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Performance evaluation of a digital holographic camera under variable source power and exposure time.

Gaurav Dwivedi, Lavlesh Pensia, Sanjit K Debnath

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    This study evaluates reconstructed image quality in digital holography using three setups. Optimization of light source power and exposure time improved image quality metrics across configurations.

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    Area of Science:

    • Optics and Photonics
    • Digital Imaging
    • Metrology

    Background:

    • Digital holography enables 3D reconstruction of objects.
    • Image quality in digital holography is crucial for accurate analysis.
    • Various experimental configurations exist, each with potential advantages and disadvantages.

    Purpose of the Study:

    • To evaluate and compare the quality of reconstructed amplitude images from three distinct digital holographic experimental configurations.
    • To optimize light source power and sensor exposure time for each configuration based on image quality metrics.
    • To analyze the performance trade-offs of different digital holography setups under varying optical conditions.

    Main Methods:

    • Recording digital holograms using conventional off-axis, concave-lens-based, and a specialized digital holographic camera.
    • Quantifying reconstructed image quality using speckle index, peak signal-to-noise ratio (PSNR), and structural similarity index measure (SSIM).
    • Systematically varying light source power and sensor exposure time to identify optimal parameters for each configuration.

    Main Results:

    • Quantitative quality metrics (speckle index, PSNR, SSIM) were calculated for all three configurations.
    • Optimal ranges for light source power and exposure time were determined for each setup, leading to improved reconstructed image quality.
    • Performance variations were observed among the three configurations, influenced by source power and exposure settings.

    Conclusions:

    • The study provides a comprehensive quality evaluation of reconstructed images in digital holography across different experimental setups.
    • Optimization of optical parameters significantly enhances image quality, demonstrating the importance of fine-tuning for specific applications.
    • The findings offer valuable insights for selecting and optimizing digital holographic systems for non-destructive testing and other applications.