以下是一个简单的上下文火点算法监测森林火灾的代码示例：

```python import cv2 import numpy as np # 读取图像 img = cv2.imread('forest.jpg') # 转换为灰度图像 gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) # 模糊处理 blur = cv2.GaussianBlur(gray, (7,7), 0) # 边缘检测 edges = cv2.Canny(blur, 50, 150) # 膨胀处理 kernel = np.ones((5,5), np.uint8) dilate = cv2.dilate(edges, kernel, iterations=1) # 查找轮廓 contours, hierarchy = cv2.findContours(dilate, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE) # 绘制矩形框 for contour in contours: x,y,w,h = cv2.boundingRect(contour) if w > 50 and h > 50: cv2.rectangle(img, (x,y), (x+w,y+h), (0,255,0), 2) # 显示图像 cv2.imshow('image', img) cv2.waitKey(0) cv2.destroyAllWindows() ```