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Weighted Mean00:57

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While taking the arithmetic, geometric, or harmonic mean of a sample data set, equal importance is assigned to all the data points. However, all the values may not always be equally important in some data sets. An intrinsic bias might make it more important to give more weightage to specific values over others.
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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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Simplified weighting function for high dynamic range video frame formation.

David J Griffiths, Alfred Wicks

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    High dynamic range (HDR) video development lags behind HDR imagery. A new simplified weighting scheme improves HDR video formation, even with limited exposures and varying sensor settings.

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    Area of Science:

    • Computer Vision
    • Image Processing
    • Computational Photography

    Background:

    • High dynamic range (HDR) imagery is common in consumer cameras.
    • HDR video development lags behind, with various frame formation methods and architectures.
    • Current HDR video often uses bracketed frames and radiometric calibration with a weighted maximum likelihood estimator.

    Purpose of the Study:

    • To investigate ideal weighting schemes for minimizing error in HDR image formation.
    • To propose a novel, nonrecursive, simplified weighting scheme for HDR video.
    • To develop a method for testing weighting scheme resilience to errors in multi-imager systems.

    Main Methods:

    • Utilized optical attenuation, integration time, and sensor gain for the new weighting scheme.
    • Developed a testing methodology to assess weighting scheme error resilience.
    • Evaluated schemes under limited exposures and wide exposure value offsets.

    Main Results:

    • The proposed nonrecursive scheme offers a simplified approach to HDR video formation.
    • The testing method effectively evaluates weighting scheme performance under common real-world conditions.
    • The new scheme shows promise for improving HDR video quality in challenging scenarios.

    Conclusions:

    • A simplified weighting scheme can effectively contribute to HDR video development.
    • The proposed method aids in selecting optimal parameters for HDR video systems.
    • Further research can refine HDR video formation techniques for consumer applications.