The key technology of single CCD image based non-contact measurement is three-dimensional (3D) reconstruction. The 3D surface model is usually obtained directly through shape from shading (SFS) method. But when the resolution of an input image is low, the resolution of the 3D surface model reconstructed by the above way would be poor and can not meet practical demmand. To resolve this problem, an improved 3D reconstruction method is proposed. First, the B-spline interpolation method is used to improve the image resolution, and the parameter mapping method of pixels is applied to avoid the image distortion and high frequency missing; then the SFS method is adopted to reconstruct the amplified image according to the gray gradient of image. The experimental results demonstrate that the proposed method can conserve the detail of an image, and improve the resolution and smoothness of the reconstruction model effectively. It will help improve the precision of non-contact measurement based on single CCD image.