Abstract: An apparatus has a first ring of infrared emitters and a second ring of infrared detectors positioned adjacent to the first ring. A controller applies signals to the first ring and collects signals from the second ring.

Abstract: An apparatus includes a processor and a memory connected to the processor. The memory stores instructions executed by the processor to perform a transformation on a detected signal that has penetrated an object of interest to form a sinogram. The sinogram is a sine-based representation of the detected signal. A feature of interest is identified in the sinogram. A tomogram corresponding to the detected signal is reconstructed. The instructions to reconstruct utilize the feature of interest to determine at least one attribute of the tomogram.

Abstract: The present invention refers to a touch-sensitive detecting device (1) comprising a sensor (10) associated with a control circuit (50), the sensor (10) comprising a layer (5) with at least an interface (6) suitable for defining a detection area (11) for at least one object (51) in contact with said detection area (11), a number N of emitters (15) and a number M of receivers (20) coupled with said layer (5), said N emitters (15) suitable for emitting a beam (Pn) of detection signals (30) at a wavelength in said layer (5) and said M receivers (20) being suitable for receiving at least a detection signal of said beam (Pn) of detection signals (30) emitted by said emitters (15) and for generating an output signal, said layer (5) being transparent at the wavelength of said detection signals (30) emitted by said N emitters (15) and defining a waveguide for said detection signals (30); the control circuit (50) is suitable for associating a subset of M receivers (20) with each of said N emitters (15), and is suitable