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Page Revision: 2010/11/14 18:04

Important Factor

Wavelet selection

• A wavelet coding system : encoder, decoder
  

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

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

Decomposition level Selection

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

Quantizer Design

• 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

Pre-processiong

Compression- DWT

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

"lifting" and "scaling" operations.

Quantization

Encoding

Decoding

Inverse quantization

Inverse transform

The inverse irreversible componet transform

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