enum class  detect_method : unsigned char  {

    fft = 1,     // Fast Fourier Transform (FFT)
    iqr = 2,     // Inter-Quartile Range (IQR)
    lof = 3,     // Local Outlier Factor (LOF)
    hampel = 4,  // Hampel Filter
    zscore = 5,  // Z-Score method
};