Abstract:
Apparatus, including a set of N electrodes (22), configured to be located in proximity to an epidermis (24) of a subject, and to acquire signals generated by electric sources within the subject. The apparatus also includes a set of M channels, configured to transfer the signals, where M is less than N, and a switch (40), configured to select, repetitively and randomly, M signals from the N electrodes and to direct the M signals to the M channels. The apparatus further includes a processor (28), configured to activate the switch, and to receive and analyze the M signals from the M channels so as to determine respective positions of the electric sources within the subject.
Abstract:
A diagnostic method includes applying a vibration at a selected frequency to a location within a brain of a living subject (32). Electrical signals resulting from the vibration are measured at multiple positions on a scalp of the subject. The measured electrical signals are processed in order to compute an electrical gain matrix between the location within the brain and the positions on the scalp. Electroencephalogram (EEG) signals are measured at the multiple positions on the scalp. The EEG signals are filtered using the gain matrix in order to identify brain electrical activity originating from the location.
Abstract:
A method of processing an image is disclosed. The method comprises decomposing the image into a plurality of channels, each being characterized by a different depth-of-field, and accessing a computer readable medium storing an in-focus dictionary defined over a plurality of dictionary atoms, and an out-of-focus dictionary defined over a plurality of sets of dictionary atoms, each set corresponding to a different out-of-focus condition. The method also comprises computing one or more sparse representations of the decomposed image over the dictionaries.