Patent ID: 8094958

Claim:
An apparatus for sharpening a blurred enlarged image, including a digital image output unit for outputting a digital image input through a digital image input unit, the apparatus comprising a digital image processing unit for calculating a primary edge direction of the digital image input through the digital image unit to perform enlarging and edge sharpening on the input digital image, wherein the digital image processing unit comprises: a primary edge direction calculating part comprising a digital filter, and extracting input intensity of an image; a first high frequency band calculating part for selecting one of 0°, 90°, 135°, and 45° as a primary edge direction, and obtaining a differential of the primary edge direction to obtain a high frequency band filtering value corresponding to the primary edge direction; a second high frequency band calculating part for obtaining a general high frequency band filtering value; an adaptive digital filtering part for adaptively mixing the high frequency band filtering value filtered by the first high frequency band calculating part with the general high frequency band filtering value filtered by the second high frequency band calculating part according to deviation of an edge direction to obtain a digital filtering value.