Spherical coordinates calibration method for linking spherical coordinates to texture coordinates

A calibration method for linking spherical coordinates to texture coordinates, comprising:

• installing a plurality of lamps forming a horizontal semicircle arc and a rotation equipment located at its circle center;
• mounting a first N-lens camera on the rotation equipment, wherein N>1;
• causing the first N-lens camera to spin about a spin axis passing through two ends of the horizontal semicircle arc and capture a plurality of first lens images for different first spin angles by the rotation equipment;
• and
• determining longitude and latitude coordinates of a plurality of first calibration points according to the different first spin angles and the texture coordinates of the first calibration points in the first lens images to create a link between the spherical coordinates and the texture coordinates;
• wherein the first calibration points in each first lens image are associated with the lamps shown in each first lens image;
• wherein heights of the first N-lens camera and the lamps are the same;
• and
• wherein different positions of the lamps respectively represent different latitudes and different first spin angles respectively represent different longitudes.