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RPPG signal preprocessing method and system for video heart rate detection

A preprocessing and signal technology, applied in the field of biomedical signal processing, can solve problems such as uneven time intervals, and achieve the effect of improving the signal-to-noise ratio

Active Publication Date: 2021-08-13
NANJING UNIV OF SCI & TECH
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Problems solved by technology

According to the captured video and its corresponding frame time data, it is found that the time interval between video frames is not uniform

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  • RPPG signal preprocessing method and system for video heart rate detection
  • RPPG signal preprocessing method and system for video heart rate detection
  • RPPG signal preprocessing method and system for video heart rate detection

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Embodiment Construction

[0046] to combine figure 1 , the present invention provides a rPPG signal preprocessing method for video heart rate detection. After the original rPPG signal is extracted through the facial region of interest ROI, the specific preprocessing steps are as follows:

[0047] Step 1, according to the time corresponding to each frame of the video (millisecond level), perform linear interpolation on the values ​​of two adjacent frames of the original rPPG signal, extract the interpolated signal at equal intervals according to the frame rate, and reconstruct a uniformly sampled rPPG signal. to combine figure 2 Schematic diagram of linear interpolation and equal interval extraction, the output signal has the characteristics of uniform sampling.

[0048] Step 1.1 According to the time corresponding to each frame of the video recorded when shooting the video, perform linear interpolation at the integer millisecond position between two adjacent values ​​of the original rPPG signal, and ...

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Abstract

The invention discloses an rPPG signal preprocessing method and system in video heart rate detection. The method comprises the steps: carrying out the numerical linear interpolation between adjacent points of a signal according to the recorded corresponding time of a video frame because the time interval between video frames shot by a camera is not uniform, carrying out the equal-interval sampling of the whole signal after interpolation according to a frame rate, and reconstructing the signal; removing trend components in the reconstructed signal by using an L1 detrending filtering algorithm; and shaping the signal by using the continuity and segment smoothing characteristic of the signal on the phase, so that the periodicity on the time domain is stronger, and the main lobe on the frequency domain is more prominent. According to the rPPG signal preprocessing method, the signal-to-noise ratio is improved in a complex scene, and the accuracy of heart rate detection is enhanced.

Description

technical field [0001] The invention belongs to the field of biomedical signal processing, and in particular relates to a rPPG signal preprocessing method and system for video heart rate detection. Background technique [0002] As one of the most important parameters of human vital signs, heart rate has been paid more and more attention with the improvement of people's living standards and awareness of cardiovascular diseases. [0003] The traditional heart rate detection method has a lot of inconvenience. It needs to use electrodes to touch the human skin and cannot realize real-time detection. Non-contact heart rate detection is a low-invasive detection method that overcomes the shortcomings of traditional heart rate detection. Face video heart rate detection, as one of the non-contact heart rate detection technologies, only extracts heart rate-related rPPG (remote Photoplethysmograph) signals from the facial video collected by the camera device. This detection method do...

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Application Information

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IPC IPC(8): A61B5/024A61B5/00
CPCA61B5/024A61B5/7203A61B5/7225
Inventor 伏长虹任杰洪弘
Owner NANJING UNIV OF SCI & TECH
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