Patent ID: 11947315
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Field: Optics (Instruments)
Classification: CPC G  B | IPC B  G

Claim 17:
18. The method of claim 13, further comprising:
determining a first contrast ratio based on (i) a sum of luminance levels of bright objects displayed in a first version of the test image, (ii) a sum of luminance levels of transparent regions of the first version of the test image (iii) a number of the bright objects displayed in the first version of the test image, and (iv) a number of the transparent regions of the first version of the test image; and
determining a second contrast ratio based on (i) a sum of luminance levels of bright objects displayed in a second version of the test image, (ii) a sum of luminance levels of transparent regions of the second version of the test image, (iii) a number of the bright objects displayed in the second version of the test image, and (iv) a number of the transparent regions of the second version of the test image,
wherein measuring the luminance levels of the plurality of versions of the same test image and calculating the plurality of contrast ratios comprise;
measuring luminance levels of the first version of the test image displayed in a first virtual image plane;
calculating the first contrast ratio based on the luminance levels of the first version of the test image;
measuring luminance levels of the second version of the test image displayed in a second virtual image plane; and
calculating the second contrast ratio based on the luminance levels of the second version of the test image.