opencv例項練習

利用滑鼠畫矩形或者線段

import cv2 as cv

import numpy as np

drawing = false # 如果 mode為true繪製矩形。按下 'm』變成繪製曲線。 預設是false 滑鼠按下是true

mode = true

ix, iy = -1,-1

def draw_circle(event,x, y, flags, param):

global ix, iy, drawing, mode

if event == cv.event_mbuttondown: # cv.event_mbuttondown = , 中鍵按下

drawing = true

ix, iy = x, y

elif event == cv.event_mousemove:  #  cv.event_mousemove , 滑鼠移動

if drawing == true:
if mode == true:
cv.rectangle(img, (ix, iy), (x, y), (0, 255 ,0), -1)
else:
cv.circle(img,(x, y),10,(0, 0, 255), -1)
elif event == cv.event_lbuttonup:  #  cv.event_lbuttonup , 左鍵釋放
drawing = false
if mode == true:
cv.rectangle(img,(ix, iy), (x, y),(0, 255, 0), -1)
else:
cv.circle(img,(x, y), 10,(0, 0, 255), -1)

cv.namedwindow(『image』)

cv.setmousecallback(『image』,draw_circle)

while(1):

cv.imshow(『image』, img)

k = cv.waitkey(1)&0xff

if k == ord(『m』):

mode = not mode

elif k == 27:

break

輸出結果：

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