Tumble detection method for human body based on three-axis acceleration sensor

Abstract

The invention discloses a tumble detection method for a human body based on a three-axis acceleration sensor, which acquires human body three-dimensional acceleration signals through the three-axis acceleration sensor. The method adopts the three-axis acceleration sensor to acquire the acceleration signals of the human body in three directions, adopts two characteristic quantities of SVM and SMA to detect the tumble of the human body. The method comprises the following particular steps: 1) acquiring acceleration data of the human body; 2) performing data preprocessing; 3) calculating SVM value; 4) performing SVM wavelet analysis; 5) detecting SVM detection, if the SVMs of a plurality of consecutively acquired sample points are larger than or equal to the threshold value th1, confirming the tumble of the human body initially, and entering step 6), otherwise, continuing step 5); 6) calculating SMA value, if the SMA is larger than or equal to the threshold value th2, entering step 7), otherwise, determining as suspicious tumble, returning to step 5); 7) if the SMAs of a plurality of consecutively acquired sample points is larger than or equal to the threshold value th2, confirming the occurrence of tumble finally and alarming, otherwise, determining as suspicious tumble, and returning to step 5).

Description

technical field [0001] The invention relates to a human body fall detection method, in particular to a human body fall detection method based on a triaxial acceleration sensor. The invention belongs to the technical field of biomedical signal processing. Background technique [0002] A fall refers to a sudden, involuntary, and unintentional change in body position when the human body cannot respond in time, falling to the ground or a lower surface. Most people have experienced falls to some degree, but for older adults, falls can be far more traumatic than for younger or healthier individuals. [0003] The aging trend of China's social population is becoming more and more serious, and the aging process is gradually accelerating. According to the sixth census in 2010, the population aged 60 and over was 177,648,705 (177 million), accounting for 13.26% of the total population of the country, an increase of 2.93 percentage points from the 2000 census, of which the population ...

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Problems solved by technology

[0010] (3) Intelligent detection system: It is set that the inevitable result after the human body falls is that the detected person does not move for a period of time after the fall. The disadvantage is that the real-time performance is poor and it takes a long time

Obviously, this fall detection method is too simple, and the result is not very ideal. Later, a detection system with acceleration signals as the detection object gradually appeared, such as a single-direction acceleration sensor placed on the torso and front of the thigh, but due to the single The limitation of the direction acceleration sensor, this method can only detect several typical activities and posture changes

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