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    Methods and apparatus for estimation of motion and size of non-line-of-sight objects
    2.
    发明申请
    Methods and apparatus for estimation of motion and size of non-line-of-sight objects 有权
    用于估计非视距物体的运动和尺寸的方法和装置

    公开(公告)号：US20120300062A1

    公开(公告)日：2012-11-29

    申请号：US13479185

    申请日：2012-05-23

    Applicant: Rohit Pandharkar ,  Andreas Velten ,  Ramesh Raskar

    Inventor： Rohit Pandharkar ,  Andreas Velten ,  Ramesh Raskar

    IPC: H04N7/18

    CPC classification number: G01S17/58 ,  G01S17/89

    Abstract: In exemplary implementations of this invention, a time of flight camera (ToF camera) can estimate the location, motion and size of a hidden moving object, even though (a) the hidden object cannot be seen directly (or through mirrors) from the vantage point of the ToF camera (including the camera's illumination source and sensor), and (b) the object is in a visually cluttered environment. The hidden object is a NLOS (non-line-of-sight) object. The time of flight camera comprises a streak camera and a laser. In these exemplary implementations, the motion and absolute locations of NLOS moving objects in cluttered environments can be estimated through tertiary reflections of pulsed illumination, using relative time differences of arrival at an array of receivers. Also, the size of NLOS moving objects can be estimated by backprojecting extremas of NLOS moving object time responses.

    Abstract translation: 在本发明的示例性实施方式中，飞行时间相机（ToF相机）可以估计隐藏的移动物体的位置，运动和尺寸，即使（a）从有利位置看不到直接（或通过反射镜）隐藏的物体 ToF相机（包括相机的照明源和传感器）的点，（b）物体在视觉上混乱的环境中。 隐藏的对象是一个NLOS（非视距）对象。 飞行时间相机包括条纹相机和激光。 在这些示例性实施方案中，可以使用到达接收器阵列的相对时间差，通过脉冲照明的三次反射来估计NLOS移动物体在杂乱环境中的运动和绝对位置。 此外，NLOS移动对象的大小可以通过反向投影NLOS移动对象时间响应的极值来估计。

    Methods and apparatus for estimation of motion and size of non-line-of-sight objects
    4.
    发明授权
    Methods and apparatus for estimation of motion and size of non-line-of-sight objects 有权
    用于估计非视距物体的运动和尺寸的方法和装置

    公开(公告)号：US09146317B2

    公开(公告)日：2015-09-29

    申请号：US13479185

    申请日：2012-05-23

    Applicant: Rohit Pandharkar ,  Andreas Velten ,  Ramesh Raskar

    Inventor： Rohit Pandharkar ,  Andreas Velten ,  Ramesh Raskar

    IPC: G01S17/58 ,  G01S17/89

    CPC classification number: G01S17/58 ,  G01S17/89

    Abstract: In exemplary implementations of this invention, a time of flight camera (ToF camera) can estimate the location, motion and size of a hidden moving object, even though (a) the hidden object cannot be seen directly (or through mirrors) from the vantage point of the ToF camera (including the camera's illumination source and sensor), and (b) the object is in a visually cluttered environment. The hidden object is a NLOS (non-line-of-sight) object. The time of flight camera comprises a streak camera and a laser. In these exemplary implementations, the motion and absolute locations of NLOS moving objects in cluttered environments can be estimated through tertiary reflections of pulsed illumination, using relative time differences of arrival at an array of receivers. Also, the size of NLOS moving objects can be estimated by backprojecting extremas of NLOS moving object time responses.

    Abstract translation: 在本发明的示例性实施方式中，飞行时间相机（ToF相机）可以估计隐藏的移动物体的位置，运动和尺寸，即使（a）从有利位置看不到直接（或通过反射镜）隐藏的物体 ToF相机（包括相机的照明源和传感器）的点，（b）物体在视觉上混乱的环境中。 隐藏的对象是一个NLOS（非视距）对象。 飞行时间相机包括条纹相机和激光。 在这些示例性实施方案中，可以使用到达接收器阵列的相对时间差异，通过脉冲照明的三次反射来估计NLOS移动物体在杂乱环境中的运动和绝对位置。 此外，NLOS移动对象的大小可以通过反向投影NLOS移动对象时间响应的极值来估计。

    Methods and apparatus for ultra-fast camera
    6.
    发明授权
    Methods and apparatus for ultra-fast camera 有权
    超快照相机的方法和装置

    公开(公告)号：US09081262B2

    公开(公告)日：2015-07-14

    申请号：US13646719

    申请日：2012-10-07

    Applicant: Ramesh Raskar ,  Andreas Velten

    Inventor： Ramesh Raskar ,  Andreas Velten

    IPC: G03B17/17 ,  G03B15/00 ,  G03B39/00 ,  H04N5/225

    CPC classification number: G03B17/17 ,  G03B15/00 ,  G03B39/005 ,  H04N5/225 ,  H04N5/2251

    Abstract: In exemplary implementations of this invention, a set of two scanning mirrors scans the one dimensional field of view of a streak camera across a scene. The mirrors are continuously moving while the camera takes streak images. Alternately, the mirrors may only between image captures. An illumination source or other captured event is synchronized with the camera so that for every streak image the scene looks different. The scanning assures that different parts of the scene are captured.

    Abstract translation: 在本发明的示例性实施方案中，一组两个扫描反射镜在场景上扫描条纹相机的一维视场。 镜头连续移动，而相机拍摄条纹图像。 或者，镜子只能在图像捕捉之间。 照明源或其他捕获的事件与相机同步，使得对于每个条纹图像，场景看起来不同。 扫描确保捕获场景的不同部分。

    Methods and apparatus for ultra-fast camera
    7.
    发明申请
    Methods and apparatus for ultra-fast camera 有权

    公开(公告)号：US20130100339A1

    公开(公告)日：2013-04-25

    申请号：US13646719

    申请日：2012-10-07

    Applicant: Ramesh Raskar ,  Andreas Velten

    Inventor： Ramesh Raskar ,  Andreas Velten

    IPC: G03B17/17

    CPC classification number: G03B17/17 ,  G03B15/00 ,  G03B39/005 ,  H04N5/225 ,  H04N5/2251

    Abstract: In exemplary implementations of this invention, a set of two scanning mirrors scans the one dimensional field of view of a streak camera across a scene. The mirrors are continuously moving while the camera takes streak images. Alternately, the mirrors may only between image captures. An illumination source or other captured event is synchronized with the camera so that for every streak image the scene looks different. The scanning assures that different parts of the scene are captured.

    Methods and apparatus for demultiplexing illumination
    9.
    发明授权
    Methods and apparatus for demultiplexing illumination 有权
    用于解复用照明的方法和装置

    公开(公告)号：US09451141B2

    公开(公告)日：2016-09-20

    申请号：US14690159

    申请日：2015-04-17

    Applicant: Achuta Kadambi ,  Ayush Bhandari ,  Ramesh Raskar

    Inventor： Achuta Kadambi ,  Ayush Bhandari ,  Ramesh Raskar

    IPC: H04N5/225 ,  H04N5/222 ,  G01S17/89 ,  G01S7/481

    CPC classification number: H04N5/2256 ,  G01S7/4815 ,  G01S17/89 ,  G06T2207/10028 ,  H04N5/2226

    Abstract: In illustrative implementations of this invention, an imaging system includes multiple light sources that illuminate a scene, and also includes a lock-in time of flight camera. While the scene is illuminated by these light sources, each of the light sources is amplitude-modulated by a different modulation pattern, and a reference signal is applied to the lock-in time-of-flight camera. The modulation patterns and the reference signal are carefully chosen such that the imaging system is able to disentangle, in real time, the respective contributions of the different light sources, and to compute, in real-time, depth of the scene. In some cases, the modulation signals for the light sources are orthogonal to each other and the reference signal is broadband. In some cases, the modulation codes for the light sources and the reference code are optimal codes that are determined by an optimization algorithm.

    Abstract translation: 在本发明的说明性实现中，成像系统包括照亮场景的多个光源，并且还包括飞行时间相机的锁定时间。 当这些光源照亮场景时，每个光源被不同的调制模式进行幅度调制，并且将参考信号应用于锁定飞行时间相机。 仔细选择调制图案和参考信号，使得成像系统能够实时地解析不同光源的相应贡献，并且实时地计算场景的深度。 在某些情况下，光源的调制信号彼此正交，参考信号是宽带的。 在某些情况下，光源的调制码和参考码是由优化算法确定的最佳码。

    Methods and apparatus for light field photography
    10.
    发明授权
    Methods and apparatus for light field photography 有权
    光场摄影的方法和装置

    公开(公告)号：US09380221B2

    公开(公告)日：2016-06-28

    申请号：US14192800

    申请日：2014-02-27

    Applicant: Kshitij Marwah ,  Gordon Wetzstein ,  Ramesh Raskar

    Inventor： Kshitij Marwah ,  Gordon Wetzstein ,  Ramesh Raskar

    IPC: H04N5/225 ,  H04N5/228 ,  G02B26/00 ,  H04N5/262

    CPC classification number: H04N5/2621 ,  H04N5/2254

    Abstract: In exemplary implementations of this invention, a light field camera uses a light field dictionary to reconstruct a 4D light field from a single photograph. The light field includes both angular and spatial information and has a spatial resolution equal to the spatial resolution of the imaging sensor. Light from a scene passes through a coded spatial light modulator (SLM) before reaching an imaging sensor. Computer processors reconstruct a light field. This reconstruction includes computing a sparse or compressible coefficient vector using a light field dictionary matrix. Each column vector of the dictionary matrix is a light field atom. These light field atoms each, respectively, comprise information about a small 4D region of a light field. Reconstruction quality may be improved by using an SLM that is as orthogonal as possible to the dictionary.

    Abstract translation: 在本发明的示例性实施方案中，光场照相机使用光场辞典从单张照片重建4D光场。 光场包括角度和空间信息，并且具有等于成像传感器的空间分辨率的空间分辨率。 来自场景的光在到达成像传感器之前通过编码的空间光调制器（SLM）。 计算机处理器重建光场。 该重建包括使用光场字典矩阵来计算稀疏或可压缩的系数向量。 字典矩阵的每个列向量都是一个光场原子。 这些光场原子各自分别包括关于光场的小4D区域的信息。 可以通过使用与字典尽可能正交的SLM来改善重建质量。

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