Private method for inserting and detecting watermarks on raster vector maps, involves calculating parallel arrays from matrices, and resizing watermark according to size of original watermark to return extracted watermark

NOVELTY – The method involves inserting a watermark (R) in a marked vector map (M). Points (P) of the marked vector map are calculated. Q points of the vector-proof map are represented. The representations of the P and Q points are compared with each other by using a point pattern matching algorithm. Two matrices (Ax, Ay) are constructed from the P and Q points of the vector map. Other two matrices (Bx, By) are removed from the Q points. Parallel arrays are calculated from the matrices. A watermark is resized according to size of original watermark to return an extracted watermark. USE – Private method for inserting and detecting watermarks on raster vector maps. ADVANTAGE – The method ensures that vector maps are improving quality of control map by inserting raster images of the watermark. The method enables forming a water verification mark by using algorithms, so that authority and possession of raster images can be identified according to captured images. DETAILED DESCRIPTION – An INDEPENDENT CLAIM is also included for a semi-public method for detecting watermark on vector maps. DESCRIPTION OF DRAWING(S) – The drawing shows a flow diagram illustrating a private method for inserting and detecting watermarks on raster vector maps. Matrices (Ax, Bx, Ay, By) Real constant (C) Marked vector map (M) Points (P) Watermark (R)

Main Application Field

T01 (Digital Computers)

INVENTORS:

MARQUES DOUGLAS AURÉLIO
MAGALHÃES KARINA MOCHETTI DE
DAHAB RICARDO

395_MAPAS

Patent number: BR201012480-A2

PATENT STATUS:

For information contact Inova Unicamp

FOR ADDITIONAL INFORMATION:

parcerias@inova.unicamp.br

+55 (19) 3521-5207 / 2607