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| Heart Rate Measurements Using Principal Component Analysis and Overlapping Histgram Based on Video Signal |
| Zhao Yantao*, Fu Meiling, Wang Bin, Zhang Xuguang, Li Xiaoli |
| (School of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China) |
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Abstract The technique photo plethysmo graphy (PPG) shows that the light intensity has a periodical change with the change of blood volume. So the facial skin color will change a little along with the pulse. The technique can be used to measuring heart rate with many advantages, such as low cost, no contact and no electrode. This is helpful to remote medical monitoring and other fields. In this paper ordinary camera was used to collect human face videos. The principle components was extracted by calculating average values of green components on the three face regions through principal component analysis (PCA),and the noise was eliminated. The smoothing methods was used after PCA, and the detrending method was utilized in this paper. The peaks of signal were detected by the peak detecting method that was proposed in this work, which reduced detection of wrong peaks. Then the method of overlapping histogram statistics was used to get heart rate through calculating the intervals between peaks of the pulse signal. The proposed method was compared with results obtained from CMS-50D Finger clip type pulse oximeter of CONTEC company(measurement samples was 170)and MP150 multi-channel physiological recorder of BIOPAC company(measurement samples was 110)with the statistics method of Bland-Altma. Comparison of the results from CMS-50D with that from the proposed methods showed that the overlapping histogram statistics method reduced the standard deviations of the conformance assessment form 12.4 beats/min to 8 beats/min. Comparison of the results from MP150 with that from the proposed methods showed that the mean and the standard deviations of the conformance assessment was 1.81 and 3.18 bpm respectively, indicating the results were in good consistency.
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Received: 12 October 2014
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