ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,449,750, issued on Oct. 21, was assigned to AVISION INC. (Hsinchu, Taiwan).
"Duplex document copying system and method thereof" was invented by Chen-Chang Li (Hsinchu, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed are a duplex document copying system and a method thereof applied to a manual operation for a document. A scanning device is connected to a processing device. The processing device stores one or more block pixel thresholds. After the scanning device obtains first scanning data and second scanning data from scanning the document, the processing device compares pixel difference information between the first scanning data and th...