Structured light imaging system

摘要

Structured light imaging method and systems are described. An imaging method generates a stream of light pulses, converts the stream after reflection by a scene to charge, stores charge converted during the light pulses to a first storage element, and stores charge converted between light pulses to a second storage element. A structured light image system includes an illumination source that generates a stream of light pulses and an image sensor. The image sensor includes a photodiode, first and second storage elements, first and second switches, and a controller that synchronizes the image sensor to the illumination source and actuates the first and second switches to couple the first storage element to the photodiode to store charge converted during the light pulses and to couple the second storage element to the photodiode to store charge converted between the light pulses.

主权项

1. A structured light imaging system comprising:
an infrared light source configured to generate a stream of light pulses, wherein each of the light pulses comprises a structured light pulse that projects a known pattern of light onto an object; and an image sensor comprising:
a photodiode that converts the stream after reflection by a scene to charge,a first storage element,a first switch coupled between the photodiode and the first storage element,a second storage element,a second switch coupled between the photodiode and the second storage element,a third and a fourth storage element, anda controller coupled to the first and second switches, the controller configured to synchronize the image sensor to the infrared light source, actuate the first switch to couple the first storage element to the photodiode to store charge converted during one or more of the light pulses, and actuate the second switch to couple the second storage element to the photodiode to store charge converted between one or more of the light pulses, wherein the controller is further configured to subtract the charge stored in the second storage element from the charge stored in the first storage element, subtract the charge stored in the second storage element from the charge stored in the third storage element, and subtract the charge stored in the second storage element from the charge stored in the fourth storage element.