Patent ID: 11971493
Assignee: NANNING FULIAN FUGUI PRECISION INDUSTRIAL CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 2:
3. An indoor positioning method based on image visual features executable by a client, comprising:
when a mobile device moves near one of Wi-Fi tags, collecting signal strength values of Wi-Fi signals of Wi-Fi APs near the Wi-Fi tag;
matching the signal strength values of the Wi-Fi tag with a signal strength list in a map database;
obtaining a first location of a first Wi-Fi tag with the greatest matching degree according to the matching result of the signal strength values;
calculating a SURF descriptor of an image of the Wi-Fi tag;
matching the SURF descriptor with SURF descriptors recorded in the map database;
discovering an image of a Wi-Fi tag with the highest matching degree in the map database according to the matching result of the SURF descriptors and obtaining a second location of a second Wi-Fi tag according to the SURF descriptors recorded in the map database;
calculating a homography matrix based on the image of the Wi-Fi tag with the greatest matching degree;
calculating current coordinates of a third Wi-Fi tag according to the homography matrix to obtain a third location of the third Wi-Fi tag; and
obtaining positioning information of the mobile device according to the first location, the second location and the third location.