31

申请号：US14026739

申请日：2013-09-13

Applicant: Xerox Corporation

Inventor： Lalit Keshav Mestha ,  Survi Kyal

IPC: A61B5/024 ,  A61B5/00 ,  A61B5/021 ,  G06T7/00

CPC classification number: A61B5/02427 ,  A61B5/0075 ,  A61B5/02125 ,  G06T7/0012 ,  G06T2207/30076 ,  G06T2207/30104

Abstract: What is disclosed is a system and method for determining a subject of interest's arterial pulse transit time from time-varying source signals generated from video images. In one embodiment, a video imaging system is used to capture a time-varying source signal of a proximal and distal region of a subject of interest. The image frames are processed to isolate localized areas of a proximal and distal region of exposed skin of the subject. A time-series signal for each of the proximal and distal regions is extracted from the source video images. A phase angle is computed with respect to frequency for each of the time-series signals to produce respective phase v/s frequency curves for each region. Slopes within a selected cardiac frequency range are extracted from each of the phase curves and a difference is computed between the two slopes to obtain an arterial pulse transit time for the subject.

Abstract translation: 公开的是用于从由视频图像生成的时变源信号确定感兴趣的动脉脉冲传播时间的对象的系统和方法。 在一个实施例中，使用视频成像系统来捕获感兴趣对象的近端和远端区域的时变源信号。 处理图像帧以分离受试者暴露皮肤的近端和远端区域的局部区域。 从源视频图像中提取每个近端和远端区域的时间序列信号。 相对于每个时间序列信号的频率计算相位角，以产生每个区域的相位v / s频率曲线。 从每个相位曲线提取所选择的心脏频率范围内的斜率，并且在两个斜率之间计算差以获得对象的动脉脉冲传播时间。

公开(公告)号：US09336594B2

公开(公告)日：2016-05-10

申请号：US14200759

申请日：2014-03-07

Applicant: Xerox Corporation

Inventor： Survi Kyal ,  Lalit Keshav Mestha

IPC: G06K9/00 ,  G06T7/00 ,  A61B5/00 ,  A61B5/024

CPC classification number: G06T7/0014 ,  A61B5/0077 ,  A61B5/02416 ,  A61B5/746 ,  A61B2576/00 ,  G06T7/0012 ,  G06T7/20 ,  G06T2207/10016 ,  G06T2207/10024 ,  G06T2207/30004 ,  G06T2207/30088

Abstract: What is disclosed is a system and method for estimating cardiac pulse rate from a video of a subject being monitored for cardiac function. In one embodiment, batches of overlapping image frames are continuously received and processed by isolating regions of exposed skin. Pixels of the isolated regions are processed to obtain a time-series signal per region and a physiological signal is extracted from each region's time-series signals. The physiological signal is processed to obtain a cardiac pulse rate for each region. The cardiac pulse rate for each region is compared to a last good cardiac pulse rate from a previous batch to obtain a difference. If the difference exceeds a threshold, the cardiac pulse rate is discarded. Otherwise, it is retained. Once all the regions have been processed, the retained cardiac pulse rate with a minimum difference becomes the good cardiac pulse rate for comparison on a next iteration.

Abstract translation: 所公开的是用于从被监测用于心脏功能的受试者的视频估计心脏脉搏率的系统和方法。 在一个实施例中，通过隔离暴露皮肤的区域连续地接收并处理批次的重叠图像帧。 处理孤立区域的像素以获得每个区域的时间序列信号，并且从每个区域的时间序列信号中提取生理信号。 处理生理信号以获得每个区域的心脏脉搏率。 将每个区域的心脏脉搏率与来自前一批次的最后良好的心脏脉搏率进行比较以获得差异。 如果差异超过阈值，则丢弃心脏脉搏率。 否则保留。 一旦所有区域被处理，具有最小差异的保留的心脏脉搏率就成为良好的心脏脉搏率，用于在下一次迭代中进行比较。

公开(公告)号：US09256937B2

公开(公告)日：2016-02-09

申请号：US14161023

申请日：2014-01-22

Applicant: Xerox Corporation

Inventor： Lalit Keshav Mestha ,  Beilei Xu

IPC: G06K9/00 ,  G06T7/00 ,  G01J5/10 ,  G01J5/08 ,  A61B6/00 ,  G01J5/00

CPC classification number: G06T7/0012 ,  G01J5/0025 ,  G01J5/08 ,  G01J5/10 ,  G01J5/60 ,  G01J2005/0077 ,  G01J2005/0085 ,  G06T2207/10048 ,  G06T2207/30088 ,  G06T2207/30104

Abstract: What is disclosed is a system and method for assessing peripheral vascular disease from a thermal image captured using a thermal imaging system. In one embodiment the present method involves the following. First, a thermal image is received of a region of exposed skin of a peripheral body part of a subject being monitored for PVD. The thermal image was acquired by a thermal imaging system. Pixels in the thermal image each have a corresponding temperature value. The thermal image is analyzed to stratify the peripheral body part into a plurality of skin surface regions. A skin surface temperature for each respective skin surface region is identified based on pixels in the thermal image associated with those regions. The temperatures are then extracted such that a progression of temperatures can be ascertained. A method for forecasting the progression for future times is also disclosed.

Abstract translation: 公开的是一种用于使用热成像系统捕获的热图像来评估外周血管疾病的系统和方法。 在一个实施例中，本方法涉及以下。 首先，接收被监测用于PVD的被摄体的外周身体部分的暴露皮肤的区域的热图像。 热图像由热成像系统获得。 热像中的像素都具有相应的温度值。 分析热图像以将周边主体部分分层成多个皮肤表面区域。 基于与这些区域相关联的热图像中的像素来识别每个相应皮肤表面区域的皮肤表面温度。 然后提取温度使得可以确定温度的进展。 还公开了一种预测未来时间进展的方法。

公开(公告)号：US09188785B2

公开(公告)日：2015-11-17

申请号：US13842027

申请日：2013-03-15

Applicant: Xerox Corporation

Inventor： Edgar A. Bernal ,  Lalit Keshav Mestha ,  Paul R. Austin ,  Robert Paul Loce

IPC: G02B27/10 ,  G02B27/14 ,  H04N3/08 ,  H04N9/09 ,  H04N9/10

CPC classification number: G02B27/1013 ,  G02B27/141 ,  H04N3/08 ,  H04N9/09 ,  H04N9/10

Abstract: A system is provided comprising: a light field emanating from a scene and a positive imaging lens focusing light from the light field onto a DMD array. A first collector lens directs the spatially modulated light to a first photodetector having a spectral sensitivity to a first spectral band. The first photodetector senses the directed light from the first pixel-wise multiplication and produces a signal representing a first inner product between the light incident on the DMD and the first basis function for the first spectral band. A second collector lens directs the spatially modulated light to a second photodetector having a spectral sensitivity to a second spectral band. The second photodetector senses the directed light from the first pixel-wise multiplication and produces a signal representing a first inner product between the light incident on the DMD and the first basis function for the second spectral band.

Abstract translation: 提供了一种系统，包括：从场景发出的光场和将来自光场的光聚焦到DMD阵列的正成像透镜。 第一收集透镜将空间调制的光引导到具有对第一光谱带的光谱灵敏度的第一光电检测器。 第一光电检测器感测来自第一像素乘法的定向光，并且产生表示入射在DMD上的光与第一光谱带的第一基函数之间的第一内积的信号。 第二收集透镜将空间调制的光引导到具有对第二光谱带的光谱灵敏度的第二光电检测器。 第二光电检测器感测来自第一像素乘法的定向光，并且产生表示入射在DMD上的光与第二光谱带的第一基函数之间的第一内积的信号。

公开(公告)号：US20150085136A1

公开(公告)日：2015-03-26

申请号：US14037847

申请日：2013-09-26

Applicant: Xerox Corporation

Inventor： Edgar A. Bernal ,  Lalit Keshav Mestha ,  Beilei Xu

IPC: H04N5/30 ,  H04N5/33

CPC classification number: H04N5/33 ,  A61B5/0059 ,  A61B5/02444 ,  A61B5/1455 ,  H04N5/23245 ,  H04N5/2351 ,  H04N5/332 ,  H04N5/3454 ,  H04N5/3535

Abstract: Disclosed herein is a single-pixel camera system and method for performing spot/area measurement of a localized area of interest identified in a scene and for performing spatial scene reconstruction. A switching module enables a single-pixel camera to alternate between a spot/area measurement mode and a spatial scene reconstruction mode. In the case where the operative mode is switched to spot measurement, a light modulation device is configured to modulate incoming light according to a clustered pattern that is specific to a localized area of interest intended to be measured by integrating across the pixels to generate an integral value. In the case where the operative mode is switched to spatial scene reconstruction, the light modulation device can be configured to modulate incoming light to display a spatial pattern corresponding to a set of predetermined basis functions.

Abstract translation: 本文公开了一种单像素摄像机系统和方法，用于对场景中识别的局部感兴趣区域进行点/面测量并执行空间场景重建。 开关模块使单像素摄像机能够在点/面测量模式和空间场景重建模式之间交替。 在将操作模式切换到点测量的情况下，光调制装置被配置为根据通过在像素之间进行积分而特定于要测量的局部感兴趣区域的聚类图案来调制入射光以产生积分 值。 在将操作模式切换到空间场景重建的情况下，光调制装置可以被配置为调制入射光以显示对应于一组预定基础功能的空间图案。

公开(公告)号：US20140267881A1

公开(公告)日：2014-09-18

申请号：US13842027

申请日：2013-03-15

Applicant: Xerox Corporation

Inventor： Edgar A. Bernal ,  Lalit Keshav Mestha ,  Paul R. Austin ,  Robert Paul Loce

IPC: G02B5/08

CPC classification number: G02B27/1013 ,  G02B27/141 ,  H04N3/08 ,  H04N9/09 ,  H04N9/10

Abstract: A system is provided comprising: a light field emanating from a scene and a positive imaging lens focusing light from the light field onto a DMD array. A first collector lens directs the spatially modulated light to a first photodetector having a spectral sensitivity to a first spectral band. The first photodetector senses the directed light from the first pixel-wise multiplication and produces a signal representing a first inner product between the light incident on the DMD and the first basis function for the first spectral band. A second collector lens directs the spatially modulated light to a second photodetector having a spectral sensitivity to a second spectral band. The second photodetector senses the directed light from the first pixel-wise multiplication and produces a signal representing a first inner product between the light incident on the DMD and the first basis function for the second spectral band.

Abstract translation: 提供了一种系统，包括：从场景发出的光场和将来自光场的光聚焦到DMD阵列的正成像透镜。 第一收集透镜将空间调制的光引导到具有对第一光谱带的光谱灵敏度的第一光电检测器。 第一光电检测器感测来自第一像素乘法的定向光，并且产生表示入射在DMD上的光与第一光谱带的第一基函数之间的第一内积的信号。 第二收集透镜将空间调制的光引导到具有对第二光谱带的光谱灵敏度的第二光电检测器。 第二光电检测器感测来自第一像素乘法的定向光，并且产生表示入射在DMD上的光与第二光谱带的第一基函数之间的第一内积的信号。