Patent ID: 9628660
Date: 2017-04-18
CPC Classifications: G06K,H04N

Claim:
1. A method of recognizing a document image, the method comprising: extracting, from an input image, a primary feature, including information on feature points, by determining each pixel that is not similar to comparison pixels to be a feature point through a comparison of the pixel to the comparison pixels spaced a predetermined distance apart from the pixel; classifying the input image as a document image or a non-document image by applying preset primary classification criteria, including criteria for a total number of the feature points, to the primary feature; determining, when it is determined that the input image is not a document image as a result of classifying the input image as the document image or the non-document image by applying the preset primary classification criteria, separated morphologies existing in a preset region for the input image to be character prediction areas; obtaining minimal area rectangles comprising the morphologies for the respective character prediction areas; extracting a secondary feature comprising information on slopes of the obtained minimal area rectangles; and classifying the input image as the document image or the non-document image by applying preset secondary classification criteria, including criteria for a difference in the slopes, to the secondary feature.