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پیدا کردن QRS در ECG با wavelet

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    پیدا کردن QRS در ECG با wavelet

    سلام
    برای پیدا کردن کمپلک متد زیر پیشنهاد شده
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    Most of the energy of the QRS complex lies between 3 Hz
    and 40 Hz [25]. The 3-dB frequencies of the Fourier Transform
    of the wavelets indicate that most of the energy of the QRS
    complex lies between scales of 23 and 24, with the largest at 24.
    The energy decreases if the scale is larger then 24. The energy
    of motion artifacts and baseline wander (i.e., noise) increases
    for scales greater then 25. Therefore, we choose to use
    characteristic scales of 21 to 24 for the wavelet.
    The detection of the QRS complex is based on modulus
    maxima of the Wavelet Transform. This is because modulus
    maxima and zero crossings of the Wavelet Transform
    correspond to the sharp edges in the signal. The QRS complex
    produces two modulus maxima with opposite signs, with a zero
    crossing between them shown in Fig. 7. Therefore, detection
    rules (thresholds) are applied to the Wavelet Transform of the
    ECG signal. The Q and S point occurs about the R Peak with in
    0.1second. The left point denoted the Q point and the right
    one denotes the S point. Calculating the distance from zero
    point or close to zero of left side of R Peak within the threshold
    limit denotes Q point. Similarly the right side denotes the S
    point.
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