Method for determining step width in gait based on walking track data

Abstract

The invention discloses a method for determining step width in gait based on walking track data. The method comprises the following steps: extracting three-dimensional position coordinates of two markpoints of a right heel and a left heel of a human body in walking; determining a foot landing moment of the human body in walking; calculating the step width of the human body in walking; determiningthe positive and negative of the walking step width of the human body. According to the method for determining the step width in the gait based on the walking track data, a reasonable simplificationmethod and strict mathematical operation are utilized, and whether a side foot following place falls into a polygon defined by the same side foot following track and the stride of the same side foot following track or not is judged to accurately calculate the step width size and positive and negative. The method is reliable in principle, convenient to calculate, easy to implement and high in precision, and therefore a foundation is laid for further internal and external stability analysis, gait feature extraction, biomechanical calculation and the like. Compared with a traditional method, thetechnology is simpler and more accurate.

Description

technical field [0001] The invention relates to a method for determining the step width in a gait. In particular, it relates to a method for determining step width in gait based on walking trajectory data. Background technique [0002] Gait is a behavioral characteristic of human walking, and normal gait has obvious periodicity. Gait characteristics can be described using spatio-temporal parameters, which mainly include stride length, step length, step width, double support period time and single support period time, etc. [0003] Stride width is usually defined as the vertical distance from the line connecting two consecutive heel points on the same side to the heel point on the opposite side. The step width is divided into left and right, named according to the swing side. Stride widths are either positive or negative, eg a negative left stride width means the right foot is to the left of the left foot stride. [0004] Stride width regulation during walking is an impor...

AI Technical Summary

Problems solved by technology

[0005] The traditional method of calculating the step width in the gait is more complicated when judging the positive and negative. It needs to distinguish the left and right according to the global coordinate system, and judge whether the heel position of the opposite side is on the same side or the opposite side of the stride on the same side

This makes the calculation heavy, and may make mistakes in actual operation, especially when turning

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