METHOD AND SYSTEM FOR CORRECTING NONUNIFORMITY OF NEAR-EYE DISPLAY

1 . A method for correcting nonuniformity of a near-eye display (NED), comprising:

obtaining a first plurality of images in response to a first test pattern being displayed by a display of the NED, each of the first plurality of images being obtained at a different location adjacent to an end of an optical path coupled to the display;

extracting a distinguishing frequency component among the first plurality of images, the distinguishing frequency component being at least caused by stray light introduced by the optical path; and

determining a correction scheme for correcting nonuniformity of the NED based on the distinguishing frequency component.

2 . The method according to claim 1 , further comprising:

obtaining a second plurality of images in response to a second test pattern being displayed by the display; and

determining an eyebox of the display based on the second plurality of images;

wherein the first plurality of images is obtained within the eyebox of the display.

3 . The method according to claim 2 , wherein obtaining the first plurality of images in response to the first test pattern being displayed by the display of the NED comprises:

determining a central location of the eyebox and a first plurality of locations, adjacent to the end of the optical path, centering the central location within the eyebox; and

obtaining one of the first plurality of images at each location of the first plurality of locations.

4 . The method according to claim 1 , wherein extracting the distinguishing frequency component among the first plurality of images comprises:

downsampling the first plurality of images to obtain a corresponding first plurality of intermediate images having a target resolution;

transforming the first plurality of intermediate images into a frequency domain to obtain a first plurality of frequency domain data sets; and

extracting the distinguishing frequency component from the first plurality of frequency domain data sets.

5 . The method according to claim 4 , wherein the target resolution is equal to a display resolution of the display.

6 . The method according to claim 4 , wherein the first test pattern comprises a plurality of test patterns with different grayscale values.

7 . The method according to claim 4 , wherein the first plurality of images and the first plurality of intermediate images are represented by grayscale values.

8 . The method according to claim 4 , wherein the first plurality of intermediate images is transformed into the frequency domain by Fast Fourier Transform or wavelet transform.

9 . The method according to claim 1 , wherein determining the correction scheme for correcting nonuniformity of the NED comprises:

determining an objective frequency component of an objective one of the different locations adjacent to the end of the optical path based on the distinguishing frequency component;

obtaining a second plurality of images at an objective location in response to a second plurality of test patterns being displayed by the display;

removing the objective frequency component from the second plurality of images;

fitting a mapping relationship for each of display pixels of the display according to the second plurality of test patterns and the second plurality of images, the mapping relationship of a display pixel mapping an objective display pixel and a corresponding image pixel in each image of the second plurality of images; and

determining the correction scheme for correcting nonuniformity of the NED further based on the mapping relationship of each of the display pixels.

10 . The method according to claim 9 , wherein the display comprises a driver to drive display of an image, the method further comprising:

updating the driver of the display according to the correction scheme.

11 . A system for correcting nonuniformity of a near-eye display (NED), comprising:

a light measuring device (LMD) configured to:

obtain a first plurality of images in response to a first test pattern being displayed by a display of the NED, each of the first plurality of images being obtained at a different location adjacent to an end of an optical path coupled to the display; and

a processor configured to:

extract a distinguishing frequency component among the first plurality of images, the distinguishing frequency component being at least caused by stray light introduced by the optical path; and

determine a correction scheme for correcting nonuniformity of the NED based on the distinguishing frequency component.

12 . The system according to claim 11 , wherein the LMD is further configured to obtain a second plurality of images in response to a second test pattern being displayed by the display, and obtain the first plurality of images within an eyebox of the display; and

the processor is further configured to determine the eyebox of the display based on the second plurality of images.

13 . The system according to claim 12 , wherein the processor is further configured to determine a central location of the eyebox and a first plurality of locations, adjacent to the end of the optical path, centering the central location within the eyebox; and

the LMD is further configured to obtain one of the first plurality of images at each location of the first plurality of locations.

14 . The system according to claim 11 , wherein the processor is further configured to:

downsample the first plurality of images to obtain a corresponding first plurality of intermediate images having a target resolution;

transform the first plurality of intermediate images into a frequency domain to obtain a first plurality of frequency domain data sets; and

extract the distinguishing frequency component from the first plurality of frequency domain data sets.

15 . The system according to claim 14 , wherein the target resolution is equal to a display resolution of the display.

16 . The system according to claim 14 , wherein the first test pattern comprises a plurality of test patterns with different grayscale values.

17 . The system according to claim 14 , wherein the first plurality of images and the first plurality of intermediate images are represented by grayscale values.

18 . The system according to claim 14 , wherein the processor is further configured to transform the first plurality of intermediate images into the frequency domain by Fast Fourier Transform or wavelet transform.

19 . The system according to claim 11 , wherein,

the LMD is further configured to:

obtain, in response to a second plurality of test patterns being displayed by the display, a second plurality of images at an objective one of the different locations adjacent to the end of the optical path; and

the processor is further configured to:

determine an objective frequency component of an objective location based on the distinguishing frequency component;

remove the distinguishing frequency component from the second plurality of images;

fit a mapping relationship for each of display pixels of the display according to the second plurality of test patterns and the second plurality of images, the mapping relationship of a display pixel mapping an objective display pixel and a corresponding image pixel in each image of the second plurality of images; and

determine the correction scheme for correcting nonuniformity of the NED further based on the mapping relationship of each of the display pixels.

20 . A non-transitory computer-readable storage medium storing a set of instructions that are executable by one or more processors of a device to cause the device to perform operations for correcting nonuniformity of a near-eye display (NED), the operations comprising:

obtaining a plurality of images in response to a first test pattern being displayed by a display of the NED, each of the plurality of images being obtained at a different location adjacent to an end of an optical path coupled to the display;

extracting a distinguishing frequency component among the plurality of images, the distinguishing frequency component being at least caused by stray light introduced by the optical path; and

determining a correction scheme for correcting nonuniformity of the NED based on the distinguishing frequency component.