Abstract
A conditional image enhancement for the low-quality document image is proposed. In a document recognition by software such as OCR, image resolution is very important factor for recognition rate and an images which are low-resolution can be expected to be improved through the existing enhancement methods which can add high-frequency component. However, if images include such noise regions as bleed-through, blot and slur, they process not only improving character regions but also increasing a noises, and cause false recognition. The proposed method can improve the character regions without noise enhancement by conditional adding high-frequency component. This paper shows the effective using OCR software and by comparing existing enhancement method.
