Image analysis – Image enhancement or restoration
Patent
1997-09-16
1999-12-21
Couso, Jose L.
Image analysis
Image enhancement or restoration
G06K 940
Patent
active
060059834
ABSTRACT:
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 enhanced map having spatial frequencies exceeding an initial maximum spatial frequency of the input image. The enhanced map is generated by applying a non-linear operator to the edge map in a manner which preserves the phase transitions of the edges of the input image. The enhanced map is added to the input image to achieve a resulting image having spatial frequencies greater than those in the input image. Simplicity of computations and ease of implementation allow for image sharpening after enlargement and for real-time applications such as videophones, advanced definition television, zooming, and restoration of old motion pictures.
REFERENCES:
patent: 4399461 (1983-08-01), Powell
patent: 4523230 (1985-06-01), Carlson et al.
patent: 4661986 (1987-04-01), Adelson
patent: 4674125 (1987-06-01), Carlson et al.
patent: 4692806 (1987-09-01), Anderson et al.
patent: 4698843 (1987-10-01), Burt et al.
patent: 4709394 (1987-11-01), Bessler et al.
patent: 4718104 (1988-01-01), Anderson
patent: 4736448 (1988-04-01), Umemura
patent: 4797942 (1989-01-01), Burt
patent: 4987480 (1991-01-01), Lippman et al.
patent: 5029227 (1991-07-01), Kawamura
patent: 5179441 (1993-01-01), Anderson et al.
patent: 5231677 (1993-07-01), Mita et al.
patent: 5276513 (1994-01-01), Van der Wal et al.
patent: 5526446 (1996-06-01), Adelson et al.
patent: 5717789 (1998-02-01), Anderson et al.
"Digital Image Processing", Rafael C. Gonzalez et al., Addison Wesley (1992).
"A New Class of Nonlinear Filters for Image Enhancement", Sanjit K. Mitra et al., IEEE 1991, Signal and Image Processing Laboratory, Department of Electrical and Computer Engineering, University of California, Santa Barbara.
"Electronic Circuits, signals, and Systems", Samuel J. Mason et al., John Wiley & Sons, Inc. (1960), pp. 503-505.
Anderson Charles H.
Greenspan Hayit K.
California Institutue of Technology
Couso Jose L.
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