公开(公告)号：US09025883B2

公开(公告)日：2015-05-05

申请号：US14085143

申请日：2013-11-20

Applicant: Xerox Corporation

Inventor： Edgar A. Bernal ,  Xuejin Wen ,  Wencheng Wu ,  Lalit Keshav Mestha

IPC: G06K9/46 ,  G06T11/00 ,  G06K9/32

CPC classification number: G06T11/003 ,  G06K9/2054 ,  G06K9/209 ,  G06K9/3233 ,  G06K9/6249 ,  H03M7/3062 ,  H04N19/60

Abstract: What is disclosed is a system and method which reconstructs an N-pixel image of a scene such that Q pixel locations associated with identified regions of interest in a scene have a higher image quality when rendered relative to other pixels in the image. Acquisition and adaptive-quality compression are performed simultaneously by semi-synchronously or asynchronously temporally modulating an ordered set of sampling functions used to spatially modulate a pattern of light. The teachings hereof improve compression efficiency of a compressed sensing framework while improving encoding efficiency with respect to traditional compressed sensing techniques.

Abstract translation: 所公开的是一种重建场景的N像素图像的系统和方法，使得当相对于图像中的其他像素渲染时，与场景中的识别的感兴趣区域相关联的Q个像素位置具有较高的图像质量。 通过半同步或异步时间调制用于空间调制光模式的有序集合采样功能同时执行采集和自适应质量压缩。 本发明的教导提高了压缩感测框架的压缩效率，同时提高了传统压缩感测技术的编码效率。

公开(公告)号：US08995754B2

公开(公告)日：2015-03-31

申请号：US13905788

申请日：2013-05-30

Applicant: Xerox Corporation

Inventor： Wencheng Wu ,  Edgar A. Bernal ,  Lalit Keshav Mestha ,  Paul R. Austin

IPC: G06K9/00 ,  G06T7/00

CPC classification number: G06T7/004 ,  G06T7/75 ,  G06T2207/30244

Abstract: What is disclosed a system and method for estimating a position (or pose) of a camera relative to a surface upon which an object rests in an image captured by that camera such that a volume can be estimated for that object. In one embodiment, a matrix K is determined from parameters intrinsic to a camera used to capture image. An amount of a camera translation T is determined with respect to a set of real-world coordinates in (X,Y,Z). An amount of a camera rotation matrix R is determined from camera angles measured with respect to the real-world coordinates. A distance Zc of the camera at location (i,j) can then be estimated. A volume of the object in an image of that object can be estimated from the camera pose.

Abstract translation: 公开了一种用于估计相机相对于表面的位置（或姿态）的系统和方法，在该表面上物体停留在由该相机拍摄的图像中，使得可以为该对象估计音量。 在一个实施例中，矩阵K由用于捕获图像的相机固有的参数确定。 相对于（X，Y，Z）中的一组真实世界坐标来确定相机平移度T的量。 从相对于真实世界坐标测量的相机角度确定相机旋转矩阵R的量。 然后可以估计位置（i，j）处的摄像机的距离Zc。 可以从相机姿态估计该物体的图像中的物体的体积。

公开(公告)号：US08934155B2

公开(公告)日：2015-01-13

申请号：US13781806

申请日：2013-03-01

Applicant: Xerox Corporation

Inventor： Lalit Keshav Mestha ,  Yao Rong Wang

IPC: H04N1/60 ,  G06K15/02

CPC classification number: G06K15/1802 ,  H04N1/6052 ,  H04N1/6061

Abstract: A color management system includes an input device, an input processor, and a plurality of print engines. The input processor is configured to transform, using an input transformation stored on the input device, the digital image in an input source color space to a digital image in a standardized multi-color color space. A print engine processor of the print engine is configured to receive the digital image in the standardized multi-color color space from the input processor and transform, using a print engine transformation stored on the print engine, the digital image in the standardized multi-color color space to a digital image in a print engine multi-color color space. The input transformation includes a color gamut coverage at least equal to color gamut coverage of all the print engines in the color management system.

Abstract translation: 颜色管理系统包括输入设备，输入处理器和多个打印引擎。 输入处理器被配置为使用存储在输入设备上的输入变换将输入源颜色空间中的数字图像转换为标准化多色颜色空间中的数字图像。 打印引擎的打印引擎处理器被配置为从输入处理器接收标准化的多色颜色空间中的数字图像，并使用存储在打印引擎上的打印引擎转换，以标准化多色的数字图像 彩色空间到打印引擎多色彩色空间中的数字图像。 输入变换包括至少等于颜色管理系统中所有打印引擎的色域覆盖的色域覆盖。

公开(公告)号：US20130265598A1

公开(公告)日：2013-10-10

申请号：US13897781

申请日：2013-05-20

Applicant: Xerox Corporation

Inventor： Patricia Joanne Donaldson ,  Lalit Keshav Mestha ,  Tonya L. Love ,  Ta-Chen Hsu

IPC: H04N1/60

CPC classification number: H04N1/6027 ,  H04N1/6033 ,  H04N1/6077

Abstract: A printing system and associated method is provided which is capable of operating in a standard output color gamut mode and/or a non-standard output color gamut mode. According to an exemplary method, the printing system non-standard output color gamut mode is associated with an off-gray balance calibration to extend the gamut of the printing system to include colors outside the gamut associated with the standard output color gamut mode.

Abstract translation: 提供能够以标准输出色域模式和/或非标准输出色域模式操作的打印系统和相关方法。 根据示例性方法，打印系统非标准输出色域模式与灰度均衡校准相关联，以将打印系统的色域扩展为包括与标准输出色域模式相关联的色域外的颜色。

公开(公告)号：US09662022B2

公开(公告)日：2017-05-30

申请号：US13871766

申请日：2013-04-26

Applicant: Xerox Corporation

Inventor： Survi Kyal ,  Lalit Keshav Mestha ,  Beilei Xu

IPC: A61B5/024 ,  A61B5/00 ,  A61B5/021 ,  A61B5/0295

CPC classification number: A61B5/02405 ,  A61B5/021 ,  A61B5/02416 ,  A61B5/02444 ,  A61B5/0295 ,  A61B5/7225

Abstract: What is disclosed is a system and method for extracting photoplethysmographic (PPG) signal (i.e., a cardiac signal) on a continuous basis from a time-series signals obtained from video images captured of a subject being monitored for cardiac function in a non-contact remote sensing environment involves the following. First, a time-series signal obtained from video images captured of a region of exposed skin where a photoplethysmographic (PPG) signal of a subject of interest can be registered. A sliding window is then used to define consecutive sequential segments of the time-series signal for processing. Each of the consecutive time-series signal segments is detrended such that low frequency variations and non-stationary components are removed. The detrended signals are processed to obtain, for each segment, a PPG signal. The PPG signal segments are then stitched together using a stitching method, as disclosed herein, to obtain a continuous PPG signal for the subject.

公开(公告)号：US09443289B2

公开(公告)日：2016-09-13

申请号：US13923612

申请日：2013-06-21

Applicant: Xerox Corporation

Inventor： Beilei Xu ,  Lalit Keshav Mestha ,  Survi Kyal ,  Himanshu J. Madhu

IPC: G06K9/00 ,  G06T5/00 ,  G06T5/50 ,  G06T7/00

CPC classification number: G06T5/003 ,  G06T5/50 ,  G06T7/0016 ,  G06T2207/10016 ,  G06T2207/20201 ,  G06T2207/30088

Abstract: What is disclosed is a system for compensating for motion induced artifacts in a physiological signal obtained from multiple videos of a first and second region of interest a subject being monitored for a desired physiological function. At least one of the videos being of the first region and at least one of the videos being of the second region. The first region being at least one area of exposed skin where a desired signal corresponding to the physiological function can be registered by a video imaging device. The second region being an area where a movement by the subject is likely to induce motion artifacts into the signal. The videos are processed to isolate pixels associated with the first and second regions. Processed pixels of the isolated first regions to obtain a composite time-series signal. From the composite signal, a physiological signal corresponding to the physiological function is extracted.

Abstract translation: 所公开的是一种用于补偿从受感染的第一和第二感兴趣区域的多个视频获得的生理信号中的运动诱发伪影的系统，该对象被监视为期望的生理功能。 至少一个视频是第一区域，并且至少一个视频是第二区域。 第一区域是暴露皮肤的至少一个区域，其中对应于生理功能的期望信号可由视频成像装置登记。 第二区域是被摄体的移动可能引起运动伪像进入信号的区域。 处理视频以分离与第一和第二区域相关联的像素。 隔离的第一区域的处理像素以获得复合时间序列信号。 从复合信号中提取与生理功能对应的生理信号。

公开(公告)号：US09036877B2

公开(公告)日：2015-05-19

申请号：US13871728

申请日：2013-04-26

Applicant: Xerox Corporation

Inventor： Survi Kyal ,  Lalit Keshav Mestha ,  Beilei Xu

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

CPC classification number: A61B5/7225 ,  A61B5/0013 ,  A61B5/0077 ,  A61B5/02416 ,  A61B5/7203 ,  A61B5/7278 ,  G06F19/00 ,  G06K9/00496 ,  G06T7/0016 ,  G06T2207/30004 ,  G06T2207/30076 ,  G16H40/67

Abstract: What is disclosed is a novel system and method for extracting photoplethysmographic (PPG) signals (i.e., cardiac signals) on a continuous basis from signals generated from video images captured of a subject being monitored for cardiac function in a non-contact remote sensing environment. In one embodiment, a time-series signal is received. The time-series signal is generated from video images captured of a region of exposed skin where a PPG signal of a subject of interest can be registered. The time-series signal is then divided into batches for processing, with successive batches having at least a 95% overlap with a previous batch. Each of the batches of time-series signals is processed to obtain a PPG signal from each batch. A mid-point of each of these PPG-signals is stitched together to obtain a continuous PPG signal for the subject. The continuous PPG signal for the subject can then viewed on a display device.

Abstract translation: 所公开的是一种用于从非接触式遥感环境中心脏功能监测对象被捕获的视频图像产生的信号连续提取光电体积描记术（PPG）信号（即心脏信号）的新型系统和方法。 在一个实施例中，接收时间序列信号。 时间序列信号是从可以登记感兴趣对象的PPG信号的暴露皮肤区域拍摄的视频图像产生的。 然后将时间序列信号分成批次进行处理，其中连续批次与先前批次具有至少95％的重叠。 处理每批批次的时间序列信号以从每个批次获得PPG信号。 将这些PPG信号的每一个的中点缝合在一起以获得对象的连续的PPG信号。 然后可以在显示设备上观看被摄体的连续PPG信号。

公开(公告)号：US08879867B2

公开(公告)日：2014-11-04

申请号：US13745283

申请日：2013-01-18

Applicant: Xerox Corporation

Inventor： Takashi Tanaka ,  Lalit Keshav Mestha

IPC: G06K9/40 ,  G06T5/00

CPC classification number: G06T5/007 ,  G01J3/0248 ,  G01J3/0264 ,  G01J2003/2826 ,  G06T2207/10016 ,  G06T2207/10024 ,  G06T2207/30004

Abstract: What is disclosed is a system and method for real-time enhancement of an identified time-series signal of interest in a video that has a similar spatial and temporal structure to a given reference signal, as determined by a measure of closeness. A closeness measure is computed for pixels of each image frame of each channel of a multi-channel video to identify a time-series signal of interest. The intensity of pixels associated with that time-series signal is modified based on a product of the closeness measure and the reference signal scaled by an amplification factor. The modified pixel intensity values are provided back into the source video to generate a reconstructed video such that, upon playback of the reconstructed video, viewers thereof can visually examine the amplified time-series signal, see how it is distributed and how it propagates. The methods disclosed find their uses in remote sensing applications such as telemedicine.

Abstract translation: 所公开的是用于实时增强视频中所识别的时间序列信号的系统和方法，该视频具有与给定参考信号相似的空间和时间结构，如由接近程度所确定的。 为多通道视频的每个通道的每个图像帧的像素计算接近度量，以识别感兴趣的时间序列信号。 与该时间序列信号相关联的像素的强度基于通过放大因子缩放的接近度测量和参考信号的乘积而被修改。 修改的像素强度值被提供回到源视频中以产生重构的视频，使得在重建视频时，其观看者可以在视觉上检查放大的时间序列信号，看看它是如何分布的以及它如何传播的。 所公开的方法可用于遥感应用，如远程医疗。

公开(公告)号：US20130128338A1

公开(公告)日：2013-05-23

申请号：US13718127

申请日：2012-12-18

Applicant: XEROX CORPORATION

Inventor： Pinyen Lin ,  Lalit Keshav Mestha ,  Peter M. Gulvin ,  Yao Rong Wang

IPC: G02B26/00

CPC classification number: G02B26/001 ,  G01J3/26

Abstract: A method of forming a tunable Fabry-Perot filter includes forming a first reflective layer on a surface of a substrate, forming a sacrificial layer over the first reflective layer, forming a second reflective layer over the sacrificial layer, defining vias through the sacrificial layer, forming a support body over the sacrificial layer which extends into the vias and removing the sacrificial layer to define a gap intermediate the first and second reflective layers.

Abstract translation: 形成可调谐法布里 - 珀罗滤光器的方法包括在衬底的表面上形成第一反射层，在第一反射层上形成牺牲层，在牺牲层上形成第二反射层，限定穿过牺牲层的通孔， 在所述牺牲层上形成支撑体，所述牺牲层延伸到所述通孔中并移除所述牺牲层以限定所述第一和第二反射层之间的间隙。

公开(公告)号：US09697599B2

公开(公告)日：2017-07-04

申请号：US14742233

申请日：2015-06-17

Applicant: Xerox Corporation

Inventor： Prathosh A. Prasad ,  Lalit Keshav Mestha ,  Himanshu J. Madhu

IPC: G06T7/00 ,  A61B5/08 ,  A61B5/11 ,  A61B5/113 ,  A61B5/00 ,  G06K9/48 ,  G06K9/62 ,  G06K9/20 ,  G06T5/20 ,  G06T5/00

CPC classification number: G06T7/0012 ,  A61B5/0013 ,  A61B5/0816 ,  A61B5/0826 ,  A61B5/1128 ,  A61B5/1135 ,  A61B5/4818 ,  A61B5/746 ,  G06K9/00362 ,  G06K9/2054 ,  G06K9/481 ,  G06K9/6223 ,  G06T5/002 ,  G06T5/20 ,  G06T5/50 ,  G06T7/0016 ,  G06T2207/10016 ,  G06T2207/30061 ,  G06T2207/30076

Abstract: What is disclosed is a system and method for determining a subject's respiratory pattern from a video of that subject. One embodiment involves receiving a video comprising N≧2 time-sequential image frames of a region of interest (ROI) of a subject where a signal corresponding to the subject's respiratory function can be registered by at least one imaging channel of a video imaging device. The ROI comprises P pixels. Time-series signals of duration N are generated from pixels isolated in the ROI. Features are extracted from the time-series signals and formed into P-number of M-dimensional vectors. The feature vectors are clustered into K clusters. The time-series signals corresponding to pixels represented by the feature vectors in each cluster are averaged along a temporal direction to obtain a representative signal for each cluster. One of the clusters is selected. A respiratory pattern is determined for the subject based on the representative signal.