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Segmentation-driven compound document coding based on H.264/AVC-INTRA.

Alexandre Zaghetto1, Ricardo L de Queiroz

  • 1Department of Electrical Engineering, Universidade de Brasilia, Brasilia, DF, 70910-900, Brazil. zaghetto@image.unb.br

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|July 4, 2007
PubMed
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This study demonstrates that H.264/AVC intraframe compression can effectively compress mixed documents using a single codec. By adapting quantization parameters, text sharpness is improved with minimal loss in pictorial regions.

Area of Science:

  • Digital image compression
  • Video coding standards

Background:

  • Mixed content documents (text, graphics, pictures) traditionally require multiple compression algorithms.
  • Single compressor approaches often struggle to balance fidelity between diverse image regions.

Purpose of the Study:

  • To investigate the efficacy of H.264/AVC intraframe mode for compressing mixed-content documents using a single codec.
  • To enhance text sharpness in compressed mixed images without significant degradation of pictorial content.

Main Methods:

  • Employed a segmentation-driven adaptation strategy for H.264/AVC compression.
  • Modified the quantization parameter on a macroblock basis, allocating more bits to text regions.
  • Diverted bits from pictorial regions to preserve text edge clarity.

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Main Results:

  • Achieved superior text sharpness in reconstructed mixed images compared to standard unadapted coding.
  • Maintained negligible visual losses in pictorial regions.
  • Demonstrated that H.264/AVC-INTRA, as a single coder, outperforms JPEG-2000 for compound images.

Conclusions:

  • A single H.264/AVC intraframe compressor with adaptive quantization is effective for mixed-content documents.
  • The proposed method offers a viable alternative to multi-compressor solutions, improving text legibility.
  • H.264/AVC-INTRA shows promise as a superior single-codec solution for compound image compression.