For each image sequence, cyclic width of gait analysis is performed to extract key frames, and Fourier descriptor is utilized to describe gait contour.

• 利用运动人体的宽高比的周期性变化来提取关键帧,并采用傅立叶描述子对关键帧步态轮廓进行分析和优化,构建特征矢量;