Conversion Scheme for DCT-Domain Transcoding of MPEG-2 to H.264/AVC

  • Joo-kyong Lee
  • Ki-dong Chung
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3617)


The 4×4 approximate discrete cosine transform (DCT) of H.264/AVC [1] makes it difficult to transcode the pre-coded video contents with the previous video coding standards to H.264/AVC in DCT domain. This is due to the difference between 8×8 DCT used previous standards and 4×4 DCT in H.264/AVC. In this paper, we propose an efficient algorithm that converts the quantized 8×8 DCT block of MPEG-2 into newly quantized four 4×4 DCT blocks of H.264/AVC to support DCT-domain transcoding. Experimental results show that the proposed scheme improves computational complexity by 5~11% and video quality by 0.1 ~ 0.5 dB compared with cascaded pixel-domain transcoding that exploits inverse quantization (IQ), inverse DCT (IDCT), DCT, and re-quantization (re-Q).


Discrete Cosine Transform Video Quality Discrete Cosine Transform Coefficient Inverse Discrete Cosine Transform Conversion Scheme 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Joo-kyong Lee
    • 1
  • Ki-dong Chung
    • 1
  1. 1.Dept. of Computer EngneeringPusan National Univ.BusanKorea

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