ch8-wavelets
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Transcript ch8-wavelets
What is Wavelet Analysis?
Wavelet analysis : sounds나 images를 wavelets으로
분해 (decomposition)
Wavelets
Component waves of varying durations
Localized vibrations of a sound signal
Localized variations of detail in an image
The heart of wavelet analysis : multiresolution analysis
Signal을 다른 크기의 resolution level을 가지는
subsignal들로 분해
What is Wavelet Analysis?
What is Wavelet Analysis?
Wavelet transform
Final image → broad masses
Signal로부터 lower resolution signal을 생성하기 위해
finest details을 어떻게 제거해가는지 specify
Lower resolution signal : original signal에서 추출된 짧은
duration의 wavelet과 비교해 볼 때 좀 더 긴 duration의
oscillations을 가지는 signal
Musical analysis : melody(essential parts) + ornament
Skeleton(trend)을 얻기 위해 detail(fluctuation)을 걷어
냄으로써 signal을 분해하는 가장 간단한 방법