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python怎么装opencv(Python基于opencv实现的简单画板功能示例)

更多 时间:2022-01-17 01:42:42 类别:脚本大全 浏览量:529

python怎么装opencv

Python基于opencv实现的简单画板功能示例

本文实例讲述了python基于opencv实现的简单画板功能。分享给大家供大家参考,具体如下:

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  • import cv2
  • import numpy as np
  • drawing = false # true if mouse is pressed
  • ix,iy = -1,-1
  • def nothing(x):
  •   pass
  • # mouse callback function
  • def draw_circle(event,x,y,flags,param):
  •   global ix,iy,drawing
  •   g = param[0]
  •   b = param[1]
  •   r = param[2]
  •   shape = param[3]
  •   if event == cv2.event_lbuttondown:
  •     drawing = true
  •     ix,iy = x,y
  •   elif event == cv2.event_mousemove:
  •     if drawing == true:
  •       if shape == 0:
  •         cv2.rectangle(img,(ix,iy),(x,y),(g,b,r),-1)
  •       else:
  •         cv2.circle(img,(x,y),5,(g,b,r),-1)
  •   elif event == cv2.event_lbuttonup:
  •     drawing = false
  •     if shape == 0:
  •       cv2.rectangle(img,(ix,iy),(x,y),(g,b,r),-1)
  •     else:
  •       cv2.circle(img,(x,y),5,(g,b,r),-1)
  • # create a black image, a window
  • img = np.zeros((300,512,3), np.uint8)
  • cv2.namedwindow('image')
  • # create trackbars for color change
  • cv2.createtrackbar('r','image',0,255,nothing)
  • cv2.createtrackbar('g','image',0,255,nothing)
  • cv2.createtrackbar('b','image',0,255,nothing)
  • # create switch for on/off functionality
  • switch1 = '0 : off \n1 : on'
  • switch2 = '0: rectangle \n1: line '
  • cv2.createtrackbar(switch1, 'image',0,1,nothing)
  • cv2.createtrackbar(switch2, 'image',0,1,nothing)
  • while(1):
  •   cv2.imshow('image',img)
  •   k = cv2.waitkey(1) & 0xff
  •   # get current positions of four trackbars
  •   if k == 27:
  •       break
  •   r = cv2.gettrackbarpos('r','image')
  •   g = cv2.gettrackbarpos('g','image')
  •   b = cv2.gettrackbarpos('b','image')
  •   shape = cv2.gettrackbarpos(switch2,'image')
  •   s = cv2.gettrackbarpos(switch1,'image')
  •   if s == 0:
  •     img[:] = 0
  •   else:
  •     if k == 27:
  •       break
  •     cv2.setmousecallback('image',draw_circle,(b,g,r,shape))
  • cv2.destroyallwindows()
  • 运行效果:

    python怎么装opencv(Python基于opencv实现的简单画板功能示例)

    希望本文所述对大家python程序设计有所帮助。

    原文链接:https://blog.csdn.net/xuminnju/article/details/79588161

    标签:Python OpenCV 画板
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