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On RD optimized progressive image coding using JPEG.

J In, S Shirani, F Kossentini

    IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
    |February 13, 2008
    PubMed
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    A new rate-distortion optimized progressive JPEG encoder offers superior compression efficiency and precise rate control compared to sequential JPEG. This advanced algorithm is ideal for emerging standards like JPEG-2000.

    Area of Science:

    • Digital image compression
    • Computer vision and image processing

    Background:

    • The JPEG standard supports multiple operational modes, with sequential and progressive modes being the most prevalent.
    • Progressive JPEG encoder performance is highly dependent on its structural design, unlike the relatively consistent performance of sequential JPEG.

    Discussion:

    • This research introduces a rate-distortion (RD) optimized, JPEG-compliant progressive encoder.
    • The encoder generates a sequence of scans ordered by decreasing importance, enhancing compression efficiency.

    Key Insights:

    • The developed progressive JPEG encoder significantly outperforms optimized sequential JPEG encoders, particularly at low and high bit rates.
    • It offers precise rate/distortion control, a feature lacking in many existing JPEG-compliant encoders.

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    Outlook:

    • The enhanced compression performance and precise rate control align with requirements for the next-generation JPEG-2000 standard.
    • This work provides a foundation for advanced image compression techniques in future standards.