python opencv鼠标事件实现画框圈定目标获取坐标信息

# -*- coding: utf-8 -*-"""Created on Tue Dec 27 09:32:02 2016@author: http://blog.csdn.net/lql0716"""import cv2import numpy as npcurrent_pos = Nonetl = Nonebr = None#鼠标事件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)#读取摄像头/视频，然后用鼠标事件画框 def readVideo(pathName, skipFrame): #pathName为视频文件路径，skipFrame为视频的第skipFrame帧 cap = cv2.VideoCapture(0) #读取摄像头 if not cap.isOpened(): #如果为发现摄像头，则按照路径pathName读取视频文件  cap = cv2.VideoCapture(pathName) #读取视频文件，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) #掩码操作，该矩阵与图片大小类型一致，为初始化全0像素值，之后对其操作区域赋值为1即可   if(c==skipFrame):    (a,b) = get_rect(frame, title='get_rect') #鼠标画矩形框    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'): #点击视频窗口，按q键退出   break cap.release() cv2.destroyAllWindows()