Spline function is available to the numerical computation on the digital computer for its ease to process. Spline function has been utilized in all of the engineering territories. In the discrete digital processing of the continuous images，there are very large amount of image data. If we use the spline function to interpolate and smooth the data set，we would got advantages in computation time reduction. In this paper，we try to discuss an efficient image data compressing method using sp1ine function for least hardware implementations; and a restoration procedure to smooth out the random noise distorted image with the spline functions.