Color image sharpening using DST-based matrix low-pass Butterworth filters

In this paper, a color digital image sharpening method is developed by using discrete sine transform (DST) and matrix low-pass Butterworth filters. First, the DST method is used to design matrix Butterworth filters. Then, the un-sharp masking method and the designed matrix low-pass Butterworth filter are employed to develop a color image sharpening algorithm. Finally, Lena digital color image is used to demonstrate the usefulness of the proposed sharpening approach.