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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96
우아한 사이파이
그림
3-1
잡음 신호가 적용된 차이 스무딩 필터
여전히 흔들리는 것처럼 보이지만, 신호-대-잡음비
SNR
:
signal
-
to
-
noise
ratio
는 보통 차이 필터를 사
용할 때보다 차이 스무딩 필터에서 훨씬 크다.
필터링
위의 작업을 필터링이라고 한다. 물리적 전기회로에서 이러한 작업 중 상당수는 특정 전류를 허용하고 다른
전류를 차단하는 하드웨어로 구현된다. 이러한 하드웨어 구성요소를 필터라고 한다. 예를 들어 전류에서 고주
파 전압 변동을 제거하는 필터를 저역 통과 필터
low
-
pass
filter
라고 한다.
3.3
이미지 필터링(2차원 필터)
위에서 다룬
1
차원 필터링을 바탕으로
2
차원 필터링을 쉽게 이해할 수 있다. 다음은 동전의 가
장자리를 찾는
2
차원 차이 필터 코드다.
coins
=
coins
.
astype
(
float
) /
255
# 오버플로(
overflow
) 에러 방지
diff2d
=
np
.
array
([[
0
,
1
,
0
], [
1
,
0
, -
1
], [
0
, -
1
,
0
]])
coins
_
edges
=
ndi
.
convolve
(
coins
,
diff2d
)
io
.
imshow
(
coins
_
edges
);
97
3
장
이미지 지역망 : ndimage
원리는
1
차원 필터와 같다. 이미지의 모든 점에서 필터를 배치하고, 이미지 값과 필터 값의 내
적을 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.