公开(公告)号：US20140355820A1

公开(公告)日：2014-12-04

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: 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：US20140368639A1

公开(公告)日：2014-12-18

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

IPC: G01B11/02

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。

公开(公告)号：US20140221845A1

公开(公告)日：2014-08-07

申请号：US14245405

申请日：2014-04-04

Applicant: Xerox Corporation

Inventor： Lalit Keshav MESTHA ,  Beilei XU ,  Paul R. AUSTIN

IPC: A61B5/024 ,  A61B5/00

CPC classification number: A61B5/742 ,  A61B5/0044 ,  A61B5/02416 ,  A61B5/0452 ,  A61B5/7282

Abstract: What is disclosed is a system and method for processing a time-series signal generated by video images captured of a subject of interest in a non-contact, remote sensing environment such that the existence of a cardiac arrhythmia can be determined for that subject. In one embodiment, a time-series signal generated is received. The time-series signal was generated from video images captured of a region of exposed skin where photoplethysmographic (PPG) signals of a subject of interest can be registered. Signal separation is performed on the time-series signal to extract a photoplethysmographic signal for the subject. Peak-to-peak pulse points are detected in the PPG signal using an adaptive threshold technique with successive thresholds being based on variations detected in previous magnitudes of the pulse peaks. The pulse points are then analyzed to obtain peak-to-peak pulse dynamics. The existence of cardiac arrhythmias is determined for the subject based on the pulse dynamics.

Abstract translation: 所公开的是用于处理由非接触式遥感环境中感兴趣的对象捕获的视频图像产生的时间序列信号的系统和方法，使得可以确定该对象的心律失常的存在。 在一个实施例中，接收所产生的时间序列信号。 时间序列信号是从拍摄感兴趣的受试者的光学体积描记（PPG）信号可以被登记的暴露皮肤区域的视频图像产生的。 对时间序列信号执行信号分离，以提取对象的光电体积描记信号。 使用自适应阈值技术在PPG信号中检测峰峰值脉冲点，其中连续阈值基于在脉冲峰值的先前幅度中检测到的变化。 然后分析脉冲点以获得峰 - 峰脉冲动态。 基于脉搏动力学确定对象的心律失常的存在。