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 warpAffine 함수를 사용하여 아핀 변환(Affine Transformation)을 구현합니다.





 아핀 변환에서 원본 이미지의 모든 평행선은 출력 이미지에서 여전히 평행합니다. 





 아핀 변환 행렬을 찾으려면 입력 이미지의 3점과 대응하는 출력 이미지의 3점이 필요합니다.





 getAffineTransform 함수를 사용하면 대응하는 3점 쌍에 대한 변환 행렬을 구할 수 있습니다.





 warpAffine함수를 사용하여 변환을 실행합니다.





 마지막 업데이트 – 2018. 10. 5









 왼쪽 위, 오른쪽 위, 왼쪽 아래 순으로 마우스로 클릭합니다.




<figure><img data-lazy-fallback="1" data-attachment-id="5751" data-permalink="https://webnautes.blog/5750/word-image-5750-1/" data-orig-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-1.png?fit=311%2C367&amp;ssl=1" data-orig-size="311,367" data-comments-opened="1" data-image-meta="{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}" data-image-title="word-image-5750-1" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-1.png?fit=254%2C300&amp;ssl=1" data-large-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-1.png?fit=311%2C367&amp;ssl=1" decoding="async" fetchpriority="high" width="311" height="367" src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-1.png?resize=311%2C367&amp;ssl=1" alt="" sizes="(max-width: 311px) 100vw, 311px" data-recalc-dims="1" data-old-src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-1.png?resize=311%2C367&amp;is-pending-load=1#038;ssl=1" data-lazy-srcset="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-1.png?w=311&amp;ssl=1 311w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-1.png?resize=254%2C300&amp;ssl=1 254w"></figure>








 클릭한 위치에 빨간점이 표시됩니다.




<figure><img data-lazy-fallback="1" data-attachment-id="5752" data-permalink="https://webnautes.blog/5750/word-image-5750-2/" data-orig-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-2.png?fit=311%2C367&amp;ssl=1" data-orig-size="311,367" data-comments-opened="1" data-image-meta="{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}" data-image-title="word-image-5750-2" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-2.png?fit=254%2C300&amp;ssl=1" data-large-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-2.png?fit=311%2C367&amp;ssl=1" decoding="async" width="311" height="367" src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-2.png?resize=311%2C367&amp;ssl=1" alt="" sizes="(max-width: 311px) 100vw, 311px" data-recalc-dims="1" data-old-src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-2.png?resize=311%2C367&amp;is-pending-load=1#038;ssl=1" data-lazy-srcset="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-2.png?w=311&amp;ssl=1 311w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-2.png?resize=254%2C300&amp;ssl=1 254w"></figure>








 스페이스바를 클릭하면 오른쪽 위 점이 아래로 밀린 이미지가 보입니다.




<figure><img data-lazy-fallback="1" data-attachment-id="5753" data-permalink="https://webnautes.blog/5750/word-image-5750-3/" data-orig-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-3.png?fit=311%2C367&amp;ssl=1" data-orig-size="311,367" data-comments-opened="1" data-image-meta="{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}" data-image-title="word-image-5750-3" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-3.png?fit=254%2C300&amp;ssl=1" data-large-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-3.png?fit=311%2C367&amp;ssl=1" decoding="async" width="311" height="367" src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-3.png?resize=311%2C367&amp;ssl=1" alt="" sizes="(max-width: 311px) 100vw, 311px" data-recalc-dims="1" data-old-src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-3.png?resize=311%2C367&amp;is-pending-load=1#038;ssl=1" data-lazy-srcset="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-3.png?w=311&amp;ssl=1 311w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-3.png?resize=254%2C300&amp;ssl=1 254w"></figure>








 다시 스페이스바를 클릭하면 왼쪽아래 점이 오른쪽으로 밀린 이미지가 보입니다.




<figure><img data-lazy-fallback="1" data-attachment-id="5754" data-permalink="https://webnautes.blog/5750/word-image-5750-4/" data-orig-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-4.png?fit=311%2C367&amp;ssl=1" data-orig-size="311,367" data-comments-opened="1" data-image-meta="{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}" data-image-title="word-image-5750-4" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-4.png?fit=254%2C300&amp;ssl=1" data-large-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-4.png?fit=311%2C367&amp;ssl=1" decoding="async" loading="lazy" width="311" height="367" src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-4.png?resize=311%2C367&amp;ssl=1" alt="" sizes="(max-width: 311px) 100vw, 311px" data-recalc-dims="1" data-old-src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-4.png?resize=311%2C367&amp;is-pending-load=1#038;ssl=1" data-lazy-srcset="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-4.png?w=311&amp;ssl=1 311w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-4.png?resize=254%2C300&amp;ssl=1 254w"></figure>








 다시 스페이스바를 누르면 오른쪽 위점이 아래로, 왼쪽 아래점이 오른쪽으로 이동한 이미지가 보입니다.




<figure><img data-lazy-fallback="1" data-attachment-id="5755" data-permalink="https://webnautes.blog/5750/word-image-5750-5/" data-orig-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-5.png?fit=311%2C367&amp;ssl=1" data-orig-size="311,367" data-comments-opened="1" data-image-meta="{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}" data-image-title="word-image-5750-5" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-5.png?fit=254%2C300&amp;ssl=1" data-large-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-5.png?fit=311%2C367&amp;ssl=1" decoding="async" loading="lazy" width="311" height="367" src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-5.png?resize=311%2C367&amp;ssl=1" alt="" sizes="(max-width: 311px) 100vw, 311px" data-recalc-dims="1" data-old-src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-5.png?resize=311%2C367&amp;is-pending-load=1#038;ssl=1" data-lazy-srcset="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-5.png?w=311&amp;ssl=1 311w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-5.png?resize=254%2C300&amp;ssl=1 254w"></figure>








 테스트에 사용한 원본 이미지와 전체 코드입니다.




<figure><img data-lazy-fallback="1" data-attachment-id="5756" data-permalink="https://webnautes.blog/5750/word-image-5750-6/" data-orig-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-6.png?fit=308%2C334&amp;ssl=1" data-orig-size="308,334" data-comments-opened="1" data-image-meta="{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}" data-image-title="word-image-5750-6" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-6.png?fit=277%2C300&amp;ssl=1" data-large-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-6.png?fit=308%2C334&amp;ssl=1" decoding="async" loading="lazy" width="308" height="334" src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-6.png?resize=308%2C334&amp;ssl=1" alt="" sizes="(max-width: 308px) 100vw, 308px" data-recalc-dims="1" data-old-src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-6.png?resize=308%2C334&amp;is-pending-load=1#038;ssl=1" data-lazy-srcset="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-6.png?w=308&amp;ssl=1 308w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/08/word-image-5750-6.png?resize=277%2C300&amp;ssl=1 277w"></figure>







<pre><code>import numpy as np
import cv2


point_list = []
count = 0

def mouse_callback(event, x, y, flags, param):
 global point_list, count, img_original


 # 마우스 왼쪽 버튼 누를 때마다 좌표를 리스트에 저장
 if event == cv2.EVENT_LBUTTONDOWN:
 print("(%d, %d)" % (x, y))
 point_list.append((x, y))

 print(point_list)
 cv2.circle(img_original, (x, y), 3, (0, 0, 255), -1)



cv2.namedWindow('original')
cv2.setMouseCallback('original', mouse_callback)

# 원본 이미지
img_original = cv2.imread('test.png')


while(True):

 cv2.imshow("original", img_original)


 height, width= img_original.shape[:2]


 if cv2.waitKey(1)&amp;0xFF == 32: # spacebar를 누르면 루프에서 빠져나옵니다.
 break



pts1 = np.float32([list(point_list[0]),list(point_list[1]),list(point_list[2])])
pts2 = np.float32([list(point_list[0]),list(point_list[1]),list(point_list[2])])

pts2[1][1] += 100 # 두번째 점의 Y 좌표를 아래로 이동


M = cv2.getAffineTransform(pts1,pts2)

img_result = cv2.warpAffine(img_original, M, (width,height))


cv2.imshow("result1", img_result)
cv2.waitKey(0)



pts1 = np.float32([list(point_list[0]),list(point_list[1]),list(point_list[2])])
pts2 = np.float32([list(point_list[0]),list(point_list[1]),list(point_list[2])])

pts2[2][0] += 100 # 세번째 점의 X 좌료를 오른쪽으로 이동


M = cv2.getAffineTransform(pts1,pts2)

img_result = cv2.warpAffine(img_original, M, (width,height))


cv2.imshow("result2", img_result)
cv2.waitKey(0)



pts1 = np.float32([list(point_list[0]),list(point_list[1]),list(point_list[2])])
pts2 = np.float32([list(point_list[0]),list(point_list[1]),list(point_list[2])])

pts2[1][1] += 100 # 두번째 점의 Y 좌표를 아래로 이동
pts2[2][0] += 50 # 세번째 점의 X 좌료를 오른쪽으로 이동


M = cv2.getAffineTransform(pts1,pts2)

img_result = cv2.warpAffine(img_original, M, (width,height))


cv2.imshow("result3", img_result)
cv2.waitKey(0)


cv2.destroyAllWindows()</code></pre>





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멈춤보단 천천히라도

webnautes

warpAffine 함수를 사용하여 아핀 변환(Affine Transformation)을 구현합니다. 아핀 변환에서 원본 이미지의 모든 평행선은 출력 이미지에서 여전히 평행합니다. 아핀 변환 행렬을 찾으려면 입력 이미지의 3점과 대응하는 출력 이미지의 3점이 필요합니다. getAffineTransform 함수를 사용하면 대응하는 3점 쌍에 대한 변환 행렬을 구할 수 있습니다. warpAffine함수를 사용하여 변환을 실행합니다. 마지막 업데이트 – 2018. 10. 5 왼쪽 위, 오른쪽 위,… 더 보기 »OpenCV Python 강좌 – Affine Transformation
The post OpenCV Python 강좌 – Affine Transformation first appeared on 멈춤보단 천천히라도.

OpenCV Python 강좌 – Affine Transformation

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