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Swin-PSAxialNet: An Efficient Multi-Organ Segmentation Technique
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One-Pass Mode and Motion Decision for Multilayer Quality Scalable Video Coding.

Meng Xu, Zhan Ma, Yao Wang

    IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
    |August 5, 2015
    PubMed
    Summary

    This study introduces a low-complexity algorithm for scalable video coding, significantly reducing encoding time by performing motion estimation only at the base layer. This method enhances efficiency for H.264/SVC, including coarse grain and medium grain scalability.

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    Characterization of Anisotropic Leaky Mode Modulators for Holovideo
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    Area of Science:

    • Computer Science
    • Electrical Engineering
    • Video Compression

    Background:

    • Scalable video coding (SVC) enables multiple quality layers from a single bitstream.
    • H.264/SVC is a widely adopted standard for efficient video compression.
    • Existing SVC methods often incur high computational complexity due to redundant processing across layers.

    Purpose of the Study:

    • To develop a low-complexity algorithm for motion estimation and mode decision in H.264/SVC.
    • To optimize encoding efficiency for both coarse grain scalability (CGS) and medium grain scalability (MGS).
    • To achieve significant speedup without substantial loss in rate-distortion performance.

    Main Methods:

    • Implemented a novel algorithm performing motion estimation and mode decision exclusively at the base layer (BL).
    • Higher layers inherit motion and mode decisions from the BL.
    • Utilized the highest layer reconstructed frame as the reference for BL motion estimation.
    • Optimized Lagrangian multipliers based on quantization parameters of current and higher layers.
    • Introduced an early skip/direct mode decision to further accelerate encoding.

    Main Results:

    • Achieved over 2x (up to 5x) speedup in a three-layer encoder compared to JSVM.
    • Demonstrated complexity reduction by performing motion estimation/mode decision at most once per macroblock.
    • Observed slightly improved rate-distortion performance due to single transmission of motion/mode information.
    • Validated performance on CIF and HD sequences for both CGS and MGS.

    Conclusions:

    • The proposed algorithm offers a significant reduction in computational complexity for H.264/SVC encoding.
    • Inheriting BL decisions in higher layers provides a near-optimal solution with substantial speed gains.
    • The method presents an effective trade-off between encoding speed and coding efficiency (Bjontegaard delta rate).