1
Charles H Anderson, Hayit K Greenspan: Image enhancement by non-linear extrapolation in frequency space. California Institute of Technology, Blakely Sokoloff Taylor & Zafman, February 10, 1998: US05717789 (83 worldwide citation)

An input image is enhanced to include spatial frequency components having frequencies higher than those in an input image. To this end, an edge map is generated from the input image using a high band pass filtering technique. An enhancing map is subsequently generated from the edge map, with the enh ...


2
Charles H Anderson, Hayit K Greenspan: Image enhancement by non-linear extrapolation in frequency space. California Institutue of Technology, Blakely Sokoloff Taylor & Zafman, December 21, 1999: US06005983 (33 worldwide citation)

An input image is enhanced to include spatial frequency components having frequencies higher than those in an input image. To this end, an edge map is generated from the input image using a high band pass filtering technique. An enhancing map is subsequently generated from the edge map, with the enh ...