摘要:
The present invention concerns a method for authentication of physical objects, by sampling and verifying of a probe image of a copy detection pattern (CDP) representing an object to be authenticated. The method comprises, at a training stage, the steps of acquiring a set of reference templates tnn=1N, acquiring a set of training images xnn=1N, pre-processing of the training images, and, at an authentication stage, acquiring a probe image y (70) of a copy detection pattern (CDP) representing an object to be authenticated, performing pre-processing of the probe image, and producing a decision about authenticity of the physical object. The method further comprises, at said training stage, the steps of producing a set of estimates of reference templates, determining a pattern reliability (60), and, at said authentication stage, producing an estimate of probe reference template t̃ (80), applying the determined pattern reliability (60), by use of a mask m reflecting said pattern reliability (60), for a weighted score computation (120, 121, 122), the step of producing a decision about authenticity being based on at least a score s (125) produced by said weighted score computation (120, 121, 122).
摘要:
La présente invention a pour objet un procédé de protection de documents contre la reproduction non autorisée, la reproduction étant une copie, une impression ou une numérisation. Dans une mémoire (16) de données d'un serveur (11) de gestion, il est associé un document (31 a) électronique correspondant au document papier, aux données (31 c) d'identification de la carte sans contact dudit document papier et à un profil (31 b) de droits, ce profil correspondant aux droits de copie, de numérisation et/ou d'impression accordés à des utilisateurs. Lorsque le serveur reçoit une requête de reproduction, il évalue les données d'identification d'une carte sans contact de l'utilisateur reçues, d'un lecteur RFID, par rapport au profil associé au document. En cas de correspondance, la reproduction est autorisée.
摘要:
An apparatus may be provided for determining a signature from an article in a reading volume of the apparatus. The apparatus can comprise a source operable to generate a coherent beam and a beam directing member operable to direct the coherent beam into the reading volume. The apparatus may also comprise a detector arrangement for collecting signals created by scatter of the coherent beam within the reading volume, wherein different ones of the signals relate to scatter from different parts of the reading volume and a processor operable to determine a signature for an article in the reading volume from the collected signals. Use of such apparatus can be repeated whenever required to test authenticity of the article. The apparatus can utilise a camera to ensure that article alignment within the reading volume is such as to provide for reliable signature generation for comparison purposes.
摘要:
The invention relates to a method for securing documents that comprises the step of printing a distribution of points on said document, said printing inducing due to printing randomness a point-by-point unpredictable variation of at least one geometrical variation of the printed points and, before said printing step, the step of generating said point distribution so that the points of said distribution have at least one variable geometrical characteristic between them, the geometrical amplitude of the variation generated having the same magnitude as said unpredictable variation. In some embodiments, during the generation step and in said point distribution, at least one half of the points of said distribution are not laterally juxtaposed to four other points of said point distribution, and at least one dimension of at least a portion of the points of said point distribution has the same magnitude as the average of the absolute value of said unpredictable variation.
摘要:
An image processing apparatus of the present invention inputs image data representing an image, discriminates whether the image represented by the input image data is a first predetermined image, and discriminates whether the image represented by the input image data is a second predetermined image different from the first predetermined image, the above-mentioned two discrimination performing discriminating operation parallelly.
摘要:
An image reading apparatus includes a first reading element for receiving visible light in reflected light from a color document and reading image data corresponding to the visible light as electric signals, and a second reading element for receiving infrared light in reflected light from the color document and reading image data corresponding to the infrared light as electric signals. The image reading apparatus thus reads the image data not only from the visible light but also from the infrared light. Consequently, the image reading apparatus is capable of reading a special distinguishing pattern of copy-prohibited printed matter printed with special ink, such as infrared absorbing ink, as well as ordinary image data, and thereby preventing counterfeiting of copy-prohibited printed matter.