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Related Concept Videos

Distance Measurements by Taping01:18

Distance Measurements by Taping

Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...

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Related Experiment Video

Updated: Jun 12, 2026

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
10:28

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

Published on: July 5, 2016

Video metrology using a single camera.

Feng Guo1, Rama Chellappa

  • 1Objectvideo, Inc., Virginia, USA. fguo@umiacs.umd.edu

IEEE Transactions on Pattern Analysis and Machine Intelligence
|May 22, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a novel video metrology method for accurate length measurement using an uncalibrated camera. The approach effectively measures vehicle wheelbases, enabling size classification even in noisy conditions.

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Area of Science:

  • Computer Vision
  • Metrology
  • Robotics

Background:

  • Accurate length measurement from video is challenging, especially with uncalibrated cameras and noisy data.
  • Existing single-image techniques often lack the required precision for real-world applications.

Purpose of the Study:

  • To develop a robust video metrology approach for precise length measurement using an uncalibrated camera.
  • To enable automated, real-time measurement of vehicle wheelbases for size classification.

Main Methods:

  • Utilizes vanishing line information to align line segments on the reference plane.
  • Employs fitting multiple concentric circles on the image plane for enhanced accuracy.
  • Estimates the vanishing line using invariant lengths across multiple frames, adaptable to stationary and planar camera motion.

Main Results:

  • A fully automated, real-time system for measuring vehicle wheelbases was successfully developed.
  • The method demonstrates high accuracy, sufficient for classifying moving vehicles by size.
  • The approach is robust in noisy environments and adaptable to different camera movements.

Conclusions:

  • The proposed video metrology technique offers a significant advancement in accurate, uncalibrated length measurement.
  • This method provides a practical solution for automated vehicle dimension analysis and classification.
  • The algorithm's adaptability to camera motion and noisy data broadens its applicability in computer vision tasks.