ALEXANDRIA, Va., July 30 -- United States Patent no. 12,375,827, issued on July 29, was assigned to AXIS AB (Lund, Sweden).
"Background light subtraction for infra-red images" was invented by Jenny Karlsson (Lund, Sweden).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method of performing background light subtraction in an infra-red (IR) illuminated image depicting a scene, comprises: providing a rolling shutter image sensor; providing an IR light source configured to be turned on and off; changing an on-off status of the IR light source a plurality of times while capturing an image; capturing two or more image frames each image frame comprising: a first set of lines of pixels comprising image data captured...