IEIE Transactions on Smart Processing and Computing

The Institute of Electronics and Information Engineers (대한전자공학회)
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Inter-Conversion Matrix for Transcoding Block DCT and DWT-Based Compressed Images

  • Kim, Donggyun (Image Processing and Intelligent Systems Laboratory, Graduate School of Advanced Image Science, Multimedia, and Film, Chung-Ang University) ;
  • Lim, Sanghee (Image Processing and Intelligent Systems Laboratory, Graduate School of Advanced Image Science, Multimedia, and Film, Chung-Ang University) ;
  • Paik, Joonki (Image Processing and Intelligent Systems Laboratory, Graduate School of Advanced Image Science, Multimedia, and Film, Chung-Ang University)
  • Received : 2013.11.22
  • Accepted : 2014.03.20
  • Published : 2014.06.30
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Abstract

This study derived the inter-conversion matrices, which can be used in heterogeneous image transcoding between the compressed images using different transforms, such as the $8{\times}8$ block discrete cosine transform (BDCT) and the one-level discrete wavelet transform (DWT). Basically, to obtain the one-level DWT coefficients from $8{\times}8$ BDCT, inverse BDCT should be performed followed by forward DWT, and vice versa. On the other hand, if the proposed interconversion approach is used, only one inter-conversion matrix multiplication makes the corresponding transcoding possible. Both theoretical and experimental analyses showed that the amount of computation of the proposed approach decreases over 20% when the inter-conversion matrices are used under specific conditions.

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References

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