03. 도형 그리기

In [1]:

from Custom.mediahelper import show_image_with_pil # 개발자 정의 모듈

3. 도형 그리기¶

In [2]:

import cv2
import numpy as np

# 세로 480 x 가로 640, 3 Channel (RGB) 에 해당하는 스케치북 만들기
img = np.zeros((480,640,3), dtype = np.uint8)

# OpenCV 에서는 RGB 아니고 BGR임
#img[:] = (255,255,255) # 전체 공간을 흰색으로 채우기
img

cv2.imshow('img', img)
cv2.waitKey(0)
cv2.destroyAllWindows()

show_image_with_pil(img, 'img')

'img'

일부 영역 색칠¶

In [3]:

import cv2
import numpy as np

img = np.zeros((480,640,3), dtype = np.uint8)

img[0:200, 200:600] = (255,255,255) 
    # 세로   # 가로

cv2.imshow('img', img)
cv2.waitKey(0)
cv2.destroyAllWindows()

show_image_with_pil(img, 'img')

'img'

배열 확인¶

In [4]:

print(np.zeros(5)) # 1행 5열
print("-" * 20)

print(np.zeros((2,5))) # 2행 5열
print("-" * 20)

print(np.zeros((2,5,4))) # (5행 4열) * 2
print("-" * 20)

shape = np.zeros((4,6,3))
shape[0:2,4:6] = (255,255,255)
print(shape)

[0. 0. 0. 0. 0.]
--------------------
[[0. 0. 0. 0. 0.]
 [0. 0. 0. 0. 0.]]
--------------------
[[[0. 0. 0. 0.]
  [0. 0. 0. 0.]
  [0. 0. 0. 0.]
  [0. 0. 0. 0.]
  [0. 0. 0. 0.]]

 [[0. 0. 0. 0.]
  [0. 0. 0. 0.]
  [0. 0. 0. 0.]
  [0. 0. 0. 0.]
  [0. 0. 0. 0.]]]
--------------------
[[[  0.   0.   0.]
  [  0.   0.   0.]
  [  0.   0.   0.]
  [  0.   0.   0.]
  [255. 255. 255.]
  [255. 255. 255.]]

 [[  0.   0.   0.]
  [  0.   0.   0.]
  [  0.   0.   0.]
  [  0.   0.   0.]
  [255. 255. 255.]
  [255. 255. 255.]]

 [[  0.   0.   0.]
  [  0.   0.   0.]
  [  0.   0.   0.]
  [  0.   0.   0.]
  [  0.   0.   0.]
  [  0.   0.   0.]]

 [[  0.   0.   0.]
  [  0.   0.   0.]
  [  0.   0.   0.]
  [  0.   0.   0.]
  [  0.   0.   0.]
  [  0.   0.   0.]]]

직선¶

직선의 종류 (line type)

1. cv2.LINE_4 : 상하좌우 4 방향으로 연결된 선
2. cv2.LINE_8 : 대각선을 포함한 8 방향으로 연결된 선 (기본값)
3. cv2.LINE__AA : 부드러운 선(anti-aliasing)

In [5]:

import cv2
import numpy as np

img = np.zeros((480,640,3), dtype = np.uint8)

COLOR = (0, 255, 255) # BGR
THIKNESS = 3 # 두께

cv2.line(img , (50, 100), (480, 50), COLOR, THIKNESS, cv2.LINE_8) # 시작점 좌표(50,100) 끝점 좌표(480, 50)
cv2.line(img , (50, 200), (480, 150), COLOR, THIKNESS, cv2.LINE_4)
cv2.line(img , (50, 300), (480, 250), COLOR, THIKNESS, cv2.LINE_AA)


cv2.imshow('img', img)
cv2.waitKey(0)
cv2.destroyAllWindows()

show_image_with_pil(img, 'img')

'img'

원¶

In [6]:

import cv2
import numpy as np

img = np.zeros((480,640,3), dtype = np.uint8)

COLOR = (255, 255, 0) # BGR
RADIUS = 50 # 반지름
THIKNESS = 3 # 두께

cv2.circle(img, (200, 100), RADIUS, COLOR, THIKNESS, cv2.LINE_8) # 속이 빈 원
cv2.circle(img, (250, 150), RADIUS, COLOR, cv2.FILLED, cv2.LINE_8) # 속이 꽉찬 원
#cv2.circle(img, (250, 150), RADIUS, COLOR, -1, cv2.LINE_8) # 속이 꽉찬 원


cv2.imshow('img', img)
cv2.waitKey(0)
cv2.destroyAllWindows()

show_image_with_pil(img, 'img')

'img'

사각형¶

In [7]:

import cv2
import numpy as np

img = np.zeros((480,640,3), dtype = np.uint8)

COLOR = (0, 255, 0) # BGR
THIKNESS = 3 # 두께

cv2.rectangle(img, (100, 100), (150,200), COLOR, THIKNESS, cv2.LINE_8) # 시작점 좌표(100,100) 대각 끝점 좌표(150, 200)
cv2.rectangle(img, (250, 250), (350,300), COLOR, cv2.FILLED, cv2.LINE_8)


cv2.imshow('img', img)
cv2.waitKey(0)
cv2.destroyAllWindows()

show_image_with_pil(img, 'img')

'img'

다각형¶

In [8]:

import cv2
import numpy as np

img = np.zeros((480,640,3), dtype = np.uint8)

COLOR = (0, 0, 255) # BGR
THIKNESS = 3 # 두께

pts1 = np.array([[100,100],[200,100],[100,200]]) # 세개 꼭짓점 좌표
pts2 = np.array([[100,100],[200,100],[100,200]]) + 100
print(pts2)

#cv2.polylines(img, [pts1,pts2], False, COLOR, THIKNESS, cv2.LINE_AA) # 다각형
#cv2.polylines(img, [pts1,pts2], True, COLOR, THIKNESS, cv2.LINE_AA) # 닫힌 다각형
cv2.fillPoly(img, [pts1,pts2], COLOR, cv2.LINE_AA) # 꽉찬 다각형



cv2.imshow('img', img)
cv2.waitKey(0)
cv2.destroyAllWindows()

show_image_with_pil(img, 'img')

[[200 200]
 [300 200]
 [200 300]]
'img'