Method for measuring motion postures of lower limbs of automobile collision dummy

A method for measuring motion postures of lower limbs of an automobile collision dummy, comprising:

• continuously collecting lower limb images of the automobile collision dummy during a collision in a real automobile collision test;
• identifying an edge contour in each lower limb image;
• sampling a plurality of points from the edge contours of lateral thighs, lower medial thighs, lateral lower legs, and lower medial legs at an equal interval for first degree polynomial curve fitting, to obtain a lateral thigh expression, a medial thigh expression, a lateral lower leg expression, and a lower medial leg expression respectively;
• obtaining a thigh bone expression according to a positional relationship among a thigh bone and lateral and medial contours, the lateral thigh expression, and the medial thigh expression, and obtaining a lower leg bone expression according to a positional relationship among a lower leg bone and lateral and medial contours, the lateral lower leg expression and the lower medial leg expression, wherein the thigh bone and the lower leg bone are simplified as lines, and expressions for the thigh bone and the lower leg bone are determined according to the positional relationship among the thigh bone, the lower leg bone and the lateral and medial contours, the thigh bone and the lower leg bone of the dummy are located in centers of upper and lower edges, the lateral thigh expression and the medial thigh expression are averaged as the thigh bone expression, and the lateral lower leg expression and the lower medial leg expression are averaged as the lower leg bone expression;
• determining various bone positions, various joint positions, and various bone angles of each lower limb according to the thigh bone expression and the lower leg bone expression;
• and
• associating the various bone positions, the various joint positions, and an included angle between two ends of each joint in the plurality of lower limb images in a chronological order to form a series of two-dimensional human rod-shaped model diagrams which characterize changes in motions of the lower limbs.