Patent ID: 7945100
Filing Date: 2011-05-17
Classification: G06K,H04N

Abstract:
1. An apparatus for detecting a secure document, comprising: an image input unit for receiving an image of a document; an edge image detecting unit for detecting a corner image of the document; an orientation detecting unit for calculating an orientation of the document using the image including the detected corner; an image detecting unit for detecting a corner image of a predetermined size by using the detected orientation; a similarity checking unit for checking the similarity between the detected corner image and previously stored comparative corner images of secure documents; and a document attribute determining unit for determining whether the document is one of the secure documents according to a result of the similarity checking, wherein the previously stored comparative corner images are rearranged and stored in a number of predetermined orientations, wherein the similarity checking unit comprises: a color value detecting unit for detecting the representative color values of the detected corner image; a color value comparing unit for comparing the detected representative color values of the corner image with the representative color values of the comparative corner images and selecting a comparative corner image that have representative color values similar to the detected representative color values of the corner image; and a pixel value comparing unit for comparing color values of the pixels of the detected corner image with color values of the pixels of the selected comparative image according to a result of the color value comparing.