Light field data acquisition
A light field data acquisition device includes optics and a light field sensor to acquire light field image data of a scene. In at least one embodiment, the light field sensor is located at a substantially fixed, predetermined distance relative to the focal point of the optics. In response to user input, the light field acquires the light field image data of the scene, and a storage device stores the acquired data. Such acquired data can subsequently be used to generate a plurality of images of the scene using different virtual focus depths.
1. A light field imaging device for acquiring light field image data of a scene, the device comprising:
optics, wherein the optics includes an optical path and a focal point, wherein the focal point is associated with a focal length of the optics;
a light field sensor, located (i) in the optical path of the optics to acquire light field image data and (ii) at a substantially fixed, predetermined distance relative to the focal point of the optics, wherein the predetermined distance is substantially independent of the scene, and wherein an optical depth of field of the optics with respect to the light field sensor extends to a depth that is closer than optical infinity; and
a user interface configured to receive a user input, wherein, in response to the user input, the light field sensor acquires the light field image data of the scene;
a storage device, coupled to the light field sensor, configured to store the acquired light field image data of the scene; and
processing circuitry, coupled to the storage device, configured to compute output images having an array of output pixels from the stored light field image data of the scene;
wherein the light field sensor comprises (i) a microlens array having a plurality of microlenses and (ii) a sensor having an array of sensor pixels, and wherein the predetermined distance is between (0.7*N usable *W MLA *F# optics *m)/(W output ) and (3.0*N usable *W MLA *F# optics *m)/(W output ),
where:
N usable is equal to the number of pixels containing usable directional information across a microlens disk image that is formed, through each microlens, on the sensor, or are located under a microlens,
W MLA is representative of a number of microlenses across a width of the microlens array,
W output is representative of a number of pixels across a width of the array of output pixels,
m is equal to a distance between the centers of two neighboring microlenses in the microlens array, and
F# optics is equal to an F-number of the optics.
2. The light field imaging device of claim 1 , wherein the optics are configurable to include a plurality of different focal lengths having associated focal points.
3. The light field imaging device of claim 1 , wherein the optics comprise a zoom lens system having a plurality of zoom positions.
4. The light field imaging device of claim 3 , further comprising a mechanical system, coupled to the light field sensor, configured to maintain the light field sensor unit at the same fixed, predetermined distance relative to the focal point of the optics for the plurality of the zoom positions.
5. The light field imaging device of claim 3 , wherein the zoom lens system comprises a continuous zoom providing the plurality of zoom positions.
6. The light field imaging device of claim 3 , wherein the light field sensor is configured to maintain the predetermined distance relative to the focal point of the optics for the plurality of the zoom positions of the zoom lens system.
7. The light field imaging device of claim 3 , further comprising a mechanical system, coupled to at least one of the light field sensor and the optics, configured to maintain the light field sensor unit at the predetermined distance relative to the focal point of the optics for the plurality of the zoom positions of the zoom lens system.
8. The light field imaging device of claim 1 , further comprising a mechanical system, coupled to the light field sensor and/or the optics, configured to maintain the light field sensor unit at the predetermined distance relative to the focal point of the optics for a plurality of focuses of the optics.
9. A light field imaging device for acquiring light field image data of a scene, the device comprising:
optics, wherein the optics includes an optical path and a focal point, wherein the focal point is associated with a focal length of the optics;
a light field sensor, located (i) in the optical path of the optics to acquire light field image data and (ii) at a substantially fixed, predetermined distance relative to the focal point of the optics, wherein the predetermined distance is substantially independent of the scene, and wherein an optical depth of field of the optics with respect to the light field sensor extends to a depth that is closer than optical infinity; and
a user interface configured to receive a user input, wherein, in response to the user input, the light field sensor acquires the light field image data of the scene; and
a storage device, coupled to the light field sensor, configured to store the acquired light field image data of the scene;
wherein the light field sensor comprises (i) a microlens array having a plurality of microlenses and (ii) a sensor having an array of pixels, and wherein the predetermined distance is greater than (m*F# optics ),
where:
m is equal to the distance between the centers of two neighboring microlenses in the microlens array, and
F# optics is equal to an F-number of the optics.
10. The light field imaging device of claim 9 , wherein the optics are configurable to include a plurality of different focal lengths having associated focal points.
11. The light field imaging device of claim 9 , wherein the optics comprise a zoom lens system having a plurality of zoom positions.
12. The light field imaging device of claim 11 , further comprising a mechanical system, coupled to the light field sensor, configured to maintain the light field sensor unit at the same fixed, predetermined distance relative to the focal point of the optics for the plurality of the zoom positions.
13. The light field imaging device of claim 11 , wherein the zoom lens system comprises a continuous zoom providing the plurality of zoom positions.
14. The light field imaging device of claim 11 , wherein the light field sensor is configured to maintain the predetermined distance relative to the focal point of the optics for the plurality of the zoom positions of the zoom lens system.
15. The light field imaging device of claim 11 , further comprising a mechanical system, coupled to at least one of the light field sensor and the optics, configured to maintain the light field sensor unit at the predetermined distance relative to the focal point of the optics for the plurality of the zoom positions of the zoom lens system.
16. The light field imaging device of claim 9 , further comprising a mechanical system, coupled to the light field sensor and/or the optics, configured to maintain the light field sensor unit at the predetermined distance relative to the focal point of the optics for a plurality of focuses of the optics.
17. A light field imaging device for acquiring light field image data of a scene, the device comprising:
optics, wherein the optics includes an optical path and a focal point, wherein the focal point is associated with a focal length of the optics;
a light field sensor, located (i) in the optical path of the optics to acquire light field image data and (ii) at a substantially fixed, predetermined distance relative to the focal point of the optics, wherein the predetermined distance is substantially independent of the scene, and wherein an optical depth of field of the optics with respect to the light field sensor extends to a depth that is closer than optical infinity; and
a user interface configured to receive a user input, wherein, in response to the user input, the light field sensor acquires the light field image data of the scene; and
a storage device, coupled to the light field sensor, configured to store the acquired light field image data of the scene;
wherein the light field sensor comprises (i) a microlens array having a plurality of microlenses and (ii) a sensor having an array of pixels, and wherein the predetermined distance is less than (N usable *m*F# optics ),
where:
N usable is equal to the number of pixels containing usable directional information across a microlens disk image that is formed, through each microlens, on the sensor, or are located under a microlens,
m is equal to the distance between the centers of two neighboring microlenses in the microlens array, and
F# optics is equal to an F-number of the optics.
18. The light field imaging device of claim 17 , wherein the optics are configurable to include a plurality of different focal lengths having associated focal points.
19. The light field imaging device of claim 17 , wherein the optics comprise a zoom lens system having a plurality of zoom positions.
20. The light field imaging device of claim 19 , further comprising a mechanical system, coupled to the light field sensor, configured to maintain the light field sensor unit at the same fixed, predetermined distance relative to the focal point of the optics for the plurality of the zoom positions.
21. The light field imaging device of claim 19 , wherein the zoom lens system comprises a continuous zoom providing the plurality of zoom positions.
22. The light field imaging device of claim 19 , wherein the light field sensor is configured to maintain the predetermined distance relative to the focal point of the optics for the plurality of the zoom positions of the zoom lens system.
23. The light field imaging device of claim 19 , further comprising a mechanical system, coupled to at least one of the light field sensor and the optics, configured to maintain the light field sensor unit at the predetermined distance relative to the focal point of the optics for the plurality of the zoom positions of the zoom lens system.
24. The light field imaging device of claim 17 , further comprising a mechanical system, coupled to the light field sensor and/or the optics, configured to maintain the light field sensor unit at the predetermined distance relative to the focal point of the optics for a plurality of focuses of the optics.