Method and device for eliminating ring effect

A device for eliminating a ring effect, comprising:

• one or more processors;
• and
• one or more computer storage media for storing one or more computer-readable instructions, wherein the processor is configured to drive the computer storage media to execute the following tasks:
• capturing, by a camera, a standard ring image generated by light illuminating a standard Fresnel lens;
• establishing a compensation lookup table according to the standard ring image and obtaining a standard ring center point;
• capturing, by the camera, a ring image generated by the light illuminating a Fresnel lens to be tested;
• obtaining a ring center point according to the ring image;
• obtaining a conversion relationship between the ring center point and the standard ring center point;
• and
• performing a compensation procedure on the ring image according to the compensation lookup table and the conversion relationship to eliminate the ring effect in the ring image.