Abstract: A classification method comprises positioning an object and a radar unit in proximity to each other; receiving by the radar unit radar signals reflected from the object; and classifying the object, wherein the classifying is based on the radar signals and/or at least one feature extracted from the radar signals, and the classifying of the object comprises determining classification data for the object.

Abstract: An example method includes determining, by one or more processors, an estimated location of a wearable computing device on a display device that is not presence-sensitive, wherein the wearable computing device is configured to be worn on a wrist of a user; causing the display device to output, at the estimated location, a graphical pattern; determining, by the one or more processors and based on optical data generated by an optical sensor of the wearable computing device, a refined location of the wearable computing device; and utilizing, by the one or more processors, the refined location of the wearable computing device as a location of user input for an application outputting a graphical user interface via the display device.

Abstract: An example method includes determining, by one or more processors, an estimated location of a wearable computing device on a display device that is not presence-sensitive, wherein the wearable computing device is configured to be worn on a wrist of a user; causing the display device to output, at the estimated location, a graphical pattern; determining, by the one or more processors and based on optical data generated by an optical sensor of the wearable computing device, a refined location of the wearable computing device; and utilizing, by the one or more processors, the refined location of the wearable computing device as a location of user input for an application outputting a graphical user interface via the display device.

Abstract: A method comprises positioning a display screen of a mobile device and a surface of interest such that the display screen of the mobile device faces the surface of interest; emitting light by the display screen, wherein at least part of the emitted light is reflected by the surface of interest; receiving, by a camera of the mobile device, at least part of the light emitted by the display screen and reflected from the surface of interest thereby to generate at least one image; and processing the at least one image to determine at least one property of the surface of interest.

Abstract: A classification method comprises positioning an object and a radar unit in proximity to each other; receiving by the radar unit radar signals reflected from the object; and classifying the object, wherein the classifying is based on the radar signals and/or at least one feature extracted from the radar signals, and the classifying of the object comprises determining classification data for the object.