Abstract: An input device assesses an object in a field of view using multi-wavelength reflectance spectroscopy to determine if the object is an actual user or an artifact. Light sources are operated to illuminate an object. For example, the object may be illuminated with white, violet, and infrared light simultaneously. A spectrometer comprising a plurality of detectors, each with associated wavelength filters determines intensity data indicative of intensity of light of these different colors as reflected from the object. The intensity data is processed to determine whether the object is part of a user or is an artifact. For example, if the object is deemed to be a user, biometric input may be acquired. The biometric input may then be processed to identify the user. The input device may be used at various locations, such as at an entry portal, point of sale, under direct solar illumination, and so forth.

Abstract: An input device includes multiwavelength reflectance spectroscopic (MWRS) hardware having a first field of view (FOV) and one or more cameras with respective FOVs that differ from the first FOV. The one or more cameras are used to obtain image data. When a hand is determined to be at a specified position within the first FOV and in a specified pose, the MWRS hardware is operated to obtain intensity data. The intensity data is processed to determine liveness data indicative of whether an object in the first FOV is an actual user or an artifact. The image data obtained within a specified time interval relative to the acquisition of the liveness data indicative of an actual user may then be processed to identify the user. Additional assessments may be performed to validate the image data, such as confirming continuity between acquisition of the liveness data and the image data obtained.

Abstract: This disclosure describes a user-recognition system configured to target a location of a palm of a user at a wide variety of distances without the need to illuminate and/or capture an entire field of view (FOV) at all times. The user-recognition system comprising a first sensor for capturing an image of the palm, a first mirror disposed with the first sensor, a projector disposed with the first mirror, and a second mirror disposed with the first mirror. The second mirror being displaceable and configured to reflect light, projected from the projector and reflected from the first mirror, in a direction toward the palm, and reflect received light, reflected from the palm to the first mirror and to the first sensor.

Abstract: An input device uses banks of spatially separated light sources to selectively illuminate a field of view to acquire input image data used for biometric identification. In one implementation a plurality of banks of light sources are arranged from a first end to a second end of a device. Each bank may comprise light sources that are arranged on both sides of a device centerline. A camera with a rolling shutter acquires rows of image data beginning at the first end and scanning to the second end. While the camera is operating, banks of lights are progressively activated in coordination with the rolling shutter to illuminate a portion of a field of view and an object within, such as a hand, being imaged. This results in high-contrast input image data that is well illuminated, while reducing overall power requirements. The input image data may then be processed for identification.

Abstract: Systems and methods for particle tracking using spatiotemporal offset light beams. In exemplary embodiments, the optical systems and methods can be used with conventional two-photon microscopy equipment to perform high speed, high precision, and deep tissue three-dimensional single-particle tracking. Exemplary embodiments can be configured for single-molecule studies of biological diffusion and transport processes.

Abstract: Systems and methods for particle tracking using spatiotemporal offset light beams. In exemplary embodiments, the optical systems and methods can be used with conventional two-photon microscopy equipment to perform high speed, high precision, and deep tissue three-dimensional single-particle tracking. Exemplary embodiments can be configured for single-molecule studies of biological diffusion and transport processes.