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

Claim 5:
6. The holographic projection system of claim 1, 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 a first version of the test image displayed in a first virtual image plane including luminance levels of bright objects in the first version of the test image and luminance levels of selected transparent regions of the first version of the test image;
calculating a first contrast ratio based on the luminance levels of the first version of the test image;
measuring luminance levels of a second version of the test image displayed in a second virtual image plane including luminance levels of bright objects in the second version of the test image and luminance levels of selected transparent regions of the second version of the test image; and
calculating a second contrast ratio based on the luminance levels of the second version of the test image.