Digital Image Processing
Digital Image Processing
Digital Image Processing
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미분 연산자(Derivative Operators)<br />
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미분 연산자(Derivative Operators)<br />
라플라시안(Laplacian)<br />
• 정의<br />
∇<br />
2<br />
f =<br />
∂<br />
2<br />
f<br />
∂x<br />
2<br />
+<br />
∂<br />
2<br />
f<br />
∂y<br />
2<br />
• 디지털 근사화: x 방향 2차 편미분<br />
∂<br />
2<br />
f<br />
∂x<br />
2<br />
= f ( x + 1, y)<br />
+ f ( x −1,<br />
y)<br />
• 디지털 근사화: y 방향 2차 편미분<br />
∂<br />
2<br />
f<br />
∂y<br />
2<br />
= f ( x,<br />
y + 1) + f ( x,<br />
y −1)<br />
• 최종 결과<br />
−<br />
−<br />
2 f ( x,<br />
y)<br />
2 f ( x,<br />
y)<br />
∇<br />
2<br />
f<br />
=<br />
[ f ( x + 1, y)<br />
+<br />
f ( x −1,<br />
y)<br />
+<br />
f ( x,<br />
y + 1) +<br />
f ( x,<br />
y −1)]<br />
− 4 f ( x,<br />
y)<br />
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