So the polynomial interpolation applied to light spot image is presented,which can improve the detecting precision of spot by reducing the discreteness of image and noise.

• 文章提出用多项式插值对光斑图进行插值处理来降低图像灰度的离散度；可以平滑光斑图噪声；提高光斑阵列的探测精度；从而提高波前探测精度.