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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

Improved measurement linearity and precision for AMCW time-of-flight range imaging cameras.

Andrew D Payne¹, Adrian A Dorrington, Michael J Cree

¹School of Engineering, University of Waikato, Private Bag 3105, Hamilton, New Zealand. a.payne@waikato.ac.nz

|August 11, 2010

Summary

This study introduces a novel phase encoding method for amplitude modulated continuous wave (AMCW) time-of-flight range imaging. The technique improves measurement linearity and precision, reducing the need for system calibration.

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Area of Science:

Optics and Photonics
Computer Vision
Metrology

Background:

Amplitude Modulated Continuous Wave (AMCW) time-of-flight (ToF) range imaging systems are susceptible to measurement nonlinearity.
This nonlinearity arises from aliased harmonics in the amplitude modulation signals, typically requiring system calibration.
Existing calibration methods can be complex and sensitive to environmental changes.

Purpose of the Study:

To develop an alternative phase encoding approach for AMCW ToF range imaging.
To improve measurement linearity and precision in raw range measurements.
To reduce or eliminate the need for system calibration and its associated complexities.

Main Methods:

Implemented a novel phase encoding strategy to attenuate harmonics during signal sampling.
Reduced the duty cycle of the amplitude modulated illumination source while maintaining overall illumination power.
Evaluated the impact of the phase encoding method on measurement linearity and precision.

Main Results:

The phase encoding approach significantly attenuated aliased harmonics, enhancing measurement linearity in raw data.
The system demonstrated improved measurement precision, particularly with a reduced illumination duty cycle.
The proposed method mitigated the necessity for traditional system response calibration.

Conclusions:

The novel phase encoding technique offers a more robust and accurate solution for AMCW ToF range imaging.
This method simplifies system deployment by reducing calibration requirements.
Enhanced linearity and precision contribute to more reliable depth measurements in optical ranging systems.