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Method for improving face video heart rate detection by using illumination equalization method

A video and heart rate technology, which is applied in the field of improving face video heart rate detection by using light equalization method, can solve problems such as the impact of detection results, achieve the effects of improving brightness, reducing average error and standard deviation, and improving measurement accuracy

Active Publication Date: 2021-03-16
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

At present, non-contact heart rate detection requires a relatively stable environment to obtain accurate results, and factors such as changes in light will have a negative impact on the detection results

Method used

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  • Method for improving face video heart rate detection by using illumination equalization method
  • Method for improving face video heart rate detection by using illumination equalization method
  • Method for improving face video heart rate detection by using illumination equalization method

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Embodiment

[0020] like figure 1 As shown, the present invention utilizes illumination equalization method to improve the method for face video heart rate detection, comprises the following steps:

[0021] S1. Use a visible light camera to acquire face video images, keep still in front of the camera, reduce shaking, and maintain the light brightness of the collection environment. The camera uses a high-definition camera with 12 million pixels and a maximum resolution of 1920*1080;

[0022] S2, according to the human face video image collected in step S1, utilize multi-task convolutional neural network (MTCNN, Multi-task convolutional neural network) to complete the detection and positioning of human face, eyes, nose and corners of mouth;

[0023] S3, according to the positioning information of the face, eyes, nose and corners of the mouth acquired in the step S2, select the pulse original signal periodicity is strong, the region of interest ROI of the face video image with less noise;

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Abstract

The invention relates to a method for improving human face video heart rate detection by using an illumination equalization method. The method comprises the following steps: S1, acquiring a human facevideo image by using a visible light camera; S2, completing face detection and positioning by using a multi-task convolutional neural network; S3, selecting a region of interest of the face video; S4, extracting a scene illumination component by using a fast guided filtering algorithm, constructing an improved two-dimensional gamma function, and balancing the illumination component of the face video image; S5, separating an independent source signal from the mixed signal by using a FastICA algorithm; and S6, performing fast Fourier transform by using the independent source signal, and calculating a heart rate value. According to the method, the illumination component is extracted through the fast guided filtering algorithm, the brightness of the too bright and too dark areas of the face image is improved through the improved two-dimensional gamma function self-adaptive correction illumination non-uniformity light equalization method, the average error and standard deviation of heart rate measurement values are reduced, and the measurement precision is improved.

Description

technical field [0001] The invention relates to the technical fields of image processing and non-contact heart rate detection, in particular to a method for improving human face video heart rate detection by using an illumination equalization method. Background technique [0002] With the improvement of modern living standards, people will pay more attention to their physical health, and heart rate is one of the most important vital signs of the human body, and the detection of heart rate will also receive more attention. In recent years, the heart rate detection equipment on the market has developed rapidly. Small size and convenient measurement are the inevitable trend of development. However, they all require direct physical contact with the measurer. The measurement process of the contact sensor recording method is cumbersome and may cause The discomfort of the patient, especially for the crowd of newborn infants and the like has inapplicability. Therefore, the non-cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/32G06K9/46
CPCG06V40/165G06V40/10G06V40/15G06V10/25G06V10/56
Inventor 谢巍吴少文魏金湖周延陈定权许练濠卢永辉
Owner SOUTH CHINA UNIV OF TECH
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