DATA HIDING OF BINARY IMAGE USING DISCRETE WAVELETTRANSFORMATION

[摘要] Watermarking is a technique of hiding information in image including scanned text, figures, and signatures in such a way that it is difficult to intercept. In this paper, we proposed a digital image watermarking algorithm based on wavelet transform. Arnold transform and human visual characteristics is used to scramble the original watermark. In the embedding process two sub-bands which are in the same direction but in different resolution are selected when the carrier image is decomposed by two-layer wavelet transform. In the process of watermark extraction, the watermarks are detected by using the embedded position and scaling parameter a after the wavelet decomposition of the watermarked image and the original image.

[关键词] Digital watermark;discrete wavelet Transform;arnold transform;image processing