利用opencv实现烟雾检测，利用的特征是：在［0.625Hz，2.5Hz］带宽的频率范围内，监 测图像序列的灰度值通过一个二阶的滤波器后，子信号的频率值的变化，观察其峰峰值的个数，当峰值个数超过2次的时候即可判定为烟雾点-Smoke detection using opencv realized, is characterized by the use: In the [0.625Hz, 2.5Hz] bandwidth, frequency range, the gray value o

角点检测算法是一种基于信号的点特征提取算法，Harris角点检测算子是通过Taylor级数展开法扩展了思路，计算窗口沿任何方向移动后的灰度变换情况，利用数学解析式来进一步确定特征点。-Corner detection algorithm is a point-based feature extraction algorithm signal, Harris corner detection operator is expanded by Taylor series expansion ideas