ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,499,708, issued on Dec. 16, was assigned to Zhongshan Ophthalmic Center, Sun Yat-Sen University (Guangzhou, China) and Tsinghua University (Beijing).

"Method and apparatus for measuring gaze difference based on gaze estimation" was invented by Ruixin Wang (Guangdong, China), Haotian Lin (Guangdong, China), Feng Xu (Beijing), Xinping Yu (Guangdong, China) and Junfeng Lyu (Beijing).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed are a method and apparatus for measuring a gaze difference based on gaze estimation. Video data of a testee gazing at a visual target is obtained, and a face image sequence is obtained from the video data. The face image s...