Method for digital image interpolation and sharpness enhancement

   
   

The invention disclosed a method for digital image interpolation and sharpness enhancement, said method includes the following steps: 1) Inputting an image signal Xij to a first interpolation low pass filter FIR 1, said FIR 1 is a cubic interpolation filter having filter coefficient hi(n); 2) inputting an image signal Xij to at least one of second interpolation low pass filters FIR 2, said FIR 2 is an interpolation filter having filter coefficient hi'(n), wherein said FIR 2 has a cut-off frequency lower than that of said FIR 1; 3) making FIR 1 outputted via a band pass filter to obtain an image signal tij; 4) making FIR 2 outputted via a delay buffer to obtain an image signal tij'; 5) inputting said image signal tij and tij' to a subtractor to get a differential signal tij-tij'; and 6) obtaining an output of image signal Yij by means of the following equation: Yij=tij+S.multidot.(tij-tij'), where S is a sharpness level control coefficient.

 
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