A method for detecting the fitness for circulation of a value document, includes the steps of: a) carrying out a measurement of the thickness on a tactile structure of the value document, and b) comparing the measured thickness with a previously known target thickness of the tactile structure in order to establish the fitness for circulation.

Provided are a quality control method for banknote identification and a quality control system for banknote identification. The quality control method for banknote identification includes: obtaining a multispectral signal collected by a contact image sensor (CIS); extracting a first eigenvalue of the multispectral signal; obtaining a corresponding second eigenvalue according to the first eigenvalue and a pre-set correction conversion value; and inputting the second eigenvalue into a banknote classifier to obtain a corresponding banknote classification result.

Provided are a quality control method for banknote identification and a quality control system for banknote identification. The quality control method for banknote identification includes: obtaining a multispectral signal collected by a contact image sensor (CIS); extracting a first eigenvalue of the multispectral signal; obtaining a corresponding second eigenvalue according to the first eigenvalue and a pre-set correction conversion value; and inputting the second eigenvalue into a banknote classifier to obtain a corresponding banknote classification result.

A banknote image processing device of the present disclosure includes a storage unit and a processor, the storage unit stores an image of a normal banknote therein, and the processor performs pseudo-damage processing that imitates damage caused on the normal banknote, on the image.

A dynamic photometric stereo inspection technique usable to capture and analyse the topography of a moving surface. The technique includes an enhanced data capture method and apparatus comprising a spaced array of at least two coplanar illuminates to improve measurement range and accuracy. The apparatus can be used to inspect banknotes, e.g. to assist with fitness assessment and/or forgery detection. The method may comprise automatically assessing surface topography data to provide qualitative and quantitative information about 2D and 3D features, such as changes in reflectivity, colour, glossiness, 3D texture and the surface profile of the surface under inspection.

A method and apparatus for cleaning a stack of secure instruments such as banknotes is disclosed. Each secure instrument or banknote includes a substrate, visual data and a security feature. The apparatus includes a chamber configured to contain a supercritical fluid at a temperature and a pressure and for a duration sufficient to disinfect or decontaminate the banknotes and not compromise the security feature and the visual data of the banknotes, a structure for holding the stack of banknotes in the chamber so that the supercritical fluid circulates through and around the banknotes to remove one or more substances into the supercritical fluid, and a strapping machine configured to secure a securing mechanism to the stack of banknotes.

A method and apparatus for cleaning a stack of secure instruments such as banknotes is disclosed. Each secure instrument or banknote includes a substrate, visual data and a security feature. The apparatus includes a chamber configured to contain a supercritical fluid at a temperature and a pressure and for a duration sufficient to disinfect or decontaminate the banknotes and not compromise the security feature and the visual data of the banknotes, a structure for holding the stack of banknotes in the chamber so that the supercritical fluid circulates through and around the banknotes to remove one or more substances into the supercritical fluid, and a strapping machine configured to secure a securing mechanism to the stack of banknotes.

A device and a system for detecting a tape or a piece of glue on a document and methods for detecting a tape or a piece of glue on a document are described. The device comprises at least one light source, at least one light receiver and at least one light barrier. The at least one light source is arranged on a first side of the at least one light barrier and the at least one light receiver is arranged on a second side of the at least one light barrier opposite to the first side. The light barrier is configured to come into contact with a document to prevent or reduce light emitted from the light source on the first side of the light barrier to be transmitted to the light receiver on the second side of the light barrier.

A method and system for cleaning a secure instrument, such as a banknote, including a substrate, visual data and a security feature, including exposing the secure instrument to a supercritical fluid at a temperature and a pressure and for a duration sufficient to clean the substrate and not compromise the security feature and the visual data, wherein to clean the substrate includes to remove one or more substances from the substrate into the supercritical fluid. The substances removed from the substrate may include contaminants, dirt, sebum and pathogens.

A method is described for checking a value document, wherein measuring values of the value document are detected in spatially resolved fashion. The measuring value detected in the respective measuring point is allocated to a node corresponding to this measuring point, and a two-dimensional network of nodes is formed therefrom. A network is formed from the two-dimensional network of the nodes and a source node and a sink node. By means of the maximally possible flow through the network, the value document is classified as suspected of forgery or not suspected of forgery. The maximally possible flow through the network is a measure for the degree of probability of the value document having a continuous object along a direction transverse to the direction of the network, said object indicating a manipulation of the value document, such as e.g. an adhesive strip or a separating line of a composed forgery.