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Object-based analysis-synthesis coding (OBASC) based on the source model of moving flexible 3-D objects.

J Ostermann1

  • 1Inst. fur Theor. Nachrichtentech. und Inf., Hannover Univ.

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|January 1, 1994
PubMed
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Object-based analysis-synthesis coding (OBASC) enhances image encoding efficiency. A new flexible 3-D object model (F3D) reduces bit rates by 12.5% while maintaining picture quality.

Area of Science:

  • Computer Vision
  • Image Processing
  • Video Compression

Background:

  • Object-based analysis-synthesis coding (OBASC) is crucial for efficient moving image encoding at low data rates.
  • Current methods rely on source models to describe object motion, shape, and color.

Purpose of the Study:

  • To introduce and evaluate a novel OBASC approach using a flexible 3-D object model (F3D).
  • To compare the efficiency of the F3D model against the rigid 3-D object model (R3D).

Main Methods:

  • Model-based image analysis to extract object parameters (motion, shape, color).
  • Object-dependent parameter coding for efficient data transmission.
  • Image synthesis using coded parameter sets.
  • Hybrid approach combining R3D and F3D models, applying F3D only where R3D is insufficient.

Related Experiment Videos

Main Results:

  • The F3D model requires additional flexible-shape parameters compared to R3D.
  • The hybrid F3D/R3D approach reduced the bit rate from 64 kb/s to 56 kb/s.
  • Signal-to-noise ratio (SNR) for encoded color parameters remained consistent, indicating preserved picture quality.

Conclusions:

  • The F3D source model significantly improves OBASC efficiency for moving images.
  • A hybrid approach leveraging both rigid and flexible object models offers optimal compression performance.
  • This method achieves substantial bit rate reduction without compromising visual quality.