Restoration Method of Distorted Digital Document Image Based on Text Line Detection

More and more documents are scanned into digital image, meanwhile, the document scanned into digital image will appear the phenomenon of widespread distortions and shadows. Distortions in a variety of document images have an impact on people's reading comprehension or automated document image processing. In order to solve the problem, this paper uses image segmentation technology to detect text lines for getting lower baseline and upper baseline of the text. With the lower baseline and upper baseline we can adjust the distortion of the document image. So that the corrected image can be obtained. In the image pre-processing, sharpening is a pivotal step.