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An embedded still image coder with rate-distortion optimization.

J Li1, S Lei

  • 1Sharp Lab. of America, Camas, WA 98607, USA. lijin@sharplabs.com

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|February 13, 2008
PubMed
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This study introduces rate-distortion optimized embedding (RDE) for embedded coders. RDE improves coding efficiency by allocating bits to coefficients with the steepest rate-distortion slope, optimizing performance across various bit rates.

Area of Science:

  • Digital signal processing
  • Information theory
  • Image and video compression

Background:

  • Fixed rate coders achieve optimal performance when all coefficients share the same rate-distortion (R-D) slope.
  • Embedded coders offer flexibility but can be suboptimal without specific optimization strategies.

Purpose of the Study:

  • To optimize the performance of embedded coders in a rate-distortion (R-D) sense.
  • To introduce a novel coding strategy named rate-distortion optimized embedding (RDE).

Main Methods:

  • Developed RDE strategy that prioritizes coefficients with the steepest R-D slope (maximum distortion decrease per bit).
  • Utilized expected R-D slope for efficient bit allocation, avoiding transmission overhead.
  • Integrated R-D slope calculation with QM-coder probability estimation for a lookup table operation.

Related Experiment Videos

Main Results:

  • RDE ensures optimal R-D performance even when the bitstream is truncated at any point.
  • The proposed method significantly enhances coding efficiency over a broad range of bit rates.
  • Expected R-D slope calculation is efficient and compatible with existing QM-coder probability tables.

Conclusions:

  • Rate-distortion optimized embedding (RDE) provides a significant improvement in coding efficiency for embedded coders.
  • The RDE strategy offers a practical and efficient method for optimizing compression performance.
  • This approach maintains optimal R-D performance, enhancing the utility of embedded coding techniques.