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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176
우아한 사이파이
5.3.1
연습문제 : 이미지 회전
위 그림에서 원점 (
0
,
0
)을 중심으로 이미지가 회전됐다. 그렇다면 이미지의 중심을 기준으로
이미지를 회전할 수 있을까?
HINT
_
변형(
translation
)에 사용할 변환행렬(위/아래 또는 왼쪽/오른쪽 이미지 슬라이딩)은 다음과 같다.
There’s that rotation!
Exercise: Image Rotation
The rotation happens around the origin, coordinates (0, 0). But can you rotate the
image around its center?
Hint: The transformation matrix for a translation (i.e., sliding the image up/down or
left/right), is given by:
H
tr
=
10t
r
01t
c
001
138 | Chapter 5: Contingency Tables Using Sparse Coordinate Matrices
t
r
픽셀을 아래로,
t
c
픽셀을 오른쪽으로 이동해보자.
앞서 말했듯이 이미지 변환에 대한 희소 선형 연산자는 빠르다.
ndimage
와 비교하여 성능을
측정해보자. 공정한 비교를 위해서
ndimage
에 선형 보간을 적용한다 (
order
=
1
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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.
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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.