Digital Image Processing
Digital Image Processing
Digital Image Processing
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선명화(Sharpening)<br />
언샤프 마스킹(unsharp masking)<br />
• 영상의 원 영상에서 저역 통과된 영상을 뺌<br />
f ( x,<br />
y)<br />
= f<br />
org<br />
( x,<br />
y)<br />
− f ( x,<br />
y)<br />
sharp<br />
low−<br />
pass<br />
• 고역 통과 필터와 같은 결과<br />
0<br />
-1/5<br />
0<br />
-1/9<br />
-1/9<br />
-1/9<br />
-1/5<br />
4/5<br />
-1/5<br />
-1/9<br />
8/9<br />
-1/9<br />
0<br />
-1/5<br />
0<br />
-1/9<br />
-1/9<br />
-1/9<br />
19/46<br />
선명화(Sharpening)<br />
언샤프 마스킹(unsharp masking)<br />
Lum. In<br />
3x3 Mean<br />
Filter<br />
-<br />
+<br />
+<br />
+<br />
Saturator<br />
Lum. Out<br />
α<br />
Edge Signal<br />
Difference signal<br />
Mean Filtering<br />
Result<br />
Resulting Signal<br />
20/46
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