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New architecture for dynamic frame-skipping transcoder.

Kai-Tat Fung1, Yui-Lam Chan, Wan-Chi Siu

  • 1Dept. of Electron. and Inf. Eng., Hong Kong Polytech. Univ., Kowloon, China. enktfung@eie.polyu.edu.hk

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|February 5, 2008
PubMed
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This study introduces a novel DCT-domain architecture for video transcoding frame-rate reduction. It enhances picture quality and reduces complexity by minimizing re-encoding errors and optimizing frame skipping for smoother motion.

Area of Science:

  • Digital Video Processing
  • Video Compression and Transcoding

Background:

  • Video transcoding reduces bit rates but can degrade quality at high ratios.
  • Conventional frame skipping requires full decompression and re-computation, increasing complexity and errors.

Purpose of the Study:

  • To propose novel algorithms and architecture for efficient frame-rate reduction in video transcoding.
  • To improve picture quality and reduce computational complexity during transcoding.

Main Methods:

  • Developed a DCT-domain architecture for low-complexity transcoding.
  • Implemented direct addition of DCT coefficients and an error compensation feedback loop.
  • Introduced a dynamic frame-rate control scheme based on motion vectors and re-encoding errors.

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Main Results:

  • The proposed architecture significantly reduces re-encoding errors.
  • Achieved improved picture quality and smoother motion in transcoded video sequences.
  • Demonstrated reduced computational complexity compared to conventional methods.

Conclusions:

  • The novel DCT-domain frame-skipping transcoder offers robustness and fewer requantization errors.
  • The proposed methods effectively balance picture quality, motion smoothness, and computational efficiency.