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1. WO2020065101 - SYSTEM AND METHOD FOR AUTOMATIC IDENTIFICATION OF PHOTOCOPIED DOCUMENTS

Publication Number WO/2020/065101
Publication Date 02.04.2020
International Application No. PCT/ES2018/070620
International Filing Date 26.09.2018
IPC
G07D 7/00 2016.01
GPHYSICS
07CHECKING-DEVICES
DHANDLING OF COINS OR OF VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
7Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
G07D 7/004 2016.01
GPHYSICS
07CHECKING-DEVICES
DHANDLING OF COINS OR OF VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
7Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
004using digital security elements, e.g. information coded on a magnetic thread or strip
CPC
G07D 7/00
GPHYSICS
07CHECKING-DEVICES
DHANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
7Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
G07D 7/004
GPHYSICS
07CHECKING-DEVICES
DHANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
7Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
004using digital security elements, e.g. information coded on a magnetic thread or strip
Applicants
  • SOTEC CONSULTING S.L. [ES]/[ES]
Inventors
  • MUÑOZ UTIEL, Armando
  • GONZÁLEZ GARCÍA, David
Agents
  • CARVAJAL Y URQUIJO, Isabel
  • GÓMEZ-ACEBO, Isabel
Priority Data
Publication Language Spanish (ES)
Filing Language Spanish (ES)
Designated States
Title
(EN) SYSTEM AND METHOD FOR AUTOMATIC IDENTIFICATION OF PHOTOCOPIED DOCUMENTS
(ES) SISTEMA Y MÉTODO DE IDENTIFICACIÓN AUTOMÁTICA DE DOCUMENTOS FOTOCOPIADOS
(FR) SYSTÈME ET PROCÉDÉ D'IDENTIFICATION AUTOMATIQUE DE DOCUMENTS PHOTOCOPIÉS
Abstract
(EN)
The invention relates to a method comprising: capturing (202) an image (112) of a marked printed document (102); decoding (204) a digital watermark embedded in the image (112), obtaining a mark identifier (206); recovering, by searching (208) a database (306), at least one calibration parameter associated with the mark identifier (206); applying (214) a discrete Fourier transform to the image, obtaining a frequency matrix (216); obtaining (222) at least one maximum frequency value (224) in the frequency matrix (216); comparing (226) the at least one maximum frequency value (224) with at least one calibration parameter; and determining (228), on the basis of the comparison, if the marked printed document (102) is an original document (124) or a photocopied document (126). The method identifies a photocopied document without losing the digital watermark, maintaining the traceability of the document throughout its entire useful life.
(ES)
El método comprende: capturar (202) una imagen (112) de un documento impreso marcado (102); descifrar (204) una marca de agua digital embebida en la imagen (112), obteniendo un identificador de marca (206); recuperar, mediante consulta (208) a una base de datos (306), al menos un parámetro de calibración asociado al identificador de marca (206); aplicar (214) una transformada de Fourier discreta sobre la imagen, obteniendo una matriz de frecuencias (216); obtener (222) al menos un valor máximo de frecuencia (224) en la matriz de frecuencias (216); comparar (226) el al menos un valor máximo de frecuencia (224) con al menos un parámetro de calibración; determinar (228), en base a dicha comparación, si el documento impreso marcado (102) es un documento original (124) o un documento fotocopiado (126). El método identifica un documento fotocopiado sin la pérdida de la marca de agua digital, manteniendo la trazabilidad del documento durante toda su vida útil.
(FR)
Le procédé selon l'invention consiste à: capturer (202) une image (112) d'un document imprimé marqué (102) déchiffrer (204) un filigrane numérique incorporé dans l'image (112), pour obtenir ainsi un identificateur de marque (206); récupérer, au moyen d'une interrogation d'une base de données (306), au moins un paramètre d'étalonnage associé à l'identificateur de marque (206); appliquer une transformation de Fourier discrète à l'image, pour obtenir ainsi une matrice de fréquences (216); obtenir au moins une valeur maximale de fréquence (224) dans la matrice de fréquences (216); comparer (226) la au moins une valeur maximale de fréquence (224) avec au moins un paramètre d'étalonnage; déterminer (228) sur la base de ladite comparaison, si le document imprimé marqué (102) est un document original (124) ou un document photocopié (126). Le procédé identifie un document photocopié sans perdre le filigrane numérique, maintenant ainsi la traçabilité du document pendant toute sa vie utile.
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