June 2018
Beginner to intermediate
304 pages
7h 38m
Korean
Content preview from 우아한 사이파이: 수학, 과학, 엔지니어링을 위한 파이썬 데이터 분석 라이브러리 SciPy
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95
3
장
이미지 지역망 : ndimage
합성곱의 가장 좋은 점은 연관성이다. 즉, 스무딩된 신호의 파편을 알고 싶다면 스무딩된 차이
필터로 동등한 합성곱을 구할 수 있다. 일반적으로 데이터보다 훨씬 작은 필터만 스무딩할 수
있어서 많은 계산 시간을 절약할 수 있다.
smooth
_
diff
=
ndi
.
convolve
(
gaussian
_
kernel
(
25
,
3
),
diff
)
plt
.
plot
(
smooth
_
diff
);
이 차이 스무딩 필터는 중앙의 가장자리를 찾아서 그 차이를 계속 유지한다. 이 연속성은 실제
가장자리의 경우에만 발생하지만 잡음으로 인한 ‘가짜
spurious
’ 가장자리에서는 발생하지 않는
다. [그림
3
-
1
]을 확인해보자.
sdsig
=
ndi
.
convolve
(
sig
,
smooth
_
diff
)
plt
.
plot
(
sdsig
);
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