Abstract
In order to protect the copyright of digital maps, a curve-based watermarking technique for fingerprinting digital maps was proposed. First the embeddable sample points were selected according to their curvatures, and then the spread spectrum based watermark sequence (also called fingerprint sequence) was embedded into the coordinates of the embeddable sample points. To achieve high quality watermarked curve and robust watermark, the Bezier segments were used to reconstruct the watermarked curve. Our watermarked curve suffers smaller embedding distortions and is robust against common geometrical distortions (e.g., translation, rotation, and scaling), collusions, and printing-scaling attacks.
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