Virtual window

1. A virtual window system, the system comprising a light field camera device and a light field display device arranged back-to-back, the light field camera device configured to sample a continuous input light field at an input light field boundary to produce a discrete input light field video stream, the light field display device configured to reconstruct a continuous output light field at an output light field boundary from a discrete output light field video stream, wherein the system is configured to resample the discrete input light field video stream to translate it from the input light field boundary to the output light field boundary to produce the discrete output light field video stream, as if the discrete output light field video stream had been sampled from the continuous input light field at the output light field boundary.

2. The system of claim 1 , wherein the light field camera device comprises at least one input focus modulator, whereby the focus of at least part of the input light field video stream is modulated according to a fixation depth of a viewer of the light field display device.

3. The system of claim 1 , wherein the light field display device comprises at least one output focus modulator, whereby the focus of at least part of the output light field video stream is modulated according to a fixation depth of a viewer of the light field display device.

4. The system of claim 1 , wherein the light field camera device comprises at least one input focus modulator and the light field display device comprises at least one output focus modulator, whereby the focus of at least part of the input light field video stream and the focus of at least part of the output light field video stream are modulated, respectively, according to a fixation depth of a viewer of the light field display device.

5. The system of claim 1 , wherein the input light field video stream is incorporated into a rendered light field video stream to produce the output light field video stream, the rendered light field video stream comprising at least one virtual 3D object.

6. The system of claim 5 , wherein the rendered light field video stream comprises at least one virtual 3D object which interacts with part of the input light field video stream, the interaction selected from the group comprising: reflection and refraction.

7. The system of claim 1 , wherein the light field camera device comprises an array of light field camera elements, each camera element comprising:

(a) an array of radiance sensors for sensing the radiance of a set of input beams over time, the input beams spanning a two-dimensional angular field; and

(b) an input focus modulator for modulating the focus of the input beams over time.

8. The system of claim 1 , wherein the light field camera device comprises an array of light field camera elements, each camera element comprising:

(a) a scanner for scanning an input beam across a two-dimensional angular field;

(b) an input focus modulator for modulating the focus of the input beam over time; and

(c) a radiance sensor for sensing the radiance of the input beam over time.

9. The system of claim 1 , wherein the light field display device comprises an array of light field display elements, each display element comprising:

(a) an array of beam generators and radiance modulators for generating and modulating the radiance of a set of output beams over time, the output beams spanning a two-dimensional angular field; and

(b) an output focus modulator for modulating the focus of the output beams over time.

10. The system of claim 1 , wherein the light field display device comprises an array of light field display elements, each display element comprising:

(a) a beam generator for generating an output beam of light;

(b) a radiance modulator for modulating the radiance of the output beam over time;

(c) an output focus modulator for modulating the focus of the output beam over time; and

(d) a scanner for scanning the output beam across a two-dimensional angular field.

11. A method of providing a virtual window through a space, the window having an input light field boundary and an output light field boundary, the light field boundaries separated by the space, the method comprising:

(a) sampling, using a light field camera device, a continuous input light field at the input light field boundary to produce a discrete input light field video stream;

(b) resampling the discrete input light field video stream to translate it from the input light field boundary to the output light field boundary to produce a discrete output light field video stream, as if the discrete output light field video stream had been sampled from the continuous input light field at the output light field boundary; and

(c) reconstructing, using a light field display device, a continuous output light field at the output light field boundary from the discrete output light field video stream.