Patent ID: 11948267
Assignee: AIRBUS SAS
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 15:
16. A method performed by an aerospace craft comprising:
acquire a preliminary version of digital image of terrain on which the craft is located;
transform the preliminary version of the digital image to an intermediate version of the digital image by projecting the preliminary version onto a plane corresponding to a plane of digital maps stored in the aerospace craft,
select a first format digital map from the digital maps, wherein the selected first format digital map shows the terrain on which the craft is located;
augment and/or invert a contrast of the intermediate version of the digital image to obtain a final version of the digital image, wherein a contrast of the final version is increased as compared to the contrast of the intermediate version of the digital image,
augment a contrast of the selected first format digital map to obtain a final version of the digital map, wherein the contrast of the final version of the digital map is increased as compared to a contrast of the selected first format of the digital map,
compare the final version of the digital image to the final version of the digital map,
based on the compare, identify a region of the final version of the digital map similar to a region of the terrain on which the craft is located as shown in the final version of the digital image;
identify a location corresponding to the region in the final version of the digital map, and
using the identified location to determine an actual location of the craft.