Document comparison and analysis for improved OCR

A method for enhancing the accuracy of Optical Character Recognition (OCR) algorithms by detection of differences between a digital image of a document and a text file corresponding to the digital image, created by the OCR algorithm.The method includes calculating the transformation between the first and second digital images such as geometrical distortion, local brightness and contrast differences and blurring due to the optical imaging process. The method estimates the parameters of these transformations so that the transformations can be applied to at least one of the images, rendering it as similar as possible to the other image. The method further compares the two images in order to find differences. The method further displays the differences on a display device and analyzes the differences. The analysis results are fed back to the OCR algorithm.