the invention of the cubic convolution interpolation coefficients for the cubic convolution interpolation method to generate a video signal to a plurality of sub- first dividing into blocks, a second step of the forward scales a cubic convolution interpolation function using a series of interpolation coefficients from the initial samples of the original image data for each sub-block using a first scaling factor divided in a first step and, the forward scaled cubic convolution interpolation is a continuous function from a continuous scaling function, and the third step of the reverse of the original image data to obtain a sample using a second scaling factor, the sample data of the original image of the second and third step and a fourth step of obtaining an error value by comparing them, the error value and a fifth step of generating a cubic convolution interpolation coefficient is minimum. Accordingly, the present invention can be used to create a cubic convolution interpolation coefficient to minimize information loss in each sub-block.
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