Le Descripteur SIFT (Scale Invariant Feature Transform) [1] consiste a extraire un histo- gramme d orientations de gradients autour d un point d inter^et de l image. Le principe du calcul du descripteur est illustre a la gure

data
....\.DS_Store
....\affreux.wav
....\akesuper.wav
....\bonjour
....\.......\David1.wav
....\.......\David2.wav
....\.......\David3.wav
....\.......\Francis1.wav
....\.......\Francis2.wav
....\.......\Francis3.wav
....\.......\Vincent1.wav
....\.......\Vincent2.wav
....\.......\Vincent3.wav
....\lenna.raw
....\shrek.bmp
Exercice1
.........\Exercice1.m
.........\fft2bf.m
.........\phiChi2.m
.........\readWavDirectory.m
Exercice2
.........\Exercice2.m
Exercice3
.........\Debruit.m
.........\Exercice3.m
.........\Seuillage.m
.........\seuilOptimal.m
Exercice4
.........\divideByScale.m
.........\Exercice4.m
.........\Seuillage.m
.........\seuilOptimal.m
Exercice5
.........\exercice5_1.m
.........\exercice5_2.m
.........\jpeg.m
.........\jpeg2000.m
wavelet
.......\.DS_Store
.......\aconv.m
.......\CWT_Wavelab.m
.......\dct.m
.......\dct2.m
.......\DisplayWaveCoeff.m
.......\DownDyadHi.m
.......\DownDyadLo.m
.......\dyad.m
.......\dyad2ix.m
.......\dyadlength.m
.......\exUseWavelet.m
.......\FWT2_PO.m
.......\FWT_PO.m
.......\HardThresh.m
.......\HybridThresh.m
.......\iconv.m
.......\idct.m
.......\idct2.m
.......\ImageCWT.m
.......\IWT2_PO.m
.......\IWT_PO.m
.......\lenna.raw
.......\LockAxes.m
.......\lshift.m
.......\MakeONFilter.m
.......\MirrorFilt.m
.......\PlotMultiRes.m
.......\PlotSpikes.m
.......\PlotWaveCoeff.m
.......\quadlength.m
.......\readimage.m
.......\rshift.m
.......\script_debruitage_simple.m
.......\ShapeAsRow.m
.......\ShapeLike.m
.......\SNR.m
.......\SNR.m~
.......\SoftThresh.m
.......\UnlockAxes.m
.......\UpDyadHi.m
.......\UpDyadLo.m
.......\UpSample.m
.......\ValSUREThresh.m
.......\wreverse.m

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