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Complexity- Rate- Distortion Optimization for Video Compression in H.264/AVC Standard

Abdoli, Mohsen | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44966 (19)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Ghanbari, Mohammad
  7. Abstract:
  8. As the applications of digital video is becoming elementary parts of our daily life both in entertainment and business, the amount of digital video data being transferred by or stored in PDAs rapidly increases. Despite the fact that H.264/AVC is very efficient in terms of compression efficiency, however it is too complex to be used in devices in which their battery energy is restricted and cannot bear this complexity. In this thesis, a fast mode decision algorithm is proposed which brings into play the correlation in content of the video frames and reduces the number of candidate inter modes to be evaluated.For each macroblock, the proposed method performs two steps: first step attempts to restrict the depth of search for the optimum inter mode. This is done by finding the most similar region in the reference frame and considering the optimum inter modes related to four macroblocks covering that region. Afterward, to avoid the unnecessary computation of overlapped positions in motion estimation, the second step changes the order of inter modes in such a way that the smaller modes are evaluated first.The experimental results indicate that the proposed fast inter mode decision can reduce the number of operations 61%, while the PSNR drops 0.06dB in average and without significant increase in bit rate
  9. Keywords:
  10. Video Compression ; Motion Estimation ; H.264 Video Codec ; Complexity - Rate - Distortion (CRD)Optimization ; Mode Decision

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