python+opencv鼠标操作以及制作调色板并画图

鼠标操作：

#!/usr/bin/env python

import numpy as np
import cv2

events=[i for i in dir(cv2) if 'EVENT' in i]
#events=[i for i in dir(cv2)]
print events

def draw_circle(event, x, y, flags, param):
if event == cv2.EVENT_LBUTTONDBLCLK:
cv2.circle(img, (x, y), 100, (255,0,0), -1)

img = np.zeros((512,512,3), np.uint8)
cv2.namedWindow('image')
cv2.setMouseCallback('image', draw_circle)

while(True):
cv2.imshow('image', img)
if cv2.waitKey(20)&0xff == 27:
break

cv2.deltroyAllWindows()

跟随鼠标移动进行绘制矩形或者画圆

#!/usr/bin/env python

import numpy as np
import cv2

drawing = False
mode = True
ix, iy = -1, -1

def draw_circle(event, x, y, flags, param):
global ix, iy, drawing, mode

if event == cv2.EVENT_LBUTTONDOWN:
print 'left button down'
drawing = True
ix, iy = x,y
#elif event == cv2.EVENT_MOUSEMOVE and flags == cv2.EVENT_FLAG_LBUTTON:
elif event == cv2.EVENT_MOUSEMOVE:
print 'mouse move'
if drawing == True:
if mode == True:
cv2.rectangle(img, (ix, iy), (x,y), (0,255,0), -1)
else:
cv2.circle(img, (x, y), 10, (255,0,0), -1)
elif event == cv2.EVENT_LBUTTONUP:
print 'left button up'
drawing = False

img = np.zeros((512,512,3), np.uint8)
cv2.namedWindow('image')
cv2.setMouseCallback('image', draw_circle)

while(True):
cv2.imshow('image', img)
k = cv2.waitKey(1)&0xff
if k == ord('m'):
print 'you typed key m'
mode = not mode
elif k == 27:
break

制作调色板：

#!/usr/bin/env python

import numpy as np
import cv2

def def_func(x):
pass

img = np.zeros((512,512,3), np.uint8)
cv2.namedWindow('image')

cv2.createTrackbar('R','image',0,255,def_func)
cv2.createTrackbar('G','image',0,255,def_func)
cv2.createTrackbar('B','image',0,255,def_func)

switch = '0:OFF\n1:ON'
cv2.createTrackbar(switch,'image',0,1,def_func)

while(True):
cv2.imshow('image', img)
k = cv2.waitKey(1)&0xff
if k == 27:
break
r = cv2.getTrackbarPos('R', 'image')
g = cv2.getTrackbarPos('G', 'image')
b = cv2.getTrackbarPos('B', 'image')
s = cv2.getTrackbarPos(switch, 'image')

if s == 0:
img[:] = 0
else:
img[:] = [b,g,r]

cv2.destroyAllWindows()

制作一个画板，可以选择颜色，然后移动鼠标画图：

#!/usr/bin/env python

import numpy as np
import cv2

drawing = False
mode = True
ix, iy = -1, -1

def def_func(x):
pass

def draw_circle(event, x, y, flags, param):
r = cv2.getTrackbarPos('R', 'image')
g = cv2.getTrackbarPos('G', 'image')
b = cv2.getTrackbarPos('B', 'image')
color = (b,g,r)

global ix, iy, drawing, mode

if event == cv2.EVENT_LBUTTONDOWN:
print 'left button down'
drawing = True
ix, iy = x,y
#elif event == cv2.EVENT_MOUSEMOVE and flags == cv2.EVENT_FLAG_LBUTTON:
elif event == cv2.EVENT_MOUSEMOVE:
print 'mouse move'
if drawing == True:
if mode == True:
cv2.rectangle(img, (ix, iy), (x,y), color, -1)
else:
cv2.circle(img, (x, y), 10, color, -1)
elif event == cv2.EVENT_LBUTTONUP:
print 'left button up'
drawing = False

img = np.zeros((512,512,3), np.uint8)

cv2.namedWindow('image')

cv2.createTrackbar('R','image',0,255,def_func)
cv2.createTrackbar('G','image',0,255,def_func)
cv2.createTrackbar('B','image',0,255,def_func)

cv2.setMouseCallback('image', draw_circle)

while(True):
cv2.imshow('image', img)
k = cv2.waitKey(1)&0xff
if k == ord('m'):
print 'you typed key m'
mode = not mode
elif k == 27:
break

cv2.destroyAllWindows()