A SUPERRESOLUTION METHOD BASED ON THE DISCRETE COSINE TRANSFORM

In this paper, a super-resolution method based on the Discrete Cosine Transform (DCT) is proposed for a signal with some frequency damage. I f the damage process can be modeled as linear convolution with a type 1 linear phase FIR filter, it is shown that some DCT coefficients of t he damaged signal are the same as those of the original signal except for the DCT coefficients corresponding to the frequency damage. From t his investigation, the proposed method is provided for the DCTs with f our types as expanding the super-resolution method based on the Discre te Fourier Transform (DFT). In addition, two magnification approaches based on the proposed method are described to improve the conventional approach.