Motion detection method and device

摘要

A motion detection method and device are introduced. The motion detection method is adapted to detect accelerations of an intended target along the x-axis, y-axis, and y-axis, respectively, and determine whether the intended target is in a fallen state or is undergoing a falling motion according to a signal strength algorithm and an average force field algorithm. The motion detection device includes an acceleration sensing unit for detecting acceleration along the x-axis, y-axis, and y-axis; a computing unit for determining a falling motion according to the acceleration along the x-axis, y-axis, and y-axis; and a transmitting unit for sending a message pertaining to the falling motion.

主权项

1. A motion detection method, comprising the steps of:
detecting accelerations ax, ay, az of an object under test along x-axis, y-axis, and z-axis, respectively, as soon as the object under test undergoes a motion at a first point in time; calculating absolute values |ax|, |ay|, |az| of the accelerations ax, ay, az, respectively, and defining the calculated absolute values |ax|, |ay|, |az| as a1, a2, a3, respectively, in a decreasing order; substituting a1, a2, a3 into an algorithm of a first signal strength and a second signal strength to calculate the first signal strength and the second signal strength; and determining that the object under test has undergone a fall motion when none of the first signal strength and the second signal strength is less than 2.5 g, wherein g denotes gravitational acceleration.