Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1993-11-05
1994-11-08
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358447, 358518, H04N 140
Patent
active
053632095
ABSTRACT:
A method of altering the sharpness in the reproduction of an electronically encoded natural scene image, including process steps of: a) converting the signals to a luminance-chrominance signal format, wherein at least one signal represents overall image intensity; b) determining the maximum local contrast within the image; c) determining a filter function applicable to the image which increases maximum local contrast to a predetermined target value, and all other contrast to an amount proportional thereto; and d) applying the determined filter function to the image to increase sharpness thereof.
REFERENCES:
patent: 4745465 (1988-05-01), Kwon
patent: 5045952 (1991-09-01), Eschbach
patent: 5087972 (1992-02-01), Sumi
patent: 5134667 (1992-07-01), Suzuki
patent: 5247352 (1993-09-01), Nagler et al.
patent: 5285220 (1994-02-01), Suzuki et al.
R. C. Gonzales and B. A. Fittes, "Gray level transformation for interactive image enhancement," Proc. Second Conference on Remotely Manned Systems, 1975.
E. L. Hall, "Almost uniform distributions for computer image enhancement," IEEE Trans. Comput. C-23, 207-208, 1974.
W. K. Pratt, Digital Image Processing, Wiley, New York, 1978.
M. P. Ekstrom, Digital Image Processing Techniques, Academic Press, Orlando, 1984 (J.S. Lim).
J. C. Russ, The Image Processing Handbook, CRC Press Boca Raton, 1992.
R. C. Gonazalez and P. Wintz, "Image Enhancement by Histogram Modification Techniques", Digital Image Processing, Addison-Wesley Publishing, 1977, p. 118 et seq.
Pizer et al. "Adaptive Histogram Equalization and its Variations", Computer Vision, Graphics, and Image Processing, 39, 355-368 (1987), pp. 355-369.
"Xerox Color Encoding Standard," XNSS 289005, 1989.
Eschbach Reiner
Fuss William A.
Coles Sr. Edward L.
Costello Mark
Vu Kim Yen
Xerox Corporation
LandOfFree
Image-dependent sharpness enhancement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Image-dependent sharpness enhancement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image-dependent sharpness enhancement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1786923