Automatic document image revision

Details Automatic document image revision Automatic document image revision

1987-07-20

1989-05-02

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

382 57, H04N 140

Patent

active

048273309

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.

REFERENCES:
patent: 4121196 (1978-10-01), Johnson et al.
patent: 4249212 (1981-02-01), Ito et al.
patent: 4633506 (1986-12-01), Kato
Matsui et al., "High-Speed Transmission of Sequential Freeze-Pictures by Extracting Charged Areas", IEEE Transactions, 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 WI Oct. 20-24, 1985 (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. 127-235 (1978 Academic Press, Inc.).

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