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FiltrageMSICvSeptemb.. - Aymeric Histace

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4. Filtres dérivateurs<br />

n<br />

Implantation par convolution<br />

q Dérivées directionnelles dordre 1<br />

<strong>Aymeric</strong> <strong>Histace</strong><br />

55<br />

4. Filtres dérivateurs<br />

n<br />

Implantation par convolution<br />

q Dérivées directionnelles dordre 2<br />

n On utilise le plus souvent :<br />

2<br />

∂ f<br />

2<br />

∂x<br />

[ 1, −2,1]<br />

2<br />

∂ f<br />

2<br />

∂y<br />

⎡⎡ 1 ⎤⎤<br />

⎢⎢ ⎥⎥<br />

⎢⎢<br />

− 2<br />

⎥⎥<br />

⎢⎢⎣⎣<br />

1 ⎥⎥⎦⎦<br />

<strong>Aymeric</strong> <strong>Histace</strong><br />

56<br />

28

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