「信号处理」Mean均值滤波器C++两种实现方法

        均值滤波器原理简单，小白最近完成了固定滤波序列长度和变长度的两种C++实现，对于数组变长度的技术实现，使用了方法。

        均值滤波的原理顾名思义，取一段长度的平均值作为当前值。

1. 定长数组

class Filter{
    public:
            Filter(void);
            ~Filter(void);
            double Mean(double signal, int impact);
    private:
            int cycles, mean_num;
            double array[5];
            double Mean_o;
}


double Filter::Mean(double signal, int impact){
    mean = impact; //注意：此处impact值与数组长度相等情况最佳，应等于5。
    if (cycles > mean_num){
        for(int i=2; i < mean_num; i++){
	    array2[mean_num+2-i] = array2[mean_num+1-i];
            }
        array[1] = signal;
        double temp = 0;
        for(int i=0; i < Mean_num; i++){
            temp = temp + array[i];
	    }
        Mean_o = temp / Mean_num;
    }
    else{
        for(int i=2; i < Mean_num2; i++){
            array[Mean_num2+2-i] = array2[Mean_num2+1-i];
            }
	    array[i] = signal;
    }
    cycles++;
    return mean_o;
}

2.变长数组

class Filter{
    public:
            Filter(void);
            ~Filter(void);
            double Mean(double signal, int impact);
    private:
            int cycles, mean_num;
            vectorarray;
            double Mean_o;
}


double Filter::Mean(double signal, int impact){
    if (cycles > impact){
	array.push_back(signal);
	array.erase(array.begin());
	double temp = 0;
	for(int i=0; i < impact; i++){
	    temp = temp + array[i];
	}
	Mean_o = temp / impact;
    }
    else{
	array.push_back(signa);
	Mean_o = array[cycles-1];
	}
	cycles++;
    return mean_o;
}