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在日常生活，总是离不开火，有时候我们需要预防火灾发生，但是我们又不可能一直盯着，这时候我们就需要一款程序帮我们盯着，一旦发生火灾从而告知我们，今天就带大家编写这么一款应用。

安装需要的库

pip install opencv-python

代码实现

import cv2         # Library for openCV# To access xml file which includes positive and negative images of fire. 
# (Trained images) File is also provided with the code.
fire_cascade = cv2.CascadeClassifier('fire_detection.xml') vid = cv2.VideoCapture(0)while(True):# Value in ret is True # To read video frameret, frame = vid.read() # To convert frame into gray colorgray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) # to provide frame resolutionfire = fire_cascade.detectMultiScale(frame, 1.2, 5) ## to highlight fire with square for (x,y,w,h) in fire:cv2.rectangle(frame,(x-20,y-20),(x+w+20,y+h+20),(255,0,0),2)roi_