1. A device for recognizing characters in an image, comprising: an input part for receiving the image; a blurring decision part for classifying the received image into character blocks and background blocks, calculating an average energy ratio of the character blocks, and comparing the average energy ratio with a predetermined threshold to determine whether the received image is blurred; an image binarization part for classifying the received image into character blocks and background blocks if the received image is not blurred, comparing pixels in the character blocks with a pixel threshold, binarizing the pixels in the character blocks into a brightness value for a character pixel and a brightness value for a background pixel based on the comparison, and binarizing pixels in the background blocks into the brightness value for a background pixel; and a character recognition part for recognizing characters in the binarized image.