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本文实例为大家分享了python-opencv鼠标事件画框圈定目标的具体代码,供大家参考,具体内容如下
在视频/相机中,用鼠标画矩形框,圈定目标,从而获得鼠标的起始坐标点a、终止坐标点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()
本文python opencv鼠标事件实现画框圈定目标获取坐标信息到此结束。透过自己的失败,我们可以认识到自己的不足与局限,了解自己的不成熟之处。透过别人的失败我们同样可以受到很多启发,学到许多真知,从而可以使我们少走很多弯路。小编再次感谢大家对我们的支持!