Patent ID: 7746503

Claim:
A method of enhancing an image in an image processing device, the method comprising: determining whether a window brightness of a predetermined edge detection region defined by a window in an output screen of documents that include a text region and an image region exceeds a predetermined threshold THa when the difference between brightness values of pixels located in the window exceed the predetermined threshold Tha; determining if the brightness values of each pixel included in the window exceed a predetermined threshold THb when the window brightness exceeds the predetermined threshold THa; calculating binarization data values based on the pixel brightness values of a plurality of windows that are formed by applying different samplings to the predetermined edge detection region; determining a connectivity of the calculated binarization data values with respect to each of the plurality of windows; estimating the pixel to be an edge pixel when the binarization data values have a connectivity; and determining finally the estimated pixel to be an edge pixel when a number of estimated pixels is in excess of a predetermined preset value THd, and if not, determining the estimated pixel not to be an edge pixel.