Patent ID: 6567539
Filing Date: 2003-05-20
Classification: G06K

Abstract:
A method for authenticating an image by comparing it with a reference image, by means of a device (40, 91, 125) and a portable object (8, 94, 126), the device including data processing means (2), data memorizing means (3,4), and image processing means (18, 97, 125), and the portable object including data processing means (9), data memorizing means (10), a through window (32, 33), and display means (17) capable of displaying an image in the window, in which the portable object is arranged to display a mask of predetermined shape in the window (32, 33), and the image processing means of the device including image sampling means (18), comprising:placing the window of the portable object before the image sampling means of the device; causing a mask to be displayed in the window by the display means (17) of the portable object, such that the mask masks a predetermined portion of the window; presenting an image to be authenticated to the image sampling means in such a way that the window is placed between the image and the sampling means; sampling by the image sampling means a datum of the image to be authenticated, linked with a portion of the image to be authenticated as said portion appears through the window, and causing said datum of the image to be authenticated to be transmitted to the portable object; and comparing said datum of the image to be authenticated by the processing means (9) of the portable object with a datum of the reference image, linked with a portion of the reference image obtained by using the same mask and stored in the memorizing means (10) of the portable object.