Gait analysis apparatus and method

A gait analysis apparatus for analyzing gait of a subject, the apparatus comprising:

• a processor;
• and
• a memory that is operatively connected to the processor and stores one more instructions executed by the processor,
• wherein when the memory is executed through the processor, the instruction cause the processor to
• collect a two-dimensional gait video of a subject's gait situation during a preset time, which is captured using a camera,
• generate a three-dimensional coordinate system based on at least one frame of the two-dimensional gait video by receiving three-dimensional information of a capturing space,
• calculate three-dimensional feature point coordinates by receiving a plurality of feature points on the three-dimensional coordinate system, and calculate two-dimensional feature point coordinates for the plurality of feature points using resolution information of the camera,
• estimate mapping information between the three-dimensional feature point coordinates and the two-dimensional feature point coordinates by using the three-dimensional feature point coordinates, the two-dimensional feature point coordinates, and an internal index of the camera
• calculate a plurality of two-dimensional joint position information for the subject from the two-dimensional gait video,
• calculate a plurality of three-dimensional joint position information corresponding to the plurality of two-dimensional joint position information using the plurality of two-dimensional joint position information, the internal index of the camera, and the mapping information, and
• calculate gait parameters for the subject using the three-dimensional joint position information.