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An error concealment algorithm for images subject to channel errors.

W M Lam1, A R Reibman

  • 1Thomson Consumer Electron., Indianapolis, IN.

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|January 1, 1995
PubMed
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This study introduces a simple algorithm to fix bit errors in images encoded with discrete cosine transform (DCT) and variable length codes (VLCs). It improves image quality without needing encoder changes or extra bandwidth, enabling real-time error concealment.

Area of Science:

  • Digital image processing
  • Video compression
  • Error resilience

Background:

  • Bit errors in compressed images (DCT/VLC) can corrupt block structures and data.
  • Incorrectly decoded DCT coefficients lead to visual artifacts and data loss.
  • Existing error concealment methods may require encoder modifications or increased bit rates.

Purpose of the Study:

  • To develop an efficient algorithm for concealing bit errors in DCT/VLC coded images and sequences.
  • To ensure real-time processing capabilities for decoding and error concealment.
  • To improve image quality after transmission errors without additional bit rate.

Main Methods:

  • An algorithm utilizing transform domain information to identify and correct affected blocks.
  • Error concealment applied to discrete cosine transform (DCT) coefficients.

Related Experiment Videos

  • No modification to existing encoders or increase in bit rate.

    • Main Results:

    • Successfully identified and corrected block splitting and merging errors caused by bit errors.
    • Recovered corrupted DC coefficients and repositioned DCT coefficients accurately.
    • Significantly improved image quality after error concealment.

    Conclusions:

    • The proposed algorithm effectively conceals bit errors in DCT/VLC coded images.
    • Real-time concealment is achievable due to the algorithm's simplicity.
    • The method enhances visual quality without impacting compression efficiency.