Apparatuses, systems, and methods for high-sensitivity active illumination imaging
A disclosed imaging device may include an image sensor, a lens system, and an aperture filter. The aperture filter may include a first concentric region that passes light of a first wavelength range and that blocks light of a second wavelength range and a second concentric region that passes light of the first wavelength range and light of the second wavelength range. The lens system may direct received light through the aperture filter toward the image sensor. The lens system and the aperture filter may provide a first depth-of-field associated with the first wavelength range and a second depth-of-field associated with the second wavelength range. Associated systems and methods are also disclosed.
1. An imaging device comprising:
an image sensor;
an aperture filter having a plurality of concentric regions including:
a first concentric region that passes light of a first wavelength range and a second wavelength range, the first concentric region having a first diameter;
a second concentric region encompassed by the first concentric region, the second concentric region at least partially blocking light of the second wavelength range, the second concentric region having a second diameter; and
a third concentric region opaque to light of the first wavelength range and the second wavelength range, the third concentric region having a third diameter; and
a lens system that directs received light through the aperture filter toward the image sensor, wherein:
the third diameter is greater than the first diameter;
the first diameter is greater than the second diameter;
at least a portion of the received light that passes through the second concentric region subsequently passes through the first concentric region when directed towards the image sensor; and
the lens system and the aperture filter provide a first depth-of-field associated with the first wavelength range and a second depth-of-field associated with the second wavelength range.
2. The imaging device of claim 1 , wherein the lens system comprises two sets of lenses and wherein the aperture filter is disposed in between the first set of lenses and the second set of lenses.
3. The imaging device of claim 1 , wherein the third concentric region passes light of a third wavelength range.
4. The imaging device of claim 3 , wherein the third wavelength range comprises a visible wavelength spectrum.
5. The imaging device of claim 1 , wherein the first diameter is greater than the second diameter such that the first diameter results in a lower effective f-number for light in the first wavelength range than the second diameter results in for light in the second wavelength range.
6. The imaging device of claim 1 ,
wherein the first wavelength range comprises a visible wavelength spectrum, and
wherein the second wavelength range is centered around about 850 nanometers.
7. The imaging device of claim 1 , wherein the first concentric region is of a thickness such that material that forms the second concentric region may be embedded within material that forms the first concentric region.
8. The imaging device of claim 1 , wherein material that forms the second concentric region is deposited onto material that forms the first concentric region.
9. The imaging device of claim 1 , wherein the second concentric region comprises a dichroic filter.
10. A system comprising:
a head-mounted display; and
an imaging device that comprises:
an image sensor;
an aperture filter having a plurality of concentric regions including:
a first concentric region that passes light of a first wavelength range and a second wavelength range, the first concentric region having a first diameter;
a second concentric region encompassed by the first concentric region, the second concentric region at least partially blocking light of the second wavelength range, the second concentric region having a second diameter; and
a third concentric region opaque to light of the first wavelength range and the second wavelength range, the third concentric region having a third diameter; and
a lens system that directs received light through the aperture filter toward the image sensor, wherein:
the third diameter is greater than the first diameter;
the first diameter is greater than the second diameter;
at least a portion of the received light that passes through the second concentric region subsequently passes through the first concentric region when directed towards the image sensor; and
the lens system and the aperture filter provide a first depth-of-field associated with the first wavelength range and a second depth-of-field associated with the second wavelength range.
11. The system of claim 10 , wherein the image sensor, the lens system, and the aperture filter are disposed within an imaging device housing that is coupled to at least one of:
the head-mounted display of a virtual reality headset or an augmented reality headset; or
an external sensor device.
12. The system of claim 10 ,
further comprising a hand-held controller that includes at least one light-emitting element that emits light in the first wavelength range; and
wherein the imaging device comprises part of a local area imaging assembly that tracks the hand-held controller based on the light emitted by the at least one light-emitting element of the hand-held controller.
13. The system of claim 10 , further comprising a projector system that, directs light of the second wavelength range into an imaging environment.
14. The system of claim 13 , wherein the projector system directs the light of the second wavelength range into the imaging environment as a two-dimensional pattern of light regions.
15. The system of claim 10 , wherein the third concentric region passes light of a third wavelength range.
16. The system of claim 10 , wherein at least one of the plurality of concentric regions is annular.
17. The system of claim 10 , wherein the second wavelength range has a longer wavelength the first wavelength range.
18. A method comprising:
receiving light at an image sensor and through a lens system and an aperture filter, wherein:
the aperture filter has a plurality of concentric regions including:
a first concentric region that passes light of a first wavelength range and a second wavelength range, the first concentric region having a first diameter;
a second concentric region encompassed by the first concentric region, the second concentric region at least partially blocking light of the second wavelength range to generate electronic signals associated with the first and second wavelength ranges, the second concentric region having a second diameter; and
a third concentric region opaque to light of the first wavelength range and the second wavelength range, the third concentric region having a third diameter; and
the lens system directs received light through the aperture filter toward the image sensor, wherein:
the third diameter is greater than the first diameter;
the first diameter is greater than the second diameter;
at least a portion of the received light that passes through the second concentric region subsequently passes through the first concentric region when directed towards the image sensor; and
the received light is directed such that the lens system and the aperture filter provide a first depth-of-field associated with the first wavelength range and a second depth-of-field associated with the second wavelength range;
processing the electronic signals associated with the first wavelength range according to a first computer-vision scheme; and
processing the electronic signals associated with the second wavelength range according to a second computer-vision scheme.
19. The method of claim 18 , wherein at least one of the first and second wavelength ranges is outside the visible wavelength spectrum.
20. The method of claim 18 , wherein processing the electronic signals associated with the second wavelength range according to the second computer-vision scheme comprises processing the electronic signals associated with the first wavelength range according to the second computer-vision scheme.