ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,511,449, issued on Dec. 30, was assigned to Shanghai Jiao Tong University (Shanghai).

"Surface topography reconstruction method and system integrating machine learning and spatial frequency analysis" was invented by Zhinan Zhang (Shanghai), Nian Yin (Shanghai) and Zishuai Wu (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "A surface topography reconstruction method integrating machine learning and spatial frequency analysis includes step 1: Using the analytical formula of the spatial frequency method to generate a large number of two-dimensional arrays that symbolize rough surfaces; step 2: by analyzing the height distribution and the frequency ...