| 摘要 |
Methods ( 450, 750 ) are disclosed for embedding a watermark into an image ( 400, 700 ). The watermark comprises at least one basis pattern. A real part of the basis pattern(s) ( 410, 710 ) is added to the image ( 400, 700 ) to form a watermarked image ( 420, 730 ). The basis pattern(s) has scale and rotation invariant properties. The pattern(s) is preferably added to the image at a low intensity to make the pattern(s) invisible or imperceptible to the human visual system under normal viewing conditions. Methods ( 800, 900 ) are also disclosed for detecting a watermark from a watermarked image ( 810, 910 ). The watermark image ( 810, 910 ) is correlated with the basis pattern to provide a result image ( 830, 950 ). Peaks in the result image ( 830, 950 ) correspond with positions where the basis pattern was detected in the watermarked image ( 830, 950 )
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