Journal of the Institute of Electronics Engineers of Korea SP (대한전자공학회논문지SP)

The Institute of Electronics and Information Engineers (대한전자공학회)
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A Wavelet CODEC that is with JPEG

JPEG와 호환 가능한 Wavelet CODEC

  • Published : 2001.01.01
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Abstract

WT(Wavelet Transform) is used to avoid blocking effect that is the disadvantage of JPEG using DCT(Discrete Cosine Transform). Because the proposed coding scheme is the same as JPEG, the proposed algorithm is compatible with that of JPEG. To achieve the goal, WT'ed image is reconstructed into 8$\times$8 coding block. Each coding block is quantized with the proposed weighting matrix that is derived from human visual characteristic and error analysis in WT'ed domain. By experiments, the proposed algorithm is superior to JPEG, in terms of PSNR(Peak Signal to Noise Ratio) and WMSE(Weighted Mean Square Error).

JPEG의 부호화 기법에서 DCT의 단점인 블록효과를 제거하기 위해 웨이브릿 변환을 사용하였다. 기존의 JPEG과 호환성 유지하기 위하여, JPEG 부호화 기법과 동일한 기법을 사용할 수 있는 부호화기를 제안한다. 이를 위하여 웨이브릿 변환영역에서 각 대역의 신호를 8×8로 재구성하였고, 각 대역의 에러분석과 인간 시각특성을 고려하여 양자화 가중치를 구하여 양자화 하였다. 실험을 통하여 웨이브릿을 사용한 제안한 기법이 기존의 JPEG 보다 (Peak Signal to Noise Ratio), WMSE(Weighted Mean Square Error) 척도에서 다소 우수함을 보였다.

Keywords

References

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