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    This study introduces a new method for video stream switching using piecewise constant (PWC) functions, improving compression efficiency and reducing decoder complexity compared to existing distributed source coding (DSC) and H.264 SP-frame methods.

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    Area of Science:

    • Video compression and streaming technologies.
    • Digital signal processing for multimedia.
    • Information theory and coding.

    Background:

    • Efficient video stream switching is crucial for interactive applications like bitrate adaptation and view switching.
    • Existing distributed source coding (DSC) methods offer stream switching but involve complex coding and decoding.
    • Side information (SI) frames are used in DSC for frame reconstruction across different streams.

    Purpose of the Study:

    • To propose an alternative, less complex approach for merging multiple side information (SI) frames for video stream switching.
    • To enhance compression efficiency and reduce decoder complexity in video streaming applications.
    • To evaluate a novel merge mechanism using piecewise constant (PWC) functions.

    Main Methods:

    • Developed a novel merge mechanism employing piecewise constant (PWC) functions for combining SI frames.
    • Transmitted parameters of PWC merge functions for identical frame reconstruction at the decoder.
    • Considered two scenarios: target frame reconstruction and joint optimization for rate-distortion criteria.

    Main Results:

    • The proposed PWC merge technique demonstrated superior compression efficiency compared to DSC and H.264 SP-frame approaches.
    • Achieved reduced decoder complexity in both evaluated scenarios.
    • Guaranteed identical frame reconstruction given known SI blocks.

    Conclusions:

    • Piecewise constant (PWC) functions offer an effective and efficient alternative for merging SI frames in video stream switching.
    • The proposed method significantly improves upon existing DSC and H.264 SP-frame techniques.
    • This approach holds promise for enhancing interactive video streaming applications.