Abstract: The invention relates to an identification method carried out as follows. A surface structure and an inner structure of a body member are measured (ST1-ST4, ST7) so as to obtain a surface-structure measurement result (FPM) and an inner-structure measurement result (BVPM), respectively. The surface-structure measurement result (FPM) is compared (ST5) with a surface-structure reference result (FPR) that distinguishes an individual from other individuals. The inner-structure measurement result (BVPM) is compared (ST8) with an inner-structure reference result (BVPR) that is associated with the same individual and that distinguishes the individual from other individuals. The body member may be, for example, a finger. In that case, the surface structure comprises a fingerprint and the inner structure comprises a blood-vessel pattern.

Abstract: A method is proposed for investigation of or ascertaining pulse or heartbeat. The method first comprises directing illuminating radiation to illuminate a body part such as a finger. The illuminating radiation is of a wavelength or wavelength band substantially in the blue light region of the light spectrum. Then, an optical speckle pattern of the illuminated body part resulting from the illumination of the body part is obtained and imaged. The optical speckle pattern is representative of the heartbeat and by correlation of frames extracted from the speckle pattern, the pulse or beat extent of the body part may be ascertained.

Abstract: This invention relates to the use 100 of a challenge-response pair 104, 108 for calibrating a device 101 for authenticating 200 a physical token (102) 102.

Abstract: A method for controlling writing on a data carrier device, at least including: writing data on the data carrier device with a data writer device; obtaining a tracking error signal corresponding to a position of the data writer device with respect to a track on the data carrier device; if the tracking error signal is below a predetermined tracking error value: bringing the data writer device to a non-writing state; and if the writer device is in the non-writing state and the tracking error signal is above predetermined tracking error value: bringing the data writer device to a writing state in which the data writer device writes data to the data carrier device.

Abstract: The invention relates to an information carrier (101) intended to be put into a rotary motion, said information carrier (101) comprising: display means (102) designed to display image data, said display means (102) being spatially located by a spatial position, processing means (103) for periodically sending to said display means (102) image data having the same spatial position as said display means (102). Use: Optical disc/Optical disc player.

Abstract: A method for controlling writing on a data carrier device, at least including: writing data on said data carrier device with a data writer device; obtaining a tracking error signal corresponding to a position of said data writer device with respect to a track on said data carrier device; if said tracking error signal is below a predetermined tracking error value: bringing said data writer device to a non-writing state; and if said writer device is in said non-writing state and said tracking error signal is above said predetermined tracking error value: bringing said data writer device to a writing state in which said data writer device writes data to said data carrier device.