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Related Concept Videos

Distance Corrections01:15

Distance Corrections

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To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
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Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

Influence of Earth's Curvature and Atmospheric Refraction on Leveling

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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
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Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Calibration Curves: Linear Least Squares01:20

Calibration Curves: Linear Least Squares

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A calibration curve is a plot of the instrument's response against a series of known concentrations of a substance. This curve is used to set the instrument response levels, using the substance and its concentrations as standards. Alternatively, or additionally, an equation is fitted to the calibration curve plot and subsequently used to calculate the unknown concentrations of other samples reliably.
For data that follow a straight line, the standard method for fitting is the linear...
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Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

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When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
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Distance Measurements by Taping01:18

Distance Measurements by Taping

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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

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Robotized Testing of Camera Positions to Determine Ideal Configuration for Stereo 3D Visualization of Open-Heart Surgery
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Calibration method for large-field-of-view stereo vision system based on distance-related distortion model.

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    This study introduces a flexible, high-precision stereo vision system calibration method using 3D points and checkerboards. The novel approach significantly reduces reprojection error and enhances length measurement accuracy in large volumes.

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    Area of Science:

    • Computer Vision
    • Robotics
    • Metrology

    Background:

    • Large-field-of-view stereo vision systems require precise calibration for accurate 3D reconstruction.
    • Existing calibration methods often lack flexibility and high accuracy, especially for large volumes.

    Purpose of the Study:

    • To develop a novel, flexible, and high-precision calibration method for large-field-of-view stereo vision systems.
    • To improve the accuracy of 3D measurements in large-scale environments.

    Main Methods:

    • A new distance-related distortion model was developed for calibration.
    • The method combines 3D points and checkerboard targets for calibration.
    • Experimental validation was performed on a large volume (5.0 m × 2.0 m × 16.0 m).

    Main Results:

    • Achieved a root mean square reprojection error of fewer than 0.08 pixels on the calibration dataset.
    • Demonstrated a mean relative error of 3.6‰ for length measurements in the large volume.
    • The proposed model exhibited the lowest reprojection error on the test dataset compared to other distance-related models.

    Conclusions:

    • The proposed calibration method offers enhanced accuracy and flexibility compared to existing techniques.
    • It effectively addresses the limitations of current calibration methods for large-field-of-view stereo vision systems.
    • The method is suitable for applications requiring precise 3D measurements in large-scale environments.