python-opencv tutorial(5)

python-opencvチュートリアル(5)

今回は文字列の書き込みとマウスイベントの処理です。

GitHubリポジトリ
https://github.com/kyatou/python-opencv_tutorial

文字列の書き込み

'''
python-opencv tutorial
Annotate message to image.
Usage:
  09_annotate.py imagename
'''

import cv2
import sys

argvs=sys.argv
if (len(argvs) != 2):
    print 'Usage: # python %s imagefilename' % argvs[0]
    quit()
 
imagefilename = argvs[1]
try:
     img=cv2.imread(imagefilename, 1)
except:
     print 'faild to load %s' % imagefilename
     quit()


#putText(...)
#    putText(img, text, org, fontFace, fontScale, color[, thickness[, linetype[, bottomLeftOrigin]]]) -> None

msg='HELLO,OpenCV!'
location=(0,30)

fontface=cv2.FONT_HERSHEY_PLAIN
fontscale=1.0
color=(255,190,0) #sky blue
cv2.putText(img,msg,location,fontface,fontscale,color)


#big size
fontscale=2.0
location=(0,img.shape[0]/2)
thickness=2
cv2.putText(img,msg,location,fontface,fontscale,color,thickness)

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

文字列の書き込み

マウスイベントの処理

'''
python-opencv tutorial
Example of mouse callback
draw a circle or rectangle to clicked point.

Usage:
  10_mouse_callback.py imagename
'''

import cv2
import sys

argvs=sys.argv
if (len(argvs) != 2):
    print 'Usage: # python %s imagefilename' % argvs[0]
    quit()
 
imagefilename = argvs[1]
try:
     img=cv2.imread(imagefilename, 1)
except:
     print 'faild to load %s' % imagefilename
     quit()

usage='left click to draw a circle.\nright click to draw a rectangle.\n'
usage=usage+'press any key to exit.'
print(usage)



windowName="mouse"
cv2.namedWindow(windowName)
  
def onMouse(event, x, y, flags, param):
     """
        Mouse event callback function.
        left click -> draw circle
        right click -> draw rectangle
     """ 
     if event == cv2.EVENT_MOUSEMOVE:return 
 
     if event == cv2.EVENT_LBUTTONDOWN:
         center=(x,y) 
         radius=10
         color=(255,255,0)
         cv2.circle(img,center,radius,color)
     
     if event == cv2.EVENT_RBUTTONDOWN:
         rect_start=(x-10,y-10)
         rect_end=(x+10,y+10)
         color=(100,255,100)
         cv2.rectangle(img,rect_start,rect_end,color)

     cv2.imshow(windowName,img)


#setMouseCallback(...)
#    setMouseCallback(windowName, onMouse [, param]) -> None
cv2.setMouseCallback(windowName,onMouse)

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

マウスイベントの処理

ではまた。