Abstract:
Methods are provided for detecting video surveillance camera tampering, the camera generating a video signal that includes a sequence of images comprising a plurality of pixels. The methods comprise: acquiring such images and processing them to determine a set of predefined characteristics of the image that include points of interest in the image; selecting the set of predefined characteristics of a pair of images comprising a first and second image; determining, for the predefined characteristics, indicators of similarity for the predefined characteristic between the first and second images, including an indicator of correspondence between points of interest in the first and second images; and providing indicators of similarity to one or more classification engines trained to generate a tamper indicator from such indicators. Systems, computer systems and computer programs are also provided which are suitable for implementing such methods.
Abstract:
La présente invention concerne un procédé et un dispositif pour détecter des copies ou quasi-copies d'images, consistant à recevoir une image initiale, convertir l'image initiale en niveaux de gris, redimensionner l'image grisée en une image réduite ayant une pluralité de lignes et un nombre pair de colonnes, calculer une signature globale de l'image réduite, et déterminer si l'image initiale est une copie ou quasi-copie d'image selon le résultat d'une comparaison entre la signature globale de l'image réduite et des signatures d'images de référence. L'étape de calcul de la signature globale comprend les étapes de calculer une signature de ligne pour chaque ligne de l'image réduite, le calcul étant basé sur une comparaison de valeurs, obtenues par statistique sur des sous- ensembles de pixels symétriques sur chaque ligne, et concaténer les signatures de ligne pour obtenir une signature globale.
Abstract:
Image integrity in an archive can be verified using document characteristics. Embodiments of the invention provide a way to verify the integrity of a stored document image by determining document characteristics, which can also be embedded in the image file. Before allowing access to the image file by an application, the characteristics data from an image analysis can be compared to either or both of, characteristics information otherwise stored, or embedded characteristics data. The embedded data can optionally be encrypted. In example embodiments the data can include a result of an optical character recognition of contents of the document, a length of data describing the image, a percentage of a specified color of pixels in the image, or a checksum. Example embedding techniques can include those making use of a tagged image file format (TIFF) header, a steganographic watermark, or an image artifact.
Abstract:
A digital data false alteration detection program causes a computer to execute (a) a step (S1) of dividing digital data into a plurality of smaller block data, (b) a step (S2) of extracting noise inherent to a digital data acquisition device for each of the small block data, (c) a step (S3) of calculating correlation of the noise between adjacent small block data, and (d) a step (S4) of detecting small block data having noise correlation lower than a level predetermined for the surrounding small block data, as falsely altered data.
Abstract:
There is provided a method of identifying User-Created Content (UCC) using an image identifier, including combining a still image with the image identifier, requesting registration of UCC corresponding to the still image combined with the image identifier, and combining a UCC identifier, issued in response to the request, with the still image combined with the image identifier, thus generating final UCC.
Abstract:
A method for producing an assured image acquires image data and segments the image data into one or more spatial regions. One or more quality measures is calculated from the image data that is within the one or more spatial regions. Secure assurance data is produced that is representative of the one or more quality measures and the image data. The secure assurance data is associated with the image data to produce the assured image.
Abstract:
A method for producing an assured image acquires image data and segments the image data into one or more spatial regions. One or more quality measures is calculated from the image data that is within the one or more spatial regions. Secure assurance data is produced that is representative of the one or more quality measures and the image data. The secure assurance data is associated with the image data to produce the assured image.