Method, apparatus, and system for object recognition, object segmentation and knowledge acquisition
Luis von Ahn, Ruoran Liu, Manuel Blum, Alexei (Alyosha) Efros and Maria Manuela Veloso
U.S. Patent 7,785,180. August 2010

Texture synthesis and transfer for pixel images
William T. Freeman and Alexei (Alyosha) Efros
U.S. Patent 6,919,903. July 2005