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

Method and system for multi-phase dynamic calibration of three-dimensional (3d) sensors in a time-of-flight system

一种飞行时间、相位的技术，应用在数据校准技术领域，达到增加存储开销、减小残余偏移误差、增强性能的效果

Active Publication Date: 2012-02-08
MICROSOFT TECH LICENSING LLC
View PDF7 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the emitted light energy waveform as a square wave advantageously improves the modulation contrast, but the fast rise and fall times that characterize the square wave lead to undesired higher order harmonics

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
  • Method and system for multi-phase dynamic calibration of three-dimensional (3d) sensors in a time-of-flight system
  • Method and system for multi-phase dynamic calibration of three-dimensional (3d) sensors in a time-of-flight system
  • Method and system for multi-phase dynamic calibration of three-dimensional (3d) sensors in a time-of-flight system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] As shown, obtaining reliable and accurate depth Z data from a TOF system requires the calibration characteristics of the TOF system to be known during runtime operation of the system. Certain TOF characteristics can be obtained a priori using so-called "by-example" calibration techniques. US Patent No. 7,719,662 describes an improved calibration method during which the target object is held stationary and the phase is injected into the modulation frequency of the emitted optical energy to simulate the distance-induced phase. Such calibration was fast and did not require a large space for acquiring data. Calibration models that include electrical (phase versus distance characteristics that depend on the electrical rather than geometric characteristics of the sensing system) and elliptical (phase versus distance characteristics that depend on the geometry of the sensing system rather than electrical characteristics) constructed and stored.

[0050]However, TOF character...

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

A phase-based TOF system preferably generates an optical waveform with fast rise and fall times, to enhance modulation contrast, notwithstanding there will be many high order harmonics. The system is preferably operated with an odd number of phases, to reduce system bias error due to the higher order harmonics, while maintaining good modulation contrast, without unduly increasing system memory requirements. Preferably the system can dynamically calibrate (and compensate for) higher order harmonics in the TOF generated optical energy waveform, over time and temperature. Within the optical energy transmission channel, or within the optical energy detection channel, detection amplifier gain may be modified, and / or detector signal integration time may be varied, and / or digital values may be employed to implement calibration and error reduction The resultant TOF system can operate with improved phase-vs-distance characteristics, with reduced calibration requirements.

Description

[0001] Relationship to Co-Pending Application [0002] Claimed priority from Serial No. 61 / 365,284, filed July 16, 2010, entitled "Method and System for Multi-Phase Dynamic Calibration of Three-Dimensional (3D) Sensors in a Time-of-Flight System (in Method and System for Multi-Phase Dynamic Calibration of a Three-Dimensional (3D) Sensor in a Time-of-Flight System)", which was originally assigned to Canesta Corporation of Sunnyview, CA and is now Assigned to Microsoft Corporation of Redmond, Washington. technical field [0003] The invention relates to communication technology, in particular to data calibration technology in time-of-flight system. Background technique [0004] Three-dimensional (3D) cameras based on time-of-flight (TOF) principles obtain distance information from objects in the imaged scene. Distance information is generated independently at each pixel of the camera's sensor array. Such exemplary systems are described in U.S. Patent No. 6,323,942 "CMOS-Co...

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 Applications(China)
IPC IPC(8): G01S7/497G01S17/894
CPCG01S7/497G01S17/894
Inventor Z·徐T·佩里G·希尔斯
Owner MICROSOFT TECH LICENSING LLC