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Related Experiment Videos

Tile-boundary artifact reduction using odd tile size and the low-pass first convention.

Jianxin Wei1, Mark R Pickering, Michael R Frater

  • 1School of Electrical Engineering, University College, The University of New South Wales, Australian Defence Force Academy, Canberra ACT 2600, Australia. j.wei@adfa.edu.au

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|August 27, 2005
PubMed
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Boundary artifacts in wavelet image coding are caused by tile size and symmetric extension methods. A new odd tile size method significantly reduces these artifacts, improving image compression quality.

Area of Science:

  • Image processing
  • Digital signal processing
  • Computer vision

Background:

  • Wavelet-based lossy image coding commonly exhibits tile-boundary artifacts.
  • The underlying causes of these artifacts have remained poorly understood.
  • Conventional methods for tile size selection and symmetric extension contribute to artifact formation.

Purpose of the Study:

  • To identify the root causes of tile-boundary artifacts in wavelet image decomposition.
  • To propose a novel method for mitigating these artifacts.
  • To demonstrate the effectiveness of the proposed method in reducing visual distortions.

Main Methods:

  • Analysis of conventional tile size selection and symmetric extension techniques.
  • Development of a novel image decomposition method utilizing odd tile sizes (2N + 1 samples).

Related Experiment Videos

  • Implementation of the odd tile length low-pass first (OTLPF) convention.

    • Main Results:

    • Boundary artifacts are an inherent consequence of standard tile size selection and symmetric extension.
    • The OTLPF convention with odd tile sizes demonstrably reduces boundary artifacts compared to even tile sizes.
    • Images compressed using the OTLPF method exhibit significantly fewer artifacts at equivalent bit rates.

    Conclusions:

    • The choice of tile size and symmetric extension method critically impacts artifact generation in wavelet image coding.
    • Employing odd tile sizes, specifically with the OTLPF convention, offers a viable solution for artifact reduction.
    • The OTLPF convention is compatible with existing standards like JPEG 2000 Part 2, enabling practical implementation.