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Automatic spreader-container alignment system using infrared structured lights.

Yu Liu1, Yibo Wang, Jimin Lv

  • 1College of Information System and Management, National University of Defense Technology, Changsha, Hunan, 410073, China. yu.liu@ieee.org

Applied Optics
|June 15, 2012
PubMed
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This study introduces a computer-vision system for automated spreader alignment in reach stackers. It achieves high accuracy in all weather conditions by analyzing container top infrared lines and considering spreader inclination.

Area of Science:

  • Computer Vision
  • Robotics
  • Automation Systems

Background:

  • Reach stackers are crucial in logistics for container handling.
  • Manual alignment of spreaders can be time-consuming and prone to errors.
  • Automated alignment systems are needed to improve efficiency and safety.

Purpose of the Study:

  • To develop a computer-vision system for automatic spreader alignment with target containers.
  • To enhance the accuracy and all-weather operability of reach stacker operations.
  • To reduce estimation errors in relative positioning for improved container handling.

Main Methods:

  • Utilizing infrared lines on container tops for position analysis.
  • Employing invisible structured lights for all-weather operational capability.

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  • Incorporating lateral inclination of the spreader into the alignment calculations.
  • Applying power series and linear regression for error reduction.

    • Main Results:

    • The system accurately calculates the relative position between the spreader and container.
    • All-weather operation is achieved, unaffected by shadows or climate variations.
    • Lateral inclination compensation leads to superior alignment accuracy compared to existing systems.
    • Estimation errors are significantly reduced, meeting operational requirements.

    Conclusions:

    • The developed computer-vision system effectively automates spreader alignment for reach stackers.
    • The system demonstrates robust performance across various environmental conditions.
    • Achieved accuracy within 2 cm or 2 deg fulfills operational demands for efficient container handling.