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www.must.or.kr

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Page History: Wavelet Coding

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Page Revision: 2010/11/14 18:02


Important Factor

Wavelet selection

Image

  • A wavelet coding system : encoder, decoder

Image

  • Three-scale wavelet transforms.
  • (a) Haar wavelets (b) Daubechies wavelets, (c) symlets (d) Cohen-Daubechies Feauveau biorthogonal wavelets.

Image

  • Wavelet transform filter taps and zeroed coefficients when truncation the transform in Image below 1.5



Decomposition level Selection

Image

  • Decomposition level impact on wavelet coding the 512*512 image

Quantizer Design

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  • The impact of dead zone interval selection on wavelet coding.

JPEG-2000

JPEG
  • DCT기반
  • 압축률은 높음
  • 고주파 정보 유실
  • 블록현상 발생

JPEG-2000
  • Wavelet 기반
  • 블록현상 방지
  • RGB, CMYK, CIE등 256채널의 컬러표현
  • 다양한 정보 파일 삽입 가능

JPEG-2000 fundamental building blocks

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Pre-processiong

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Compression- DWT

Image

  • Impulse responses of the low- and highpass analysis filters for an irreversible 9-7 wavelet transform.

Quantization



Encoding



Decoding



Inverse quantization



Inverse transform



The inverse irreversible componet transform






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