Patent ID: RE39237

Claim:
A computer usable medium having embodied thereon a computer program for restoring a binary image block reduced through a down sampling into the block with the size of the original binary image block, the computer program being executable by a machine to perform: (a) preparing a threshold table showing various threshold values corresponding to a context C p (state value) of pixels (reference pixels) of the reduced image, around an interpolated pixel; (b) calculating an interpolation value based on the pixel values of pixels (object pixels) adjacent to and/or around the interpolated pixel; (c) calculating the context C p which is the state value of the reference pixels around the interpolated pixel; (d) obtaining a threshold value corresponding to the calculated context from the threshold table; and (e) comparing the interpolation value with the threshold value of the step (d), and setting the pixel value of the interpolated pixel as “1” if the interpolation value is greater than the threshold value, and setting the pixel value of the interpolated pixel as “0” if the interpolation value is equal to or less than the threshold value.