Image analysis – Image segmentation
Patent
1998-09-23
2000-10-03
Tran, Phuoc
Image analysis
Image segmentation
382224, G06K 934
Patent
active
061284084
ABSTRACT:
A method and apparatus are disclosed which analyze the video surrounding a pixel being classified and augment a calculated absolute value of the sum of the laplacians Sij just enough to enable reliable document type detection based on the other microclassifiers. The augmentation in effect removes Sij's contribution to the document-type decision to an extent which varies with the video. Where the Sij calculation is expected to be robust, augmentation is small and Sij remains a factor. Where the Sij calculation is weak, augmentation is larger and the other microclassifiers used for halftone detection dominate the classification decision. The method generally includes the steps of determining an Sij value for the pixel being classified, determining an estimated substrate reflectance value, determining an estimated ink reflectance value, determining a local average video value, and augmenting the Sij value based on the lesser of 1) a difference between the substrate reflectance value and the local average video value, and 2) a difference between the ink reflectance value and the local average video value.
REFERENCES:
patent: 5073953 (1991-12-01), Westdijk
patent: 5293430 (1994-03-01), Shiau et al.
patent: 5339172 (1994-08-01), Robinson
patent: 5987221 (1999-11-01), Bearss et al.
Tran Phuoc
Xerox Corporation
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