Slides6 - Course 18.327 and 1.130 Course Wavelets and...

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Unformatted text preview: Course 18.327 and 1.130 Course Wavelets and Filter Banks Matlab wavelet toolbox. Matlab Matlab Example 3 Matlab 1. 1-D signal analysis 1. MATLAB M-file 2 Daubechies 9/7 pair: zeros of Daubechies H0 and F0 and >> example3 >> Zeros of H0(z) ans = 2.0311 2.0311 -1.0001 -1.0001 -0.9999 -0.9999 0.2841 0.2841 + + + + - 1.7390i 1.7390i 0.0001i 0.0001i 0.0001i 0.0001i 0.2432i 0.2432i Zeros of F0(z) ans = 3.0407 -1.0010 -1.0010 -0.9990 -0.9990 0.3289 + + - 0.0010i 0.0010i 0.0010i 0.0010i 3 Complete Set of Daub 9/7 Filters Complete 4 Frequency Responses of Daub 9/7 Frequency 5 Single Stage Decomposition Single 6 3-Stage Decomposition 7 3-Stage Decomposition 8 Individually Reconstructed Individually Branches 9 Reconstruction Error --- upcoef Reconstruction 10 10 Reconstruction Error --- wrcoef Reconstruction 11 11 Reconstruction Error --- waverec Reconstruction 12 12 Matlab Example 4 Matlab 1. 2-D image analysis 1. MATLAB M-file 13 13 Original Image Original 14 14 Wavelet Decomposition Wavelet 15 15 Single Stage Decomposition Single 16 16 Two-Stage Decomposition Two 17 17 Reconstructed Branches Reconstructed 18 18 Global Hard Thresholding Global 19 19 Variable Hard Thresholding Variable 20 20 ...
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This note was uploaded on 12/04/2011 for the course ESD 18.327 taught by Professor Gilbertstrang during the Spring '03 term at MIT.

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