System and method of three-dimensional imaging
Systems and methods for three-dimensional imaging are disclosed. A three-dimensional imaging system may include a light source to emit a light pulse. The divergence of the light pulse may be configurable by the system. For example, the system may also include a receiving lens having a field of view and configured to receive a portion of the light pulse reflected or scattered by a scene. The system may configure the light source so that the divergence of the light pulse matches or approximates the field of view of the receiving lens.
1. A method for three-dimensional imaging, including the provisioning of high dynamic range, the method comprising:
emitting a light pulse with a predetermined divergence sufficient to irradiate a scene;
receiving a portion of the light pulse reflected or scattered by the scene;
modulating, as a function of time, an intensity of the received portion of the light pulse;
recording a first image corresponding to the modulated received portion of the light pulse, and recording a second image corresponding to the modulated received portion of the light pulse, in which the first image and second image were recorded using one or more focal plane arrays (FPAs), each comprising a filter; and
generating a three-dimensional image based at least on the first image and second image, in which the one or more FPAs each comprise one or more of a plurality of pixels, and in which the method further comprises selecting information from one or more of the pixels to construct the first image, the second image, or combinations thereof, in which the information is selected based at least on a stored map of the filter.
2. The method of claim 1 , in which the received portion of the light pulse has a duration, and in which modulating the intensity of the received portion of the light pulse as a function of time occurs only once during the duration.
3. The method of claim 1 , in which generating the three-dimensional image is further based on calculating one or more time of flight (TOF) measurements regarding the light pulse based on the intensity modulation.
4. The method of claim 1 , in which the filter comprises an RGB filter, a CYMK filter, or combinations thereof.
5. The method of claim 1 , in which the filter comprises one or more levels of attenuation of the light pulse.
6. The method of claim 1 , in which the one or more FPAs comprise more than one photosite with different sensitivities of each photosite.
7. The method of claim 1 , in which the filter comprises a green filter having an absolute quantum efficiency centered at about 550 nm, a blue filter having an absolute quantum efficiency centered at about 465 nm, and a red filter having an absolute quantum efficiency centered about 620 nm.
8. The method of claim 1 , in which the filter is configured to increase a dynamic range of the FPAs compared to monochromatic light at the FPAs.