Dual composite light field device
An apparatus is disclosed for capturing image information. The apparatus includes a waveguide having opposed planar input and output faces. A diffractive optical element (DOE) is formed across the waveguide. The DOE is configured to couple a portion of the light passing through the waveguide into the waveguide. The light coupled into the waveguide is directed via total internal reflection to an exit location on the waveguide. The apparatus further includes a light sensor having an input positioned adjacent the exit location of the waveguide to capture light exiting therefrom and generate output signals corresponding thereto. A processor determines the angle and position of the coupled light with respect to the input face of the waveguide based on the output signals.
1. An apparatus comprising:
a processor;
a first waveguide having opposed planar input and output faces;
a first diffractive optical element (DOE) formed across the first waveguide, the first DOE configured to couple light into the first waveguide, wherein the light coupled into the first waveguide is directed via total internal reflection to an exit location of the first waveguide; and
a light sensor having an input positioned adjacent to the exit location of the first waveguide to capture light exiting therefrom and generate output signals corresponding thereto,
wherein:
the angle and position of the light sensor with respect to the exit location of the first waveguide are movable and are controllable by the processor, and
the output signals comprise a polar coordinate pixel corresponding to the captured light.
2. The apparatus of claim 1 , wherein the light sensor comprises a scanning fiber.
3. The apparatus of claim 1 , wherein the processor is configured to perform a processing operation on the polar coordinate pixel in polar form, the processing operation determining an output in polar form without converting the polar coordinate pixel to a rectangular form.
4. The apparatus of claim 1 , wherein the processor is configured to convert the polar coordinate pixel to a corresponding rectangular coordinate pixel.
5. The apparatus of claim 4 , wherein converting the polar coordinate pixel to a corresponding rectangular coordinate pixel comprises pre-computing a relationship between the rectangular coordinate pixel and an associated polar coordinate pixel projection.
6. A method comprising:
coupling, via a first diffractive optical element (DOE), first light into a first waveguide having opposed planar input and output faces, the first waveguide configured to direct the first light via total internal reflection to an exit location of the first waveguide;
capturing, via a light sensor, the first light from the first waveguide;
generating an output signal corresponding to the first light captured via the light sensor;
wherein:
the first DOE is formed across the first waveguide,
the light sensor has an input positioned adjacent to the exit location of the first waveguide,
the angle and position of the light sensor with respect to the exit location of the first waveguide are movable and controllable by a processor, and
the output signals comprise a polar coordinate pixel corresponding to the first light.
7. The method of claim 6 , wherein the light sensor comprises a scanning fiber.
8. The method of claim 6 , further comprising processing the polar coordinate pixel in polar form and determining an output in polar form without converting the polar coordinate pixel to a rectangular form.
9. The method of claim 6 , further comprising converting the polar coordinate pixel to a corresponding rectangular coordinate pixel.
10. The method of claim 9 , wherein converting the polar coordinate pixel to a corresponding rectangular coordinate pixel comprises pre-computing a relationship between the rectangular coordinate pixel and an associated polar coordinate pixel projection.