Sensors and systems for the capture of scenes and events in space and time
Various embodiments comprise apparatuses and methods including a light sensor. The light sensor includes a first electrode, a second electrode, a third electrode, and a light-absorbing semiconductor in electrical communication with each of the first electrode, the second electrode, and the third electrode. A light-obscuring material to substantially attenuate an incidence of light onto a portion of the light-absorbing semiconductor is disposed between the second electrode and the third electrode. An electrical bias is to be applied between the second electrode, and the first and the third electrodes and a current flowing through the second electrode is related to the light incident on the light sensor. Additional methods and apparatuses are described.
1. A method of gesture recognition, the method comprising:
acquiring a stream, in time, of at least two images from each of at least one camera module;
acquiring a stream, in time, of at least two signals from each of at least one light sensor; and
conveying the at least two images and the at least two signals to a processor, the processor being configured to generate an estimate of a gesture's meaning, and timing, based on a combination of the at least two images and the at least two signals, the generation of the estimate of the gesture's meaning and timing including estimating both a direction of an object and a velocity of the object.
2. The method of claim 1 , wherein the at least one light sensor includes a light-absorbing material having an absorbance, across the visible wavelength region of about 450 nm to about 650 nm, of less than about 30%.
3. The method of claim 2 , wherein the light-absorbing material of the at least one light sensor is selected to include a material having PBDTT-DPP, the near-infrared light-sensitive polymer poly(2,60-4,8-bis(5-ethylhexylthienyl)benzo-[1,2-b;3,4-b]dithiophene-alt-5-dibutylloctyl-3,6-bis(5-bromothiophen-2-yl)pyrrol o[3,4-c]pyrrole-1,4-dione).
4. The method of claim 1 , wherein the at least one light sensor includes a light-sensing material capable of sensing infrared light.
5. The method of claim 1 , further comprising modulating a light source using at least one code selected from spatial codes and temporal codes.
6. The method of claim 5 , wherein the light source is selected that has an emission wavelength in the range of about 900 nm to about 1000 nm.