Image analysis – Pattern recognition – Classification
Patent
1997-08-11
1999-07-27
Shalwala, Bipin H.
Image analysis
Pattern recognition
Classification
382170, 382177, 382191, 382227, 382218, G06K 962, G06K 934, G06K 900, G06K 946
Patent
active
059303930
ABSTRACT:
A technique for the enhancement of degraded document images to improve their display quality characteristics and image recognition accuracy. Images believed to be representative of the same symbol which occur in different positions over a image source (e.g., a facsimile page) are clustered together. Using the symbols within a particular cluster, an average character image outline for that cluster of symbols is derived and thereafter used to refine the matching of symbols within the cluster and to determine a final representative symbol for that cluster. The final representative symbols from the various resulting clusters are then used to replace all matching images throughout the image source. Advantageously, the display quality and recognition accuracy of the image source is enhanced after application of the present invention due to the resulting improvement of the images in the image source.
REFERENCES:
patent: 5315668 (1994-05-01), O'Hair
patent: 5524065 (1996-06-01), Yagasaki
patent: 5550931 (1996-08-01), Bellegarda et al.
patent: 5577135 (1996-11-01), Grajski et al.
patent: 5657397 (1997-08-01), Bokser
patent: 5757964 (1998-05-01), Lee et al.
patent: 5764799 (1998-06-01), Hong et al.
patent: 5818952 (1998-10-01), Takenouchi et al.
patent: 5818965 (1998-10-01), Davies
patent: 5822465 (1998-10-01), Normile et al.
patent: 5825925 (1998-10-01), Baird et al.
H. S. Baird, "Anatomy of a Versatile Page Reader," Proceedings of the IEEE, 80(7), 1059-1065 (Jul. 1992), Special Issue on OCR.
L. Guibas et al., "A Kinetic Framework for Computational Geometry," in Proc. of the 24th Annual Symp. on Foundations of Computer Science, 100-111 (1983).
T. K. Ho, "Random Decision Forests," in Proceedings of the 3rd International Conference on Document Analysis and Recognition, 278-282 (Aug. 1995), Montreal, Canada.
T. K. Ho et al., "Perfect Metrics," in Proceedings of the Second International Conference on Document Analysis and Recognition, 593-597 (Oct. 1993), Tsukuba Science City, Japan.
J. D. Hobby, "Smoothing Digitized Contours," in R. A. Earnshaw, Editor, Theoretical Foundations of Computer Graphics and CAD, 777-793, Springer Verlag (1988).
J. D. Hobby et al., "Degraded Character Image Restoration," in Proceedings of the Fifth Annual Symposium on Document Analysis and Image Retrieval, 233-245 (1996).
D. J. Ittner et al., "Language-free Layout Analysis," in Proceedings of the Second International Conference on Document Analysis and Recognition, 336-340 (1993), Tsukuba Science City, Japan.
S. Mori et al., "Research on Machine Recognition of Handprinted Characters," IEEE Transactions on Pattern Analysis and Machine Intelligence, PAMI-6(4), 386-405 (Jul. 1984).
J. A. Nelder et al., "A Simplex Method for Function Minimization," Computer Journal, 7, 308-313 (1965).
S. V. Rice et al., "An Evaluation of OCR Accuracy," in Information Science Research Institute, 1993 Annual Research Report, 9-20 (1993), University of Nevada, Las Vegas.
Q. Zhang et al., "Bitmap Reconstruction for Document Image Compression," in International Symposium on Voice, Video and Data Communications (1996).
W. H. Press et al., "Numerical Recipes in C, The Art of Scientific Computing," Cambridge University Press, second edition, pp. 345-346, 1992.
Ho Tin Kam
Hobby John D.
Dinella Donald P.
Lucent Technologies - Inc.
Shalwala Bipin H.
LandOfFree
Method and apparatus for enhancing degraded document images does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for enhancing degraded document images, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for enhancing degraded document images will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-888774