This paper develops a new kind of method to measure the shape feature and displacement of barycenter. A CCD camera is fixed on the air-bearing module to collect visual signal. Through calculation each frame's characteristic area by using B-spline wavelet transform to obtain edge and eigenvalue by technology of orientation and construct a kind of B-spline wavelet, the capability of identification of character is improved and the position of barycenter of each region is detected. In the paper, constructing compact support scale functions with linear phase, and corresponding compact support biorthgonal wavelets by means of B-spline.