Indoor positioning method based on image visual features and electronic device

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;
• obtain 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 and a positioning error value 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.

An electronic device, comprising:

• a wireless signal matching module, configured to match a Wi-Fi signal strength value of a Wi-Fi tag closest to a current location of a mobile device with a signal strength list in a map database to obtain a first location of a first Wi-Fi tag with the greatest matching degree;
• a SURF descriptor matching module, configured to match a SURF descriptor of an image of the Wi-Fi tag closest to the current location of the mobile device with SURF descriptors recorded in the signal strength list in the map database to discover an image of a Wi-Fi tag with the greatest matching degree, thereby obtaining a second location of a second Wi-Fi tag corresponding to the image of the Wi-Fi tag with the greatest matching degree;
• and
• a coordinate matching module, configured to obtain a three location of a three Wi-Fi tag according to a homography matrix corresponding to the image of the Wi-Fi tag with the largest matching degree and an empirical value of a positioning error;
• wherein positioning information of the mobile device is obtained according to the first location, the second location and the third location.