Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Patent
1994-08-15
1996-06-04
Boudreau, Leo
Image analysis
Image enhancement or restoration
Intensity, brightness, contrast, or shading correction
382272, 382263, G06K 940
Patent
active
055240704
ABSTRACT:
In a mail sorting system 10, output pixel intensities of an optical scanner 18 have their contrast locally enhanced. A contrast enhancer 24 uses statistical methods (averaging, standard deviation) coupled with empirical stretch and offset data stored in a ROM 25, to enhance pixel contrast in a pipelined processing operation.
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M. Vaezi et al., "Contrast-Dependent Spread Filters", SPIE vol. 1244 Image Processing Algorithms and Techniques (1990), pp. 100-107.
A. R. Ganesan et al., "Simple Image Processing Techniques for the Contrast Enhancement of Real-time Digital Speckle Pattern Interfermetry Fringes", Optical Engineering, Sep. 1989, vol. 28, No. 9, pp. 1019-1022.
Brhram Javidi, et al., "Image Enhancement by Nonlinear Signal Processing", Applied Optics, vol. 29, No. 32, Nov. 1990, pp. 4812-4818.
Jorge L. C. Sanz et al., "Note on Contrast Measures and Polynomial Classifiers", Proceedings of the IEEE, vol. 76, No. 3, Mar. 1988, pp. 294-296.
J. M. White, et al., "Image Thresholding for Optical Character Recognition and Other Applications Requiring Character Image Extraction", IBM J. Res. Develop., vol. 27, No. 4, Jul. 1983, pp. 400-411.
Paul W. Palumbo et al., "Document Image Binarization: Evaluation of Algorithms", Application of Digital Image Processing IX, SPIE vol. 697 (1986).
H. B. Barlow et al., "Human Contrast Discrimination and the Threshold of Cortical Neurons", J. Opt. Soc. Am. A, vol. 4, No. 12, pp.2366-2371, Dec. 1987.
M. Vaezi et al., "Contrast-Dependent Spread Filters", SPIE vol. 1244 Image Processing Algorithms and Techniques (1990), pp. 100-107.
A. R. Ganesan et al., "Simple Image Processing Techniques for the Contrast Enhancement of Real-time Digital Speckle Pattern Interfermetry Fringes", Optical Engineering, Sep. 1989, vol. 28, No. 9, pp. 1019-1022.
Brhram Javidi, et al., "Image Enhancement by Nonlinear Signal Processing", Applied Optics, vol. 29, No. 32, Nov. 1990, pp. 4812-4818.
Jorge L. C. Sanz et al., "Note on Contrast Measures and Polynomial Classifiers", Proceedings of the IEEE vol. 76, No. 3, Mar. 1988, pp. 294-296.
J. M. White, et al., "Image Thresholding for Optical Character Recognition and Other Applications Requiring Character Image Extraction", IBM J. Res. Develop., vol. 27, No. 4, Jul. 1983, pp. 400-411.
Demjanenko Victor
Shin Yong-Chul
Sridhar Ramalingam
Srihari Sargur N.
Anderson David R.
Boudreau Leo
The Research Foundation of State University of New York
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