Abstract: A method for generating synthetic banknotes requires that a multispectral image be generated from a sample banknote. The multispectral image is processed to create a training image in a two-dimensional space. A generative adversarial network is trained using the training image. Synthetic banknotes are generated by seeding the trained generative adversarial network with random data. The synthetic banknotes may then be used to generate a banknote template for a currency validator.

Abstract: A method for generating synthetic banknotes requires that a multispectral image be generated from a sample banknote. The multispectral image is processed to create a training image in a two-dimensional space. A generative adversarial network is trained using the training image. Synthetic banknotes are generated by seeding the trained generative adversarial network with random data. The synthetic banknotes may then be used to generate a banknote template for a currency validator.

Abstract: An image captured for a currency note is preprocessed to correct pixel intensity values to expected pixel intensity values. The corrected image is passed to a currency validator for determining whether the currency not is genuine or non-genuine.

Abstract: An image captured for a currency note is preprocessed to correct pixel intensity values to expected pixel intensity values. The corrected image is passed to a currency validator for determining whether the currency not is genuine or non-genuine.

Abstract: A method of validating a media item, comprising: for each of a plurality of sensors that sense a media item, determining a respective validation score indicating a likelihood that the sensed media item is valid; and determining if the media item is valid responsive to the plurality of validation scores. Apparatus for validating a media item and a document processing module are also provided.

Abstract: A method of validating a media item, comprising: for each of a plurality of sensors that sense a media item, determining a respective validation score indicating a likelihood that the sensed media item is valid; and determining if the media item is valid responsive to the plurality of validation scores. Apparatus for validating a media item and a document processing module are also provided.

Abstract: For cutting a facing such a countersink or a spot facing a rotary cutter is provided with a body having a central aperture arranged to receive a drill or other guide and at least one cutting insert carried by the body rotates with the drill or guide to cut the facing. The insert has a forward cutting edge which projects radially inwardly to form a step projecting inwards relative to the main body of the insert behind the cutting edge region. The drill has a radially recessed portion, such as the radial relief or the flute of the drill, to accommodate said step of the cutting edge region. Such a cutter can be designed to operate at high metal removal rates and can be used with standard forms of drill and reamer.