本文实例讲述了Python图像处理之简单画板实现方法。分享给大家供大家参考,具体如下:
Python图像处理也是依赖opencv的Python接口实现的,Python语言简单易懂,简洁明了。本次实现画板涂鸦,一个是在里面画矩形,还有画线。其他也都可以扩展,本案例只做例程,思路是对鼠标事件的处理,以及滚动条调节颜色处理。鼠标事件就包含有左键按下,以及释放事件的处理。
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import cv2
import numpy as np
# null function
def nothing(x):
pass
Drawing = False
Mode = True
IX,IY = - 1 , - 1
def drawCircle(Event,X,Y,Flags,Param):
R = cv2.getTrackbarPos( 'R' , 'Image' )
G = cv2.getTrackbarPos( 'G' , 'Image' )
B = cv2.getTrackbarPos( 'B' , 'Image' )
#get color value
Color = (B,G,R);
global IX,IY,Drawing,Mode
if Event = = cv2.EVENT_LBUTTONDOWN:
Drawing = True
IX,IY = X,Y
elif Event = = cv2.EVENT_MOUSEMOVE and Flags = = cv2.EVENT_FLAG_LBUTTON:
if Drawing = = True :
if Mode = = True :
cv2.rectangle(Img,(IX,IY),(X,Y),Color, - 1 )
else :
cv2.circle(Img,(X,Y), 3 ,Color, - 1 );
elif Event = = cv2.EVENT_LBUTTONUP:
Drawing = False
#create image with 3 chanels
Img = np.zeros(( 660 , 660 , 3 ),np.uint8)
#create window
cv2.namedWindow( 'Image' )
#create track bar, range for 0~255
cv2.createTrackbar( 'R' , 'Image' , 0 , 255 ,nothing)
cv2.createTrackbar( 'G' , 'Image' , 0 , 255 ,nothing)
cv2.createTrackbar( 'B' , 'Image' , 0 , 255 ,nothing)
#set mouse ack
cv2.setMouseCallback( 'Image' ,drawCircle)
while ( 1 ):
cv2.imshow( 'Image' ,Img)
k = cv2.waitKey( 10 )& 0xFF
#switch draw mode
if k = = ord ( 'm' ):
Mode = not Mode
elif k = = 27 :
break
#you must destroy all of sources
cv2.destroyAllWindows()
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最后的效果图如下:
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/Touch_Dream/article/details/52199442