On November 1, 2021, Unified Patents added a new PATROLL contest, with a $2,000 cash prize, seeking prior art on at least claim 1 of U.S. Patent 9,398,209. The patent is owned by Xperi Holding Corporation, an NPE. The '209 patent relates to a method of tracking faces in an image stream. The method includes receiving images from an image stream including faces, calculating corresponding integral images, and applying different subsets of face detection rectangles to the integral images to provide sets of candidate regions.

The contest will expire on January 17, 2022. Please visit PATROLL for more information and to submit an entry for this contest.