公开(公告)号：US09778363B2

公开(公告)日：2017-10-03

申请号：US14523708

申请日：2014-10-24

申请人： Achuta Kadambi ,  Refael Whyte ,  Ayush Bhandari ,  Lee Streeter ,  Christopher Barsi ,  Adrian Dorrington ,  Ramesh Raskar

发明人： Achuta Kadambi ,  Refael Whyte ,  Ayush Bhandari ,  Lee Streeter ,  Christopher Barsi ,  Adrian Dorrington ,  Ramesh Raskar

IPC分类号： G01S17/89 ,  G01S17/32 ,  G01S7/491

CPC分类号： G01S17/89 ,  G01S7/4915 ,  G01S17/32

摘要： In illustrative implementations, a time-of-flight camera robustly measures scene depths, despite multipath interference. The camera emits amplitude modulated light. An FPGA sends at least two electrical signals, the first being to control modulation of radiant power of a light source and the second being a reference signal to control modulation of pixel gain in a light sensor. These signals are identical, except for time delays. These signals comprise binary codes that are m-sequences or other broadband codes. The correlation waveform is not sinusoidal. During measurements, only one fundamental modulation frequency is used. One or more computer processors solve a linear system by deconvolution, in order to recover an environmental function. Sparse deconvolution is used if the scene has only a few objects at a finite depth. Another algorithm, such as Wiener deconvolution, is used is the scene has global illumination or a scattering media.

公开(公告)号：US20150120241A1

公开(公告)日：2015-04-30

申请号：US14523708

申请日：2014-10-24

申请人： Achuta Kadambi ,  Refael Whyte ,  Ayush Bhandari ,  Lee Streeter ,  Christopher Barsi ,  Adrian Dorrington ,  Ramesh Raskar

发明人： Achuta Kadambi ,  Refael Whyte ,  Ayush Bhandari ,  Lee Streeter ,  Christopher Barsi ,  Adrian Dorrington ,  Ramesh Raskar

IPC分类号： G01S17/89

CPC分类号： G01S17/89 ,  G01S7/4915 ,  G01S17/32

摘要： In illustrative implementations, a time-of-flight camera robustly measures scene depths, despite multipath interference. The camera emits amplitude modulated light. An FPGA sends at least two electrical signals, the first being to control modulation of radiant power of a light source and the second being a reference signal to control modulation of pixel gain in a light sensor. These signals are identical, except for time delays. These signals comprise binary codes that are m-sequences or other broadband codes. The correlation waveform is not sinusoidal. During measurements, only one fundamental modulation frequency is used. One or more computer processors solve a linear system by deconvolution, in order to recover an environmental function. Sparse deconvolution is used if the scene has only a few objects at a finite depth. Another algorithm, such as Wiener deconvolution, is used is the scene has global illumination or a scattering media.

摘要翻译： 在说明性实现中，尽管多路径干扰，飞行时间相机鲁棒地测量场景深度。 相机发射调幅光。 FPGA发送至少两个电信号，首先是控制光源的辐射功率的调制，第二个是参考信号，以控制光传感器中像素增益的调制。 这些信号是相同的，除了时间延迟。 这些信号包括作为m序列或其他宽带码的二进制码。 相关波形不是正弦波。 在测量期间，仅使用一个基本调制频率。 一个或多个计算机处理器通过去卷积解决线性系统，以便恢复环境功能。 如果场景在有限深度只有几个对象，则使用稀疏去卷积。 使用另一种算法，如Wiener去卷积，场景有全局照明或散射介质。