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

Claim 13:
14. The electronic device of claim 9, wherein the step of calculating the SURF descriptor of the image of the Wi-Fi tag further comprises:
selecting the center point of the image of the Wi-Fi tag as a SURF point of the image;
taking a square box around the SURF point;
dividing the square box into 16 sub-regions, wherein each of the sub-region contains 25 pixels;
counting the sum of the pixel values in the horizontal direction, the sum of the absolute values of the pixel values in the horizontal direction, the sum of the pixel values in the vertical direction and the sum of the absolute values of the pixel values in the vertical direction of the 25 pixels through Haar wavelet transformation, to obtain the SURF descriptor.