Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1990-03-13
1993-02-23
Coles, Sr., Edward L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 78, 358401, 358403, H04N 146, H04N 100
Patent
active
051895102
ABSTRACT:
A process is provided for acquiring and digitally storing colored geographical maps having black portions. Each of a plurality of mutually adjacent maps is digitized by raster scanning so as to represent each map as a separate matrix of first pixels each encoded as a word having a predetermined number of bits and representing at least three fundamental colors of a respective one of said first pixels. The first pixels of each of said maps are classified by assigning each of them to one of a predetermined number of classes depending on their color. A mosaic is formed of mutually connected maps by re-sampling the mutually adjacent maps as second pixels and assigning, to each said second pixel, the code of that first pixel which is closest thereto. The mosaic is split into mutually identical blocks and a color file is formed for each block. A black-and-white file is formed for each block by storing, for each line in the block, black segments consisting of second pixels having a radiometric value lower than a predetermined threshold each in the form of the indication of the first pixel of the black segment.
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Proceedings of the Sid, vol. 14, No. 1973, Los Angeles US, pp. 18-25; P. J. Min: "Computer-aided mapping technology for geographic data base".
Proceedings of SPIE, Applications of Artificial Intelligence VI, Orlando, Fla., US, Apr.-4-6, 1988, vol. 937, 1988, SPIE, Washington, US pp. 402-410; R. L. Sandford et al.: "The application of knowledge base and digital image analysis techniques to automated map interpretation R. O. Duda et al.: Pattern classification and scene analysis " pp. 10-43, chapter 2, 1973, J. Wiley & Sons, New-York, U.S.
Henaff Yves
Le Roux Herve
Coles Sr. Edward L.
Lee Thomas D.
Matra Sep Imagerie et Informatique
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