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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| import matplotlib.pyplot as plt | |
| import pandas as pd | |
| from scipy.signal import butter, lfilter | |
| def bandpass_filter(signal, lowcut, highcut, fs, order=5): | |
| # Bandpass filter to filter out noise outside of range. | |
| nyq = 0.5 * fs | |
| low = lowcut / nyq | |
| high = highcut / nyq | |
| b, a = butter(order, [low, high], btype='band') | |
| filtered_signal = lfilter(b, a, signal) | |
| return filtered_signal | |
| def integration(data, N): | |
| # Average over the squared data of N points. | |
| # This is done to smooth the data. | |
| integrated = [] | |
| for i in range(len(data) - N): | |
| integrated.append(sum(data[i:i+N])) | |
| return integrated | |
| def peak_finding(integrated, limit): | |
| # If points on both sides have lower values then this point is a peak. | |
| peaks = [] | |
| for i in range(1, len(integrated) - 1): | |
| if integrated[i] > limit and integrated[i-1] < integrated[i] > integrated[i+1]: | |
| peaks.append(i) | |
| return peaks | |
| def R_correction(signal, peaks): | |
| peaks_corrected = [] | |
| for peak in peaks: | |
| cnt = peak | |
| if cnt - 1 < 0 or cnt + 1 >= len(signal): | |
| continue | |
| # If the signal at the current peak index is less than the signal at the previous index, | |
| # iterate backwards until the current signal is greater than the signal at the previous index | |
| while signal[cnt] < signal[cnt - 1] and cnt > 0: | |
| cnt -= 1 | |
| # If the signal at the current peak index is less than the signal at the next index, | |
| # iterate forward until the current signal is greater than the signal at the next index | |
| while signal[cnt] < signal[cnt + 1] and cnt < len(signal) - 1: | |
| cnt += 1 | |
| peaks_corrected.append(cnt) | |
| return peaks_corrected | |
| signal = pd.read_csv('data.csv')['hart'].values | |
| # Filter outside of EKG frequency range of 0.05Hz-100Hz | |
| filtered_data = bandpass_filter(signal, .6, 50, 1000) | |
| derivative_data = [filtered_data[i+1] - filtered_data[i] for i in range(len(filtered_data)-1)] | |
| # Make values positive and changes larger for emphasis. | |
| squared_data = [i ** 2 for i in derivative_data] | |
| # Moving window integration | |
| integrated_data = integration(squared_data, 30) | |
| # Set limit of 50% of the highest value for peak finding | |
| limit = 0.5 * max(integrated_data) | |
| peak_indices = peak_finding(integrated_data, limit) | |
| corrected_peaks = R_correction(signal, peak_indices) | |
| plt.plot(signal, label='EKG Signal') | |
| plt.scatter(corrected_peaks, [signal[i] for i in corrected_peaks], color='red', label='R-peaks') | |
| plt.xlabel('Time') | |
| plt.ylabel('Amplitude') | |
| plt.legend() | |
| plt.show() |
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