Unlock instant, AI-driven research and patent intelligence for your innovation.

Multipath interference suppression method in tof depth solution, tof depth solution method and device

A technology of multipath interference and TOF camera, which is applied in the direction of measuring devices, electromagnetic wave re-radiation, instruments, etc., can solve the problems of depth measurement results errors and achieve the effect of accurate depth measurement values

Active Publication Date: 2022-07-08
ZHEJIANG UNIV
View PDF14 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present application is to provide a method for suppressing multipath interference in TOF depth calculation, a method and device for TOF depth calculation, and to separate the direct component of the primary reflection of the scene from the indirect component caused by multipath interference to solve the problem of In the related art, the superimposition of direct reflected light and other multi-path reflected light signals leads to serious errors in depth measurement results.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multipath interference suppression method in tof depth solution, tof depth solution method and device
  • Multipath interference suppression method in tof depth solution, tof depth solution method and device
  • Multipath interference suppression method in tof depth solution, tof depth solution method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] figure 1 is a schematic diagram of multi-path reflection according to an exemplary embodiment, refer to figure 1 , use the corner model to illustrate the multi-path interference situation: the common TOF camera is to flood the scene with a light source and collect the reflected light signal by the photosensitive receiving module for depth calculation. However, the light beam 101 emitted by the light source on the scene surface After irradiation, a single reflection will generate a direct component, and it will also be irradiated and reflected by stray light (such as 102, 103) generated by other surfaces, resulting in an indirect component. The reflected light signal 104 received by the photosensitive receiving module is the direct component and the light. Superposition of indirect components. The depth value calculated from the superimposed signal will have a large deviation from the real depth value.

[0071] figure 2 is a flow chart of a method for suppressing mul...

Embodiment 2

[0128] Figure 7 is a flow chart of a TOF depth solution method shown according to an exemplary embodiment, refer to Figure 7 , an embodiment of the present invention provides a TOF depth solution method, the method may include:

[0129] Step S21, receiving a first reflected light signal reflected by a scene captured by a TOF camera, where the first reflected light signal is obtained by performing dot-matrix illumination reflection on the scene with a certain modulation frequency by the TOF camera;

[0130] Step S22, performing phase calculation on the first reflected light signal to obtain the phase of the corresponding position of the dot-matrix illumination light spot;

[0131] Step S23, receiving the second reflected light signal reflected by the scene captured by the TOF camera, where the second reflected light signal is obtained by floodlighting and reflecting the scene on the scene with two different modulation frequencies by the TOF camera;

[0132] Step S24, perfor...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for suppressing multipath interference in TOF depth calculation, a TOF depth calculation method and a device. It is obtained by reflecting the scene with lattice illumination at a certain modulation frequency; the phase of the first reflected light signal is calculated to obtain the phase of the corresponding position of the lattice illumination spot; the second reflected light signal collected by the TOF camera and reflected by the scene is received, The second reflected light signal is obtained by floodlighting the scene with two different modulation frequencies by the TOF camera; data reconstruction is performed on the second reflected light signal, and the second reflected light signal is expressed as the sum of the direct component and the indirect component and; use the phase at the corresponding position of the dot matrix illumination spot to decompose the indirect component from the second reflected light signal; perform two-dimensional interpolation on the indirect component to obtain the indirect component of the entire scene; Two reflected light signals are removed.

Description

technical field [0001] The invention relates to the technical field of 3D imaging of time-of-flight cameras, in particular to a method for suppressing multipath interference in TOF depth calculation, a TOF depth calculation method and a device. Background technique [0002] In recent years, three-dimensional imaging technology has become a hot field of research, and TOF (Time-of-Flight, time-of-flight) depth imaging technology has also developed rapidly. The TOF camera emits infrared modulated light waves to the scene under test, and uses the sensor to receive the reflected light to calculate the time of flight of the light, thereby obtaining the depth information of the scene under test. At present, the continuous wave modulation method is mostly used to record the time of flight of light by detecting the phase shift of the reflected light and the outgoing light. The working principle is simple, and it is widely used in face recognition, human-computer interaction and other...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/894G01S7/48
CPCG01S17/894G01S7/4802
Inventor 严惠民刘晓玥霍嘉燚
Owner ZHEJIANG UNIV