本文實例為大家分享了python-opencv鼠標事件畫框圈定目標的具體代碼，供大家參考，具體內(nèi)容如下

在視頻/相機中，用鼠標畫矩形框，圈定目標，從而獲得鼠標的起始坐標點a、終止坐標點b

# -*- coding: utf-8 -*-

"""

Created on Tue Dec 27 09:32:02 2016

@author: http://blog.csdn.net/lql0716

"""

import cv2

import numpy as np

current_pos = None

tl = None

br = None

#鼠標事件

def get_rect(im, title='get_rect'): # (a,b) = get_rect(im, title='get_rect')

mouse_params = {'tl': None, 'br': None, 'current_pos': None,

'released_once': False}

cv2.namedWindow(title)

cv2.moveWindow(title, 100, 100)

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

param['current_pos'] = (x, y)

if param['tl'] is not None and not (flags & cv2.EVENT_FLAG_LBUTTON):

param['released_once'] = True

if flags & cv2.EVENT_FLAG_LBUTTON:

if param['tl'] is None:

param['tl'] = param['current_pos']

elif param['released_once']:

param['br'] = param['current_pos']

cv2.setMouseCallback(title, onMouse, mouse_params)

cv2.imshow(title, im)

while mouse_params['br'] is None:

im_draw = np.copy(im)

if mouse_params['tl'] is not None:

cv2.rectangle(im_draw, mouse_params['tl'],

mouse_params['current_pos'], (255, 0, 0))

cv2.imshow(title, im_draw)

_ = cv2.waitKey(10)

cv2.destroyWindow(title)

tl = (min(mouse_params['tl'][0], mouse_params['br'][0]),

min(mouse_params['tl'][1], mouse_params['br'][1]))

br = (max(mouse_params['tl'][0], mouse_params['br'][0]),

max(mouse_params['tl'][1], mouse_params['br'][1]))

return (tl, br) #tl=(y1,x1), br=(y2,x2)

#讀取攝像頭/視頻，然后用鼠標事件畫框

def readVideo(pathName, skipFrame): #pathName為視頻文件路徑，skipFrame為視頻的第skipFrame幀

cap = cv2.VideoCapture(0) #讀取攝像頭

if not cap.isOpened(): #如果為發(fā)現(xiàn)攝像頭，則按照路徑pathName讀取視頻文件

cap = cv2.VideoCapture(pathName) #讀取視頻文件，如pathName='D:/test/test.mp4'

c = 1

while(cap.isOpened()):

ret, frame = cap.read()

gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

if(c>=skipFrame):

mask = np.zeros(gray.shape, dtype=np.uint8) #掩碼操作，該矩陣與圖片大小類型一致，為初始化全0像素值，之后對其操作區(qū)域賦值為1即可

if(c==skipFrame):

(a,b) = get_rect(frame, title='get_rect') #鼠標畫矩形框

img01, img02 = frame, frame

gray01, gray02 = gray, gray

else:

img1, img2 = prev_frame, frame

gray1, gray2 = prev_frame, frame

cv2.imshow('frame', frame)

c = c + 1

prev_gray = gray

prev_frame = frame

if cv2.waitKey(1) & 0xFF == ord('q'): #點擊視頻窗口，按q鍵退出

break

cap.release()

cv2.destroyAllWindows()

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