Method of an image preprocessing for recognizing scene-text

PURPOSE: A character cognition unit is provided to recognize character to minimize the error of the character recognition due to the color difference between the character of image and the background recording or the color variation. CONSTITUTION: The image recording is transformed to the gray scale. The brightness of the background region and the character included in image is compared(410). In case the brightness of the character area lows than the brightness of the background region, the brightness of character and brightness of the background make a reverse turn(420). Character and background of 'the life is inversion or the image which does not make a reverse turn are binary. The binary character as described above it is outputted compared to the acknowledged character as described above is the electronic dictionary it is acknowledged.