track frame meaning in English

履带架

In tracking section , we still adopt the snake to converge on the object contour by improving the energy functions , in the tracking frame , initial points are acquired by calculating the average inter - frame motion vector of the block , because all snaxels have approximately the same motion vector as the moving object is proposed to be rigid and have no salient deformation
跟踪部分：根据刚体运动的特点(运动区域具有一致性和不发生较大的形变)求出运动目标的平均位移矢量，与在分割部分求出的目标的轮廓点的位置相加，作为下一帧跟踪的初始轮廓点，结合改进的snake能量函数使其更精确地收敛到运动目标轮廓上，达到准确跟踪的效果。