A super-resolution method based on the discrete cosine transforms

A super-resolution method based on the discrete cosine transform (DCT) is proposed for a signal with some frequency damage under a type 1 linear-phase (LP) FIR filter as a damage model. The proposed method can be carried out with real value operation and is applicable to any DCT in 4 kinds of DCTs. In addtion, two magnification schemes based on the proposed method to improve the conventional scheme are described.