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    This study introduces a novel optical-digital method to extend depth of field (DOF) by fusing images. The technique utilizes phase masks and liquid crystal spatial light modulators for enhanced imaging capabilities.

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    Area of Science:

    • Optics
    • Digital Image Processing

    Background:

    • Achieving extended depth of field (DOF) is crucial for various imaging applications.
    • Traditional methods often face limitations in flexibility and performance.

    Purpose of the Study:

    • To present a novel optical-digital tunable depth of field (DOF) methodology.
    • To enhance image quality by fusing sharp regions from multiple images.

    Main Methods:

    • Utilizing a set of source images captured with different phase masks.
    • Implementing phase masks via an annular liquid crystal spatial light modulator with 16-ring electrodes.
    • Developing a fusion algorithm to combine the sharpest depth regions.

    Main Results:

    • Demonstrated successful extension of DOF through optical-digital means.
    • Experimental results showed qualitative and quantitative improvements.
    • The proposed fusion algorithm outperformed existing methods.

    Conclusions:

    • The presented methodology offers a tunable and effective approach to extend DOF.
    • This technique provides superior performance compared to conventional fusion algorithms.
    • The study highlights the potential of phase mask technology in advanced imaging.