Automatic document image revision

Details Automatic document image revision Automatic document image revision

1989-03-10

1991-05-28

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

358452, 382 61, 382 57, G06K 936

Patent

active

050201220

ABSTRACT:
A system for electronically storing revisions or modifications to documents which are already electronically stored in unrevised or unmodified form. The system compares, at the pixel-by-pixel level, a modified document bit map with a stored document bit map and determines from the differences between the two bit maps, at the pixel-by-pixel level, which differences are significant and which are insignificant. A revised document bit map is then formed from the portions of the stored-document bit map exhibiting no significant bit map differences and the significant differences bit map. The result is a revised document bit map in which no unnecessary changes have been introduced into the initial stored-document bit map. The system also includes steps for defining, on a pixel-by-pixel basis, a significant region bit map from the significant difference bit map and for forming the revised document bit map using the significant region bit map.

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Matsui et al., "High Speed Transmission of Sequential Freeze-Pictures by Extracting Charged Areas", IEEE Transaction, vol. Com-29, #12, pp. 1977-1981.
Don R. Searle, et al., "Experiences in Applying Digital Optical Technology to the Automation of Engineering Drawing Storage and Retrieval", 85-JPGC-PWE-60, Joint ASME/IEEE Power Generation Conference, Milwaukee, Wis., Oct. 20-24, 1981, pp. 1-8.
I. Sobel, "Neighborhood Coding of Binary Images for Fast Contour Following and General Binary Array Processing", Computer Graphics and Image Processing, vol. 8, 1978, pp. 127-233 (1978 Academic Press, Inc.).

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