Method and apparatus for vectorizing documents and for...

Details Method and apparatus for vectorizing documents and for... Method and apparatus for vectorizing documents and for...

G - Physics

06

K

350/7, 354/72

G06K 9/58 (2006.01) H04N 1/41 (2006.01)

Patent

CA 1256214

Abstract An apparatus codes a scanned document locally representing each graphic element within a prescribed measure of accuracy by a trapezoidal approximation. The invention also includes a method for similarly coding a scanned document. The apparatus determines whether each scanned run is indicative of a .gamma.- or .lambda. -junction, the termination of an old, or the commencement of a new graphic element, and whether a new linear approximation is necessary. The invention in a preferred embodiment recognizes symbols by determining the center of mass and maximum extremity of a symbol candidate, and comparing it to a reference library after normalizing with respect to scale, orientation and center of mass. In a preferred embodiment, an adaptive threshold parameter governs coding so as to reject noise and optimize a pair of linear predicters in a small number of scans. In a further preferred embodiment the accuracy of the linear predicters is refined so that the error is exponentially bounded.

451901

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