标签:None end 05 cv2 pos start window 图像 绘制
绘制基本的图形
- 直线line()
- 矩形rectangle()
- 圆circle()
- 椭圆ellipse()
- 多边形polylines()
- 填充的多边形fillPoly()
- 文本putText()
示例:动态绘制一个矩形框(通过键盘选择矩形、圆),要求实时性,基本不延迟
import cv2
import numpy as np
bg = cv2.imread('./images/bg.jpg')
print(bg.shape)
# 绘制背景色
window_name = 'window'
cv2.namedWindow(window_name, cv2.WINDOW_NORMAL)
cv2.resizeWindow(window_name, (800, 450))
cv2.imshow(window_name, bg)
start_pos = None
end_pos = None
button_status = 0
def mouse_callback(event, x, y, flags, userdata):
global start_pos, end_pos, button_status
if event == cv2.EVENT_LBUTTONDOWN:
start_pos = (x, y)
end_pos = (x, y)
button_status = 1
if event == cv2.EVENT_LBUTTONUP:
end_pos = (x, y)
button_status = 0
if event == cv2.EVENT_MOUSEMOVE and button_status==1:
end_pos = (x, y)
graphic_shape = 1
cv2.setMouseCallback(window_name, mouse_callback)
# 鼠标动态绘制
while True:
key = cv2.waitKey(5)
if key == ord('q'):
break
elif key == ord('r'):
graphic_shape = 1 # 表示矩形
start_pos = None
end_pos = None
elif key == ord('c'):
graphic_shape = 2 # 表示圆
start_pos = None
end_pos = None
bg2 = bg.copy()
if graphic_shape == 1 and start_pos is not None and end_pos is not None:
cv2.rectangle(bg2, start_pos, end_pos, (0, 0, 255), 3)
elif graphic_shape == 2 and start_pos is not None and end_pos is not None:
r = int(((end_pos[0]-start_pos[0])**2+(end_pos[1]-start_pos[1])**2)**0.5)
cv2.circle(bg2, start_pos, r, (0, 0, 255), 3)
cv2.imshow(window_name, bg2)
cv2.destroyAllWindows()
标签:None,end,05,cv2,pos,start,window,图像,绘制 来源: https://www.cnblogs.com/TheoryDance/p/16406981.html
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