Systems, methods, and media for recording an image using an optical diffuser
Systems, methods, and media for recording an image of a scene ate provided. In accordance with some embodiments, systems for recording an image of a scene are provided. comprising. a diffuser {hat diffuses light representing the scene and that has a scattering function that is independent of aperture coordinates, a sensor that receives diffused light representing the scene and generates data representing an image; and a hardware processes that uses a point spread function to deblur the image.
1. A system for recording an image of a scene, comprising:
an image sensor that receives light representing the scene and generates image data representing a first image based on light representing the scene;
a radially symmetric diffuser having a first side that receives light representing the scene and a second side and a one-dimensional thickness profile of the radially symmetric diffuser along a radial direction is random such that each ray of light passing through the radially symmetric diffuser from the first side to the second side forms a section of an annulus on the image sensor having a width w that is the difference between an inner radius and an outer radius of the annulus, such that w is larger than a width of a section of annulus that the ray of light would form in the absence of the radially symmetric diffuser, wherein width w is substantially constant regardless of where along the radial direction the ray of light passes through the radially symmetric diffuser; and
a hardware processor that uses a point spread function corresponding to width w to generate a second image based on the image data representing the first image and that corresponds to a deblurred version of the first image.
2. The system of claim 1 , wherein the diffuser is made by laser etching.
3. The system of claim 1 , wherein the diffuser is of the kinoform type.
4. The system of claim 1 , wherein a scattering function of the diffuser is a symmetric distribution function.
5. The system of claim 4 , wherein the symmetric distribution function of the diffuser is perturbed Gaussian.
6. The system of claim 1 , further comprising a lens that passes the light representing the scene before it is incident on the diffuser.
7. The system of claim 1 , further comprising a lens that is positioned between the diffuser and the sensor.
8. The system of claim 1 , further comprising a display that displays the deblurred image.
9. A method for recording an image of a scene, comprising:
diffusing light representing the scene using a radially symmetric diffuser having a first side that receives light representing the scene and a second side and a one-dimensional thickness profile of the radially symmetric diffuser along a radial direction is random such that each ray of light passing through the radially symmetric diffuser from the first side to the second side forms a section of an annulus on the image sensor having a width w that is the difference between an inner radius and an outer radius of the annulus, such that w is larger than a width of a section of annulus that the ray of light would form in the absence of the radially symmetric diffuser, wherein width w is substantially constant regardless of where along the radial direction the ray of light passes through the radially symmetric diffuser; and
receiving light representing the scene using an image sensor;
generating image data representing a first image based on the light representing the scene received by the image sensor;
using a point spread function corresponding to width w to generate a second image based on the image data representing the first image that corresponds to a deblurred version of the first image.
10. The method of claim 9 , wherein the diffuser is made by laser etching.
11. The method of claim 9 , wherein the diffuser is of the kinoform type.
12. The method of claim 9 , wherein a scattering function of the diffuser is a symmetric distribution function.
13. The method of claim 12 , wherein the symmetric distribution function of the diffuser is perturbed Gaussian.
14. The method of claim 9 , further comprising positioning a lens so that the light representing the scene passes through the lens before it is incident on the diffuser.
15. The method of claim 9 , further comprising positioning a lens between the diffuser and the sensor.
16. The method of claim 9 , further comprising displaying the deblurred image.