Facsimile and static presentation processing – Natural color facsimile – Color correction
Patent
1993-10-07
1995-05-09
Coles, Sr., Edward L.
Facsimile and static presentation processing
Natural color facsimile
Color correction
358520, H04N 146
Patent
active
054145384
ABSTRACT:
A method of altering the exposure in the reproduction of an electronically encoded natural scene image, including process steps of a) receiving an electronically encoded natural scene image, where the encoding is in terms of red-green-blue signals; b) converting the signals to a luminance-chrominance signal format, wherein at least one signal represents overall image intensity; c) comparing the intensity signal to a pair of preset threshold signals T.sub.light, T.sub.dark, respectively indicating satisfactory brightness and darkness of the image and producing a multi-state signal responsive to the comparison; d) if the signal state indicates that both thresholds are exceeded, or that neither threshold is exceeded, directing the electronically encoded image without alteration to further processing; e) if the signal state indicates that one of the pair of preset thresholds is exceeded, the original electronically encoded signal is processed in accordance with the equation:
REFERENCES:
patent: 4908701 (1990-03-01), Udagawa
patent: 5187570 (1993-02-01), Hiber et al.
patent: 5237402 (1993-08-01), Deshon et al.
patent: 5347374 (1994-09-01), Fuss 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. Gonzalez 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.
Coles Sr. Edward L.
Costello Mark
Vu Kim Yen
Xerox Corporation
LandOfFree
Image-dependent exposure 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 exposure enhancement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image-dependent exposure enhancement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1710148