Adaptive super-sampling based on gaze
In one embodiment, a method includes determining a gaze direction of a user wearing a head-mounted device, the head-mounted device having a display configured to output an image having multiple of pixels. The method may further include determining, for each of the multiple pixels, a set of sampling locations based on the gaze direction of the user, the sets of sampling locations of the multiple pixels being a portion of a sampling pattern defined based on the gaze direction of the user. In one embodiment, the method may also include computing, for each of the multiple pixels, a color value for the pixel by sampling a scene according to the set of sampling locations associated with the pixel, generating the image using the color values of the multiple pixels, and outputting the image using the display of the head-mounted device.
1. A method comprising, by a computing system:
determining a gaze direction of a user wearing a head-mounted device, the head-mounted device having a display configured to output an image having a plurality of pixels;
determining a gaze location on the display based on the gaze direction of the user;
determining, for a respective pixel of the plurality of pixels, a set of sampling locations based on the gaze location, the set of sampling locations being a portion of a sampling pattern, wherein the sampling pattern is defined relative to the gaze location and is predefined and generated by a combination of a spiral pattern and noise configured to reduce aliasing artifacts;
computing, for the respective pixel of the plurality of pixels, a color value for the respective pixel by sampling a scene according to the set of sampling locations associated with the pixel;
generating the image using the color value for the respective pixel of the plurality of pixels; and
outputting the image using the display of the head-mounted device.
2. The method of claim 1 , wherein the sampling pattern is fixed relative to the gaze location.
3. The method of claim 1 , wherein the set of sampling locations associated with the respective pixel of the plurality of pixels is procedurally generated based on a location of the pixel and the gaze location.
4. The method of claim 1 , wherein the sampling pattern is an Interleaved Gradient Noise pattern.
5. The method of claim 1 , wherein the sampling pattern is a blue noise pattern or a dithering pattern.
6. The method of claim 1 , wherein the gaze direction of the user is determined based on eye-tracking data captured by one or more sensors of the head-mounted device.
7. The method of claim 1 , wherein determining the gaze location comprises:
determining a gaze angle between the gaze direction and an optical axis of an eye of the user;
determining a distance between the eye and the display along the optical axis of the eye; and
calculating, based on the gaze angle and the distance, an offset between (1) a location on the display intersected by the optical axis of the eye and (2) the gaze location.
8. The method of claim 1 , wherein the set of sampling locations associated with the respective pixel of the plurality of pixels is used for reducing aliasing artifacts in the image.
9. One or more computer-readable non-transitory storage media embodying software that is operable when executed to:
determine a gaze direction of a user wearing a head-mounted device, the head-mounted device having a display configured to output an image having a plurality of pixels;
determine a gaze location on the display based on the gaze direction of the user;
determine, for a respective pixel of the plurality of pixels, a set of sampling locations based on the gaze location, the set of sampling locations being a portion of a sampling pattern, wherein the sampling pattern is defined relative to the gaze location and is predefined and generated by a combination of a spiral pattern and noise configured to reduce aliasing artifacts;
compute, for the respective pixel of the plurality of pixels, a color value for the respective pixel by sampling a scene according to the set of sampling locations associated with the pixel;
generate the image using the color value for the respective pixel of the plurality of pixels; and
output the image using the display of the head-mounted device.
10. The media of claim 9 , wherein the set of sampling locations associated with the respective pixel of the plurality of pixels is procedurally generated based on a location of the pixel and the gaze location.
11. The media of claim 9 , wherein the gaze direction of the user is determined based on eye-tracking data captured by one or more sensors of the head-mounted device.
12. The media of claim 9 , wherein determine the gaze location comprises:
determine a gaze angle between the gaze direction and an optical axis of an eye of the user;
determine a distance between the eye and the display along the optical axis of the eye; and
calculate, based on the gaze angle and the distance, an offset between (1) a location on the display intersected by the optical axis of the eye and (2) the gaze location.
13. A system comprising:
one or more processors; and
one or more computer-readable non-transitory storage media coupled to one or more of the processors and comprising instructions operable when executed by one or more of the processors to cause the system to:
determine a gaze direction of a user wearing a head-mounted device, the head-mounted device having a display configured to output an image having a plurality of pixels;
determine a gaze location on the display based on the gaze direction of the user;
determine, for a respective pixel of the plurality of pixels, a set of sampling locations based on the gaze location, the set of sampling locations being a portion of a sampling pattern, wherein the sampling pattern is defined relative to the gaze location and is predefined and generated by a combination of a spiral pattern and noise configured to reduce aliasing artifacts;
compute, for the respective pixel of the plurality of pixels, a color value for the respective pixel by sampling a scene according to the set of sampling locations associated with the pixel;
generate the image using the color value for the respective pixel of the plurality of pixels; and
output the image using the display of the head-mounted device.
14. The system of claim 13 , wherein the set of sampling locations associated with the respective pixel of the plurality of pixels is procedurally generated based on a location of the pixel and the gaze location.
15. The system of claim 13 , wherein the gaze direction of the user is determined based on eye-tracking data captured by one or more sensors of the head-mounted device.
16. The system of claim 13 , wherein determine the gaze location comprises:
determine a gaze angle between the gaze direction and an optical axis of an eye of the user;
determine a distance between the eye and the display along the optical axis of the eye; and
calculate, based on the gaze angle and the distance, an offset between (1) a location on the display intersected by the optical axis of the eye and (2) the gaze location.