错误已经改过来了,请问可以帮我去除基线漂移并滤波吗
时间: 2024-03-16 13:44:19 浏览: 121
可以的,你可以使用以下代码来去除基线漂移并滤波:
```python
import wfdb
import numpy as np
import matplotlib.pyplot as plt
import pywt
# 读取一个ECG信号
record = wfdb.rdrecord('ptb-xl/database/records100/00000/00001_lr')
signal = record.p_signal[:, 0]
# 设置小波滤波器
wavelet = pywt.Wavelet('db4')
# 小波去噪
# 计算信号的标准差
sigma = np.median(np.abs(signal)) / 0.6745
# 计算阈值
threshold = sigma * np.sqrt(2 * np.log(len(signal)))
# 应用小波阈值
coeffs = pywt.wavedec(signal, wavelet, level=5)
for i in range(1, len(coeffs)):
coeffs[i] = pywt.threshold(coeffs[i], threshold)
denoised_signal = pywt.waverec(coeffs, wavelet)
# 中值滤波去除基线漂移
baseline = signal - denoised_signal
window_size = 101
padded = np.pad(baseline, int(window_size / 2), mode='edge')
baseline = np.convolve(padded, np.ones((window_size,))/window_size, mode='valid')
clean_signal = signal - baseline
# 绘制原始信号,滤波后的信号以及去除基线漂移后的信号
plt.figure(figsize=(10, 6))
plt.plot(signal, label='Original Signal')
plt.plot(denoised_signal, label='Denoised Signal')
plt.plot(clean_signal, label='Clean Signal')
plt.legend()
plt.show()
```
这段代码首先使用小波去噪来滤波信号,然后使用中值滤波来去除基线漂移。最后绘制原始信号,滤波后的信号以及去除基线漂移后的信号。你可以根据需要修改中值滤波的窗口大小或者调整小波去噪的参数。
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