Amazon Technologies, Inc.

Koninklijke Philips Corporation N.v.

Tianyi Wang

Gerard Guy Medioni

Manoj Aggarwal

Baomin Wang

Umer Shahid

Rui Zhao

Georgios Skolianos

An input device determines presence of an actual user, instead of an artifact, by using multi-wavelength reflectance spectroscopy. Light sources are operated to illuminate an object with different colors of light at different times. A detector determines, at those different times, intensity data indicative of intensity 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, and so forth.

System to determine user presence

The present invention relates to a tooth whitening system (), comprising a light source (), a light detector (), and a processing unit (). The light source is configured such that a wavelength of the light emitted is adjustable over a wavelength range of operation. The detector is configured to detect light emitted from the light source. The processing unit is configured to control the light source to adjust the wavelength of the light emitted by the light source and determine a measure of absorption light detected that was emitted from the light source as the wavelength is adjusted. The processing unit is configured to utilize the determined measure of absorption to operate the light source at a wavelength at a peak in absorption.

Tooth whitening system

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Kenmore, WA, United States of America

Tianyi Wang