Abstract: The invention relates to a data carrier having a see-through portion (24) that allows revealing security features (36) with a different appearance on each of its sides (S1, S2) under special lighting conditions, and a method for making such a data carrier. The see-through portion has an improved security, which is more difficult to reproduce by infringers.

Abstract: A method of superimposing a first image onto a second image, wherein each image is defined by a plurality of pixels is disclosed. The method includes changing target pixels of the second image corresponding in position to pixels of the first image to be superimposed on the second image. Changing target pixels of the second image includes changing the values of some of these target pixels of the second image to respective new values. Each new value is based on the original value of at least one pixel of the second image. A personalization method including such an image superimposing method and a data carrier thereby personalized are also disclosed.

Abstract: The invention relates to an enhanced security feature for identification document. For that, the identification document comprises at least two constitution layers, a first specific coating (15) inside the document, between two constitution layers, said coating being able to be revealed under predetermined lighting conditions. It comprises also an assembly of micro-holes (16) provided through at least one of the layers, in order to make possible the revelation of the first specific coating under said predetermined conditions, said assembly of micro-holes, together with said coating to be revealed through micro-holes, drawing said security pattern.

Abstract: A data carrier is provided having a see-through portion (24) that allows revealing security features (36) with a different appearance on each of its sides (S1, S2) under special lighting conditions, and a method for making such a data carrier. The see-through portion has an improved security, which is more difficult to reproduce by infringers.

Abstract: A method of producing a data carrier with a marking is disclosed. The data carrier includes a laser-markable portion and a beam-modifying portion adjacent the laser-markable portion. The beam-modifying portion has a beam modifying property. The method includes irradiating a laser beam through the beam-modifying portion to allow the beam modifying property thereof to modify at least one beam property to produce a resultant laser beam. This resultant laser beam creates a marking with a visual impression corresponding to the resultant laser beam at the laser-markable portion. The method further includes modifying the beam modifying property of at least a part of the beam-modifying portion through which the laser beam is irradiated for creating the marking so that the exact same resultant beam is difficult to be obtained thereat. A data carrier thereby produced is also disclosed.

Abstract: The invention relates to a method for securing a first image by means of graphical anti-counterfeiting means and to a method for securing an identification document with such graphical anti-counterfeiting means. The invention also relates to a secure identification document that allows detecting either a fraudulent modification of the existing personalization or a fraudulent falsified document. For that, graphical anti-counterfeiting image is inserted into an identification image, each image being defined by a plurality of pixels. The characteristic level (for example grey level) of each pixel i of the graphical anti-counterfeiting image is linked, by a function F, to a matrix ?i of pixels defined in the identification image, said pixels of the matrix ?i surrounding the location i of a pixel of the graphical anti-counterfeiting image, said function F taking into account the characteristic level (for example average grey level) G(?i) and the texture level T(?i) of said matrix ?i.

Abstract: Guilloches (preventing modification) and watermarking (preventing substitution) technologies are combined to protect a medium, such as a card or a passport. The major idea stems from their dual role for medium authentication: the presence of one is needed to check the validity of the other one. By nature, the guilloche network is visible in the image and easily detectable by image processing. This network is therefore used to generate reference points as elements of synchronization to retrieve watermark information originally embedded in the medium that has submitted an RST transformation. These reference points are by nature stronger than any other means involving invisible templates in the spatial or Fourier space.

Abstract: The invention relates to an enhanced security feature for identification document. For that, the identification document comprises at least two constitution layers, a first specific coating (15) inside the document, between two constitution layers, said coating being able to be revealed under predetermined lighting conditions. It comprises also an assembly of micro-holes (16) provided through at least one of the layers, in order to make possible the revelation of the first specific coating under said predetermined conditions, said assembly of micro-holes, together with said coating to be revealed through micro-holes, drawing said security pattern.

Abstract: An identification document including a translucent portion is provided. The translucent portion has a first side and a second side, and includes a first personalized information. The first personalized information includes a second personalized information which is hidden in the first personalized information when viewed from the first side of the translucent portion. A filtering device is attached to or formed in the second side of the translucent portion. The filtering device is configured to reveal the hidden second personalized information. The second personalized information appears superimposed onto the first personalized information when viewed from the second side of the translucent portion, and remains hidden when viewed from the first side of the translucent portion.

Abstract: The invention relates to a method for securing a first image by means of graphical anti-counterfeiting means and to a method for securing an identification document with such graphical anti-counterfeiting means. The invention also relates to a secure identification document that allows detecting either a fraudulent modification of the existing personalization or a fraudulent falsified document. For that, graphical anti-counterfeiting image is inserted into an identification image, each image being defined by a plurality of pixels. The characteristic level (for example grey level) of each pixel i of the graphical anti-counterfeiting image is linked, by a function F, to a matrix ?i of pixels defined in the identification image, said pixels of the matrix ?i surrounding the location i of a pixel of the graphical anti-counterfeiting image, said function F taking into account the characteristic level (for example average grey level) G(?i) and the texture level T(?i) of said matrix ?i.

Abstract: Guilloches (preventing modification) and watermarking (preventing substitution) technologies are combined to protect a medium, such as a card or a passport. The major idea stems from their dual role for medium authentication: the presence of one is needed to check the validity of the other one. By nature, the guilloche network is visible in the image and easily detectable by image processing. This network is therefore used to generate reference points as elements of synchronization to retrieve watermark information originally embedded in the medium that has submitted an RST transformation. These reference points are by nature stronger than any other means involving invisible templates in the spatial or Fourier space.

Abstract: The invention relates to a secure identification document having two main surfaces (S1, S2; S3,S4) and at least one edge, and comprising at least two constitution layers (20,22; 24,26), said identification document allowing preventing any separation of its constitution layers, by delamination for example, said separation being otherwise immediately apparent. The solution of the invention relates to the fact that the at least one edge of the identification document is marked with written data (23; 27) that are etched into said edge by means of a laser beam, said written data overlapping said constitution layers (20,22;24,26; 32,33,34), in order to prevent a fraudulent delamination of said document.

Abstract: A method of superimposing a first image onto a second image, wherein each image is defined by a plurality of pixels is disclosed. The method includes changing target pixels of the second image corresponding in position to pixels of the first image to be superimposed on the second image. Changing target pixels of the second image includes changing the values of some of these target pixels of the second image to respective new values. Each new value is based on the original value of at least one pixel of the second image. A personalization method including such an image superimposing method and a data carrier thereby personalized are also disclosed.

Abstract: A method for producing a data carrier with a see-through portion is disclosed. The method includes applying a layer of separation material (14) to a surface of one of an at least translucent layer and a backing layer, and fixedly attaching the other of the translucent layer and the backing layer to that surface of the layer. The separation material prevents a part of the backing layer abutting it from being completely fixedly attached to the translucent layer. The method further includes removing at least a portion of the backing layer abutting the separation material to uncover a portion of the translucent layer adjacent the portion of the backing layer. The uncovered portion of the translucent layer defines a see-through portion of the data carrier. A data carrier with such a see-through portion is also disclosed.

Abstract: A data carrier is provided having a see-through portion (24) that allows revealing security features (36) with a different appearance on each of its sides (S1, S2) under special lighting conditions, and a method for making such a data carrier. The see-through portion has an improved security, which is more difficult to reproduce by infringers.