Non-contact oxyhemoglobin saturation measuring method based on imaging device

A technology of imaging equipment and measurement methods, applied in the directions of diagnostic recording/measurement, medical science, sensors, etc., can solve the problems of uncommon use of infrared detection instruments, affecting the scope of application and accuracy of detection, and achieve the effect of simple and easy operation.

Inactive Publication Date: 2013-09-04
中国人民解放军第一五二中心医院 +1
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Problems solved by technology

Initially, infrared light was used and an external light source was used to illuminate the surface of the detected skin. However, infrared detection instruments are not commonly used in daily life, and the external light source often limits the size of the irradiation and detection area, thus affecting the scope and accuracy of detection.

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  • Non-contact oxyhemoglobin saturation measuring method based on imaging device

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Embodiment Construction

[0021] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0022] The first step is to select filters with two wavelengths (470nm and 520nm) with appropriate bandwidths, so that the imaging device can still achieve the brightness of a clear image through the filters under daily light. And fix the filters on the two imaging lenses respectively.

[0023] The second step is to select a suitable lighting environment, determine the position where both imaging devices can clearly and relatively completely image the face area, and fix the device.

[0024] The third step is to start two imaging devices to simultaneously capture video of the scene containing the face area. During the capture process, the face is allowed to move and deflect slightly within the scope of the imaging scene. Save the collected data as a video file.

[0025] The fourth step is to convert th...

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Abstract

The invention discloses a non-contact oxyhemoglobin saturation measuring method based on an imaging device. The method is mainly applied to measuring non-contact oxyhemoglobin saturation under daily ambient light illumination conditions. According to the method, two optical filters with different wave bands (470nm and 520nm) are utilized for respectively reading video including human face areas according to a grey value, calculating the grey average of the human face areas in each frame and drawing time domain curves of the grey average with frame number as variable quantity. The two obtained wave-section-different time domain curves of the grey average are processed to be pulse contours with a smooth base line through an FFT band-pass smoothing. The averaging process is carried out on the wave-shaped curves to obtain I470DC and I520DC. According to the two oscillograms, the extreme value and the number of extreme values in a detecting area are calculated through differential threshold values, the detected pulse wave crest value is averaged, and I470AC and I520AC are obtained. The value can be obtained by combining the I470DC, the I520DC, the I470AC and the I520AC. Finally, oxyhemoglobin saturation is determined according to the fitted curves.

Description

technical field [0001] The patent of the present invention relates to a real-time blood oxygen saturation measurement method based on imaging equipment, which is mainly used in non-contact blood oxygen saturation measurement under daily ambient lighting conditions. Compared with the current blood oxygen saturation measurement method in clinical and daily use, this method has strong anti-interference ability, common equipment, simple operation, and no contact with the tested personnel at all. It is suitable for burns and is not suitable for contact oximeters. patient. It is more suitable for ordinary people to use for health monitoring in daily life. Background technique [0002] Blood oxygen saturation (Oxygen saturation, SO2) is one of the important physiological parameters. Too low blood oxygen saturation will cause irreversible hypoxic damage in human tissues, so it is monitored during anesthesia and surgery very important. At present, among the blood oxygen saturation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/1455
Inventor 赵京生孔令琴赵跃进董立泉刘明刘小华武红简逸云袁路彬吴铁军魏运亮
Owner 中国人民解放军第一五二中心医院
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