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Related Concept Videos

Medical-grade Sterilizable Target for Fluid-immersed Fetoscope Optical Distortion Calibration07:03

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This article describes the design and development of a sterilizable custom camera optical distortion calibration target for the peri-operative, fluid-immersed calibration of endoscopes during endoscopic...
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Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
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Mean Absolute Deviation

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The mean absolute deviation is also a measure of the variability of data in a sample. It is the absolute value of the average difference between the data values and the mean.
Let us consider a dataset containing the number of unsold cupcakes in five shops: 10, 15, 8, 7, and 10. Initially, calculate the sample mean. Then calculate the deviation, or the difference, between each data value and the mean. Next, the absolute values of these deviations are added and divided by the sample size to...
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Here, we present a robust protocol to quantify 40 compounds involved in central carbon and energy metabolism in cell-free protein synthesis reactions. The cell-free synthesis mixture is derivatized with aniline for effective separation using reversed-phase liquid chromatography and then quantified by mass spectrometry using isotopically labelled internal...
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Instrument Calibration

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Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
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Calibration Curves07:43

Calibration Curves

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Source: Laboratory of Dr. B. Jill Venton - University of Virginia
Calibration curves are used to understand the instrumental response to an analyte and predict the concentration in an unknown sample. Generally, a set of standard samples are made at various concentrations with a range than includes the unknown of interest and the instrumental response at each concentration is recorded. For more accuracy and to understand the error, the response at each concentration can be repeated so an error...
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Related Experiment Video

Updated: Jan 19, 2026

Medical-grade Sterilizable Target for Fluid-immersed Fetoscope Optical Distortion Calibration
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Stereo calibration with absolute phase target.

Yuwei Wang, Lu Liu, Bolin Cai

    Optics Express
    |September 13, 2019
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel stereo calibration method using an absolute phase target and phase-shifting fringes. It enhances 3D photogrammetry by enabling calibration with all feature points, improving accuracy and flexibility.

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    Area of Science:

    • Computer Vision
    • Metrology

    Background:

    • Stereo cameras are vital for 3D photogrammetry, requiring accurate stereo calibration.
    • Traditional methods are limited by feature points within overlapping fields-of-view (FOV).

    Purpose of the Study:

    • To propose a robust and accurate stereo calibration method for 3D photogrammetry.
    • To overcome limitations of traditional methods by utilizing whole-field information.

    Main Methods:

    • Utilized an absolute phase target with horizontal and vertical phase-shifting fringes.
    • Established a one-to-one mapping from world to image points using absolute phase.
    • Leveraged phase robustness against camera defocusing and depth-of-field (DOF) variations.

    Main Results:

    • The proposed method successfully calibrated stereo cameras using all feature points in overlapping and non-overlapping FOVs.
    • Demonstrated robustness against camera defocusing, allowing flexible target placement.
    • Achieved high accuracy and robustness, validated by simulations and experiments.

    Conclusions:

    • The absolute phase target method offers a flexible and accurate approach to stereo calibration.
    • This technique enhances 3D photogrammetry by expanding usable data points and tolerating defocusing.